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+---
+name: ln-115-presentation-creator
+description: Builds interactive HTML presentation with 6 tabs (Overview, Requirements, Architecture/C4, Tech Spec, Roadmap, Guides). Creates presentation/README.md hub. Worker under ln-110-documents-pipeline.
+---
+
+# HTML Presentation Builder
+
+This skill creates an interactive, self-contained HTML presentation from existing project documentation. It transforms Markdown documents into a professional, navigable web presentation with diagrams, collapsible sections, and modern UI.
+
+## When to Use This Skill
+
+**This skill is a WORKER** invoked by **ln-110-documents-pipeline** orchestrator OR used standalone.
+
+Use this skill when:
+- Building HTML presentation from existing documentation
+- Rebuilding presentation after documentation updates
+- Creating standalone presentation for sharing (no full documentation setup needed)
+- Validating that source documentation is ready for presentation generation
+
+**Part of workflow**: ln-110-documents-pipeline → ln-111-root-docs-creator → ln-112-reference-docs-creator → ln-113-tasks-docs-creator → ln-114-project-docs-creator → **ln-115-presentation-creator**
+
+**Prerequisites**: Existing documentation in `docs/` directory with **required files**:
+- `docs/project/requirements.md` (REQUIRED)
+- `docs/project/architecture.md` (REQUIRED)
+- `docs/project/tech_stack.md` (REQUIRED)
+
+**Optional files** (enhance presentation but not blocking):
+- `docs/project/api_spec.md`, `database_schema.md`, `design_guidelines.md`, `runbook.md`
+- `docs/reference/adrs/*.md` (ADRs with Category: Strategic|Technical)
+- `docs/reference/guides/*.md` (How-to guides)
+- `docs/tasks/kanban_board.md` (Epic Story Counters for Roadmap)
+
+## How It Works
+
+The skill follows a **7-phase workflow**: READ DOCS → VALIDATE SOURCE EXISTS → VALIDATE SOURCE QUALITY → CREATE DIR → COPY TEMPLATES → INJECT CONTENT → BUILD HTML.
+
+**Phase 1: READ DOCS** - Load all project documentation from docs/
+**Phase 2: VALIDATE SOURCE EXISTS** - Check required files exist (requirements.md, architecture.md, tech_stack.md), warn if optional missing
+**Phase 3: VALIDATE SOURCE QUALITY** - Check diagrams, placeholders, content length (read-only validation)
+**Phase 4: CREATE DIR** - Create presentation/ directory + README.md navigation hub
+**Phase 5: COPY TEMPLATES** - Copy HTML/CSS/JS templates to assets/
+**Phase 6: INJECT CONTENT** - Parse MD docs → replace placeholders in tab files → delete example blocks
+**Phase 7: BUILD HTML** - Assemble modular components into standalone presentation_final.html
+
+---
+
+## Phase 1: Read Documentation
+
+**Objective**: Load all project documentation for transformation.
+
+**When to execute**: Always (first phase)
+
+**Process**:
+
+1. **Use docs/ as source**:
+   - Read documentation from `docs/project/`, `docs/reference/`, `docs/tasks/` directories
+   - Standard locations created by ln-114, ln-112, ln-113
+
+2. **Read Core MD Documents**:
+   - `project/requirements.md` - Functional Requirements
+   - `project/architecture.md` - Architecture design, C4 diagrams
+   - `project/tech_stack.md` - Technology versions, Docker configuration
+   - `project/api_spec.md` - API endpoints, authentication (if exists)
+   - `project/database_schema.md` - Database schema, ER diagrams (if exists)
+   - `project/design_guidelines.md` - UI/UX design system (if exists)
+   - `project/runbook.md` - Operational procedures (if exists)
+
+3. **Read ADRs** (if exist):
+   - `reference/adrs/adr-001-*.md` through `adr-NNN-*.md`
+   - Parse ADR metadata (status, date, title, Category: Strategic|Technical)
+
+4. **Read Guides** (if exist):
+   - `reference/guides/*.md` - How-to guides for Guides tab
+
+5. **Read Kanban Board** (if exists):
+   - `tasks/kanban_board.md` - Epic Story Counters table for Roadmap progress
+
+6. **Extract metadata**:
+   - Project name, date, version from documents
+   - Preserve Mermaid diagram blocks
+
+**Output**: Loaded documentation data ready for validation and HTML generation
+
+---
+
+## Phase 2: Validate Source Documentation Exists
+
+**Objective**: Verify that required source documentation exists before building presentation. Prevent building incomplete presentations.
+
+**When to execute**: After Phase 1 (documentation loaded)
+
+**Process**:
+
+### 2.1 Check required files
+
+**REQUIRED** (must exist - block execution if missing):
+- ✅ `docs/project/requirements.md`
+- ✅ `docs/project/architecture.md`
+- ✅ `docs/project/tech_stack.md`
+
+For each required file:
+1. Use Glob tool: `pattern: "docs/project/{filename}"`
+2. If NOT found:
+   - Add to missing list
+3. If found:
+   - Check file size > 100 bytes (not empty)
+
+**If ANY required file missing or empty:**
+```
+❌ ERROR: Cannot build presentation - missing required documentation:
+  - docs/project/requirements.md [missing/empty]
+  - docs/project/architecture.md [missing/empty]
+
+Suggestion: Run ln-114-project-docs-creator to create missing files.
+
+STOP execution.
+```
+
+### 2.2 Check optional files
+
+**OPTIONAL** (enhance presentation - warn if missing but continue):
+- ⚠️ `docs/project/api_spec.md` (for backend projects)
+- ⚠️ `docs/project/database_schema.md` (for projects with database)
+- ⚠️ `docs/project/design_guidelines.md` (for frontend projects)
+- ⚠️ `docs/project/runbook.md` (for operational projects)
+
+For each optional file:
+1. Use Glob tool: `pattern: "docs/project/{filename}"`
+2. If NOT found:
+   - Add to optional missing list
+
+**If optional files missing:**
+```
+⚠ WARN: Optional files missing: [list]
+Presentation will have reduced content in some tabs.
+Continue execution.
+```
+
+### 2.3 Check optional directories
+
+**OPTIONAL directories:**
+- `docs/reference/adrs/` - check if any ADR files exist (`adrs/*.md`)
+- `docs/reference/guides/` - check if any guide files exist (`guides/*.md`)
+- `docs/tasks/kanban_board.md` - check for Roadmap data
+
+For each directory:
+1. Use Glob tool to find files
+2. If empty/missing:
+   - Log: `ℹ Optional directory empty: {directory} - related tab will show placeholder`
+
+### 2.4 Report validation summary
+
+Log summary:
+```
+✓ Source documentation validation completed:
+  Required files:
+    - ✅ requirements.md (found, 8.5 KB)
+    - ✅ architecture.md (found, 15.2 KB)
+    - ✅ tech_stack.md (found, 3.1 KB)
+  Optional files:
+    - ⚠️ api_spec.md (missing - Technical Spec tab will have reduced content)
+    - ✅ database_schema.md (found, 4.7 KB)
+    - ⚠️ design_guidelines.md (missing)
+  Optional directories:
+    - ✅ adrs/ (5 ADR files found)
+    - ⚠️ guides/ (empty - Guides tab will show placeholder)
+    - ✅ kanban_board.md (found - Roadmap will show progress)
+```
+
+**Output**: Validation passed (all required files exist) OR error (stop execution)
+
+---
+
+## Phase 3: Validate Source Content Quality
+
+**Objective**: Verify that source docs contain sufficient content for presentation generation. Warn about incomplete content but don't block execution.
+
+**When to execute**: After Phase 2 (source files exist)
+
+**Process**:
+
+### 3.1 Check for Mermaid diagrams
+
+**Required diagrams:**
+- `architecture.md` MUST have at least 1 Mermaid diagram (preferably C4 Context)
+- `database_schema.md` (if exists) MUST have ER diagram
+
+For each file:
+1. Read file content
+2. Search for Mermaid code blocks: ` ```mermaid`
+3. Count diagrams
+
+**If diagrams missing:**
+```
+⚠ WARN: Missing diagrams in architecture.md
+  Expected: At least 1 Mermaid diagram (C4 Context, Container, or Component)
+  Found: 0 diagrams
+
+  Presentation Architecture tab will have incomplete visualization.
+  Suggestion: Add C4 diagrams to architecture.md before building.
+```
+
+### 3.2 Check for placeholders
+
+**Placeholder patterns to detect:**
+- `{{PLACEHOLDER}}` (template placeholder)
+- `[Add your ...]` (instruction placeholder)
+- `TODO:` (incomplete content marker)
+
+For each source file:
+1. Read file content
+2. Search for placeholder patterns (case-insensitive)
+3. Collect matches with line numbers
+
+**If placeholders found:**
+```
+⚠ WARN: Source docs contain placeholders:
+  - requirements.md:42 - {{PROJECT_DESCRIPTION}}
+  - tech_stack.md:15 - [Add your technology rationale]
+  - api_spec.md:8 - TODO: Add authentication endpoints
+
+  Presentation will show incomplete content.
+  Suggestion: Complete placeholders before building for professional result.
+```
+
+### 3.3 Check content length
+
+**Minimum expected lengths:**
+- `requirements.md` > 500 words
+- `architecture.md` > 1000 words
+- `tech_stack.md` > 200 words
+
+For each file:
+1. Read file content
+2. Count words (split by whitespace, exclude code blocks)
+3. Compare to threshold
+
+**If content too short:**
+```
+⚠ WARN: Sparse content detected:
+  - requirements.md: 320 words (expected >500)
+  - tech_stack.md: 150 words (expected >200)
+
+  Presentation may look incomplete with thin content.
+  Suggestion: Expand documentation before building.
+```
+
+### 3.4 Auto-fix opportunities
+
+**None** - ln-115 is **read-only** for source docs:
+- ❌ Does NOT edit markdown documentation
+- ✅ Only READS and TRANSFORMS to HTML
+
+**If issues found:**
+```
+💡 To fix content issues:
+  - Run ln-114-project-docs-creator to complete documentation
+  - Manually edit source files in docs/project/
+  - Re-run ln-115-presentation-creator after fixes
+```
+
+### 3.5 Report content quality summary
+
+Log summary:
+```
+✓ Content quality validation completed:
+  Diagrams:
+    - ✅ architecture.md: 3 Mermaid diagrams found (C4 Context, Container, Component)
+    - ⚠️ database_schema.md: No ER diagram found
+  Placeholders:
+    - ⚠️ Found 2 placeholders in 2 files (see details above)
+  Content length:
+    - ✅ requirements.md: 1,250 words
+    - ✅ architecture.md: 2,100 words
+    - ⚠️ tech_stack.md: 180 words (expected >200)
+
+  Warnings: 3 (non-blocking)
+  Recommendation: Address warnings for professional result, or continue with current content.
+```
+
+**Output**: Content quality report (warnings only, does not block execution)
+
+---
+
+## Phase 4: Create Presentation Directory & README
+
+**Objective**: Setup presentation directory structure and navigation hub.
+
+**When to execute**: After Phase 3 (source validation complete, warnings logged)
+
+**Process**:
+
+1. **Create presentation directory**:
+   ```bash
+   mkdir -p docs/presentation/
+   ```
+
+2. **Check if presentation/README.md exists**:
+   - Use Glob tool: `pattern: "docs/presentation/README.md"`
+   - If file exists:
+     - Skip creation
+     - Log: `✓ docs/presentation/README.md already exists (preserved)`
+     - Proceed to Phase 5
+   - If NOT exists:
+     - Continue to step 3
+
+3. **Create presentation/README.md from template**:
+   - Copy template: `references/presentation_readme_template.md` → `docs/presentation/README.md`
+   - Replace placeholders:
+     - `{{PROJECT_NAME}}` — from requirements.md
+     - `{{LAST_UPDATED}}` — current date (YYYY-MM-DD)
+   - Content structure:
+     - **Purpose**: What is this presentation
+     - **Quick Navigation**: Links to presentation_final.html and assets/
+     - **Customization Guide**: How to edit source files in assets/
+     - **Build Instructions**: How to rebuild after changes
+     - **Maintenance**: When to rebuild, verification checklist
+
+4. **Notify user**:
+   - If created: `✓ Created docs/presentation/README.md (navigation hub)`
+   - If skipped: `✓ docs/presentation/README.md already exists (preserved)`
+
+**Output**: docs/presentation/README.md (created or existing)
+
+---
+
+## Phase 5: Copy Templates to Project
+
+**Objective**: Copy HTML/CSS/JS templates from skill references/ to presentation directory.
+
+**When to execute**: After Phase 4 (presentation directory exists)
+
+**Process**:
+
+1. **Check if assets exist**:
+   - Use Glob tool: `pattern: "docs/presentation/assets/"`
+   - If `docs/presentation/assets/` exists:
+     - Skip copying (user may have customized files)
+     - Log: `✓ Presentation assets already exist - preserving user customizations`
+     - Proceed to Phase 6
+   - If NOT exists:
+     - Continue to step 2
+
+2. **Copy template files**:
+   ```bash
+   cp references/presentation_template.html → docs/presentation/assets/
+   cp references/styles.css → docs/presentation/assets/
+   cp references/scripts.js → docs/presentation/assets/
+   cp references/build-presentation.js → docs/presentation/assets/
+   cp -r references/tabs/ → docs/presentation/assets/tabs/
+   ```
+
+3. **Verify copied structure**:
+   ```
+   docs/presentation/assets/
+   ├── presentation_template.html   # Base HTML5 + 6 tab navigation
+   ├── styles.css                    # ~400-500 lines
+   ├── scripts.js                    # Tab switching + Mermaid init
+   ├── build-presentation.js         # Node.js build script
+   └── tabs/
+       ├── tab_overview.html         # Landing page
+       ├── tab_requirements.html     # FRs + ADRs
+       ├── tab_architecture.html     # C4 diagrams
+       ├── tab_technical_spec.html   # API + Data + Deployment
+       ├── tab_roadmap.html          # Epic list
+       └── tab_guides.html           # How-to guides
+   ```
+
+**Output**: Template files copied to docs/presentation/assets/ (or skipped if already exist)
+
+**Note**: Templates contain placeholders (`{{VARIABLE_NAME}}`) that will be replaced in Phase 6.
+
+---
+
+## Phase 6: Content Injection & Example Cleanup
+
+**Objective**: Parse MD documentation, inject into HTML templates, and remove example blocks to create project-specific presentation.
+
+**When to execute**: After Phase 5 (templates exist in assets/)
+
+**Process**:
+
+### 6.1 Read and Parse MD Documents
+
+Read and parse the following documentation files (from Phase 1):
+
+1. **requirements.md**: Project name, tagline, business goal, functional requirements, constraints, success criteria
+2. **architecture.md**: Architecture diagrams (C4 Context/Container/Component), solution strategy, quality attributes
+3. **tech_stack.md**: Technology Stack table (with versions, rationale, ADR links), Docker configuration
+4. **api_spec.md** (if exists): API endpoints, authentication methods, error codes
+5. **database_schema.md** (if exists): ER diagrams, data dictionary (tables/columns/types)
+6. **design_guidelines.md** (if exists): Typography, colors, component library, accessibility
+7. **runbook.md** (if exists): Development setup, deployment procedures, troubleshooting
+8. **adrs/*.md**: All ADR files (parse title, status, category, content)
+9. **kanban_board.md** (if exists): Epic Story Counters table for Roadmap progress
+10. **guides/*.md** (if exist): How-to guides for Guides tab
+
+### 6.2 Inject Content into Templates
+
+Replace placeholders in copied template files with parsed content from project documentation.
+
+**Key Placeholders (in tab templates):**
+
+**Overview Tab** (`tab_overview.html`):
+- `{{PROJECT_SUMMARY}}` — Problem/Solution/Business Value structure (3 sections)
+- `{{TECH_STACK}}` — Technology badges (brief list only)
+- `{{STAKEHOLDERS}}` — Stakeholder cards with names and roles
+- `{{QUICK_FACTS}}` — Project Status, Total Epics, Deployment Model, Target Platforms
+- `{{NAVIGATION_GUIDE}}` — Documentation guide with tab descriptions
+
+**Requirements Tab** (`tab_requirements.html`):
+- `{{FUNCTIONAL_REQUIREMENTS}}` — FRs table (ID, Priority, Requirement, Acceptance Criteria)
+- `{{ADR_STRATEGIC}}` — Strategic ADRs grouped section with accordion
+- `{{ADR_TECHNICAL}}` — Technical ADRs grouped section with accordion
+- `{{SUCCESS_CRITERIA}}` — Project success metrics
+- **Non-Functional Requirements are banned**: Drop any NFR content found in source docs instead of converting it into tables or IDs
+
+**Architecture Tab** (`tab_architecture.html`):
+- `{{C4_CONTEXT}}` — System Context diagram (C4 Level 1)
+- `{{C4_CONTAINER}}` — Container diagram (C4 Level 2)
+- `{{C4_COMPONENT}}` — Component diagram (C4 Level 3)
+- `{{DEPLOYMENT_DIAGRAM}}` — Infrastructure deployment diagram
+- `{{ARCHITECTURE_NOTES}}` — Key architecture highlights table
+
+**Technical Spec Tab** (`tab_technical_spec.html`):
+- `{{TECH_STACK_TABLE}}` — Full technology stack table with versions and purposes
+- `{{API_ENDPOINTS}}` — API endpoints tables (Authentication, Products, Cart, etc.)
+- `{{DATA_MODELS}}` — ER diagram + Data dictionary table
+- `{{TESTING_STRATEGY}}` — Risk-Based Testing approach and test pyramid
+
+**Roadmap Tab** (`tab_roadmap.html`):
+- `{{EPIC_CARDS}}` — All Epic cards with In/Out Scope, Dependencies, Success Criteria, Progress
+- `{{OUT_OF_SCOPE_ITEMS}}` — Project-level out-of-scope items with reasons
+- `{{ROADMAP_LEGEND}}` — Status badges explanation
+
+**Guides Tab** (`tab_guides.html`):
+- `{{GETTING_STARTED}}` — Prerequisites, Installation, Verification
+- `{{HOW_TO_GUIDES}}` — Step-by-step how-to guides (from guides/*.md)
+- `{{BEST_PRACTICES}}` — Code style, Testing approach, Design patterns
+- `{{TROUBLESHOOTING}}` — Common problems and solutions
+- `{{CONTRIBUTING}}` — Contributing guidelines
+- `{{EXTERNAL_RESOURCES}}` — Links to external documentation
+
+**Placeholder Replacement Logic:**
+- Use **Edit** tool to replace `{{PLACEHOLDER}}` → actual content from project docs
+- For lists/arrays: generate HTML dynamically (e.g., loop through ADRs, create `<details>` elements)
+- For Kanban: parse kanban_board.md → calculate progress % → generate Epic card HTML
+- Preserve SCOPE tags in tab files (HTML comments at top)
+- Escape special characters to prevent XSS
+- Generate valid Mermaid syntax
+
+### 6.3 Delete Example Blocks
+
+**CRITICAL**: Remove all example content blocks to create project-specific presentation.
+
+**Process**:
+1. **Search for example markers** in all 6 tab files:
+   - Look for `<!-- EXAMPLE START: Remove this block after replacing placeholder -->`
+   - Look for `<!-- EXAMPLE END -->`
+
+2. **Delete example blocks** using Edit tool:
+   - Remove everything between `<!-- EXAMPLE START -->` and `<!-- EXAMPLE END -->` (inclusive)
+   - Do this for ALL occurrences across all 6 tab files
+   - Leave only the actual project content that replaced `{{PLACEHOLDER}}` comments
+
+3. **Validate cleanup**:
+   - ✅ NO `<!-- EXAMPLE START -->` markers should remain
+   - ✅ NO `<!-- EXAMPLE END -->` markers should remain
+   - ✅ NO hardcoded e-commerce examples (John Smith, React 18 badges, Stripe, etc.)
+   - ✅ Only actual project data should be visible in tab files
+
+**Example transformation:**
+
+**Before (dual-content template):**
+```html
+<!-- PLACEHOLDER: {{PROJECT_SUMMARY}} -->
+<!-- EXAMPLE START: Remove this block after replacing placeholder -->
+<div class="project-summary">
+    <h3>The Problem</h3>
+    <p>Traditional e-commerce platforms struggle...</p>
+</div>
+<!-- EXAMPLE END -->
+```
+
+**After Step 6.2 (placeholder replaced):**
+```html
+<div class="project-summary">
+    <h3>The Problem</h3>
+    <p>Our healthcare system needs unified patient records...</p>
+</div>
+<!-- EXAMPLE START: Remove this block after replacing placeholder -->
+<div class="project-summary">
+    <h3>The Problem</h3>
+    <p>Traditional e-commerce platforms struggle...</p>
+</div>
+<!-- EXAMPLE END -->
+```
+
+**After Step 6.3 (examples deleted):**
+```html
+<div class="project-summary">
+    <h3>The Problem</h3>
+    <p>Our healthcare system needs unified patient records...</p>
+</div>
+```
+
+**Output**: Clean, project-specific tab files with NO example content, ready for build
+
+---
+
+## Phase 7: Build Final Presentation
+
+**Objective**: Assemble modular components into standalone HTML file.
+
+**When to execute**: After Phase 6 (content injected, examples deleted)
+
+**Process**:
+
+1. **Check if presentation_final.html exists (Auto-rebuild for automation)**:
+   - Use Glob tool: `pattern: "docs/presentation/presentation_final.html"`
+   - If file exists:
+     - **✓ Auto-rebuild** (generated file, safe operation)
+     - Log: `ℹ Rebuilding presentation_final.html (generated file, safe to rebuild)`
+     - Continue to step 2
+   - If NOT exists:
+     - Log: `Creating presentation_final.html`
+     - Continue to step 2
+
+   **Why auto-rebuild:**
+   - presentation_final.html is a **generated file** (source of truth: assets/ directory)
+   - Rebuilding is safe - no data loss (source files preserved in assets/)
+   - Maintains fully automatic workflow when invoked by ln-110-documents-pipeline
+   - User customizations in assets/ are preserved (only final HTML is regenerated)
+
+2. **Navigate to presentation assets directory**:
+   ```bash
+   cd docs/presentation/assets/
+   ```
+
+3. **Run build script**:
+   ```bash
+   node build-presentation.js
+   ```
+
+4. **Build Script Process**:
+   - **Step 1**: Read presentation_template.html
+   - **Step 2**: Read and inline styles.css → `<style>` tag
+   - **Step 3**: Read and inline scripts.js → `<script>` tag
+   - **Step 4**: Read all 6 tab files → inject into empty `<div>` containers
+   - **Step 5**: Replace {{PLACEHOLDERS}} with actual values
+   - **Step 6**: Write `../presentation_final.html`
+
+5. **Validate Output** (only if file was built):
+   - Check file size (~120-150 KB expected)
+   - Verify Mermaid diagrams syntax is valid
+   - Log: `✓ Build completed successfully`
+
+6. **Notify user**:
+   - If rebuilt (file existed): `✓ Rebuilt docs/presentation/presentation_final.html (~120-150 KB)`
+   - If created (file NOT existed): `✓ Created docs/presentation/presentation_final.html (~120-150 KB)`
+   - Remind: `Test in browser: Double-click to open, or use http-server`
+
+**Output**: docs/presentation/presentation_final.html (self-contained, ~120-150 KB, no external dependencies except Mermaid.js CDN)
+
+**⚠️ Important Note:**
+
+`presentation_final.html` is a **generated file** built from modular source files in `assets/`.
+
+- ❌ **DO NOT edit `presentation_final.html` directly** — changes will be lost on next rebuild
+- ✅ **DO edit source files** in `assets/` directory (template, tabs, styles, scripts)
+- 🔄 **Rebuild after changes**: `cd assets/ && node build-presentation.js`
+
+---
+
+## Complete Output Structure
+
+```
+docs/
+├── project/                      # Source documentation (input)
+│   ├── requirements.md
+│   ├── architecture.md
+│   ├── tech_stack.md
+│   ├── api_spec.md (conditional)
+│   ├── database_schema.md (conditional)
+│   ├── design_guidelines.md (conditional)
+│   └── runbook.md (conditional)
+├── reference/                    # Source documentation (input)
+│   ├── adrs/
+│   │   └── *.md (Category: Strategic | Technical)
+│   └── guides/
+│       └── *.md (optional)
+├── tasks/                        # Source documentation (input)
+│   └── kanban_board.md (Epic Story Counters)
+└── presentation/                 # Output directory
+    ├── README.md                 # Navigation hub
+    ├── presentation_final.html   # Final standalone HTML (~120-150 KB)
+    └── assets/                   # Modular HTML structure
+        ├── presentation_template.html  # Base HTML5 + 6 tabs
+        ├── styles.css                  # ~400-500 lines
+        ├── scripts.js                  # Tab switching + Mermaid
+        ├── build-presentation.js       # Node.js build script
+        └── tabs/
+            ├── tab_overview.html       # Landing page
+            ├── tab_requirements.html   # FRs + ADRs
+            ├── tab_architecture.html   # C4 diagrams
+            ├── tab_technical_spec.html # API + Data + Deployment
+            ├── tab_roadmap.html        # Epic list
+            └── tab_guides.html         # How-to guides
+```
+
+**Note**: Presentation READS from docs/project/, docs/reference/, docs/tasks/ but OUTPUTS to docs/presentation/.
+
+---
+
+## HTML Features
+
+- **Single Source of Truth**: No information duplication - each piece lives in exactly ONE tab
+- **Landing Page (Overview)**: Problem/Solution/Business Value, Stakeholders, Documentation Guide, Quick Facts, Tech Stack badges
+- **Interactive Navigation**: 6 tabs with SCOPE tags, state persistence (localStorage), smooth transitions
+- **Table-Based Layout**: FRs table only (Non-Functional Requirements are forbidden), Architecture highlights table
+- **Roadmap Simplified**: Vertical Epic list with In/Out Scope sections, status badges, Dependencies/Success Criteria
+- **ADR Organization**: Grouped by category (Strategic/Technical) with accordion, full content inline
+- **Diagram Visualization**: Mermaid.js with tab-switch rerender (C4, ER, Sequence, Deployment)
+- **Responsive Design**: Mobile-first (320px/768px/1024px+ breakpoints)
+- **Collapsible Sections**: Auto-collapse with scroll preservation
+- **Modern UI**: Clean professional design, WCAG 2.1 Level AA compliant
+- **English Language**: All presentation content in English
+
+---
+
+## Best Practices
+
+### Idempotent Operation
+- ✅ Checks file existence before creation (presentation/README.md)
+- ✅ Auto-rebuild: Always rebuilds presentation_final.html (generated file)
+- ✅ Assets preservation: Skips copying templates if assets/ exists (preserves customizations)
+- ✅ Safe re-runs: Can invoke multiple times without data loss
+
+### During Documentation Reading (Phase 1)
+- Validate paths: Check docs/ exists before reading
+- Graceful degradation: Continue if some files missing (warn user)
+- Extract metadata: Pull project name, date, version
+- Parse Mermaid blocks: Preserve diagram syntax
+
+### During Source Validation (Phase 2/3)
+- **Phase 2**: STOP execution if required files missing (requirements.md, architecture.md, tech_stack.md)
+- **Phase 3**: WARN about quality issues but don't block (missing diagrams, placeholders, sparse content)
+- Provide actionable suggestions: "Run ln-114 to complete docs"
+- Read-only: Never edit source docs
+
+### During Template Copying (Phase 5)
+- Check existing assets: Don't overwrite user-customized templates
+- Verify directory structure: Ensure tabs/ subdirectory created
+- Preserve permissions: Maintain executable permissions for build script
+
+### During Content Injection & Cleanup (Phase 6)
+- Preserve Markdown formatting: Convert MD → HTML correctly
+- Generate valid Mermaid syntax: Test all diagram syntax
+- Escape special characters: Prevent XSS vulnerabilities
+- Use semantic HTML: Proper heading hierarchy, ARIA labels
+- Preserve SCOPE tags: Keep HTML comments in tab files
+- **Complete example cleanup**: Ensure ALL example blocks deleted
+- **Verify project-specific content**: NO hardcoded e-commerce examples in final tabs
+
+### During Build (Phase 7)
+- Validate Node.js availability: Check `node --version` before running
+- Handle errors gracefully: Provide clear error messages
+- Test output: Open presentation_final.html to verify rendering
+- Size check: Warn if file >200 KB (may indicate issues)
+
+---
+
+## Customization Options
+
+Edit `assets/styles.css` (CSS variables for theming), `assets/presentation_template.html` (layout/tabs), or `assets/tabs/*.html` (tab content).
+
+**⚠️ After any customization:** Always rebuild the presentation:
+```bash
+cd assets/
+node build-presentation.js
+```
+
+**Important:** Never edit `presentation_final.html` directly — it's a generated file that gets overwritten on each build.
+
+---
+
+## Prerequisites
+
+**Orchestrator**: ln-110-documents-pipeline (invokes this worker in final step)
+
+**Standalone usage**: Can also be invoked directly for:
+- Rebuilding HTML presentation after documentation updates
+- Creating standalone presentation for existing docs
+- Validating source documentation readiness
+
+**Source Documentation Requirements**:
+- **Required files** (must exist):
+  - docs/project/requirements.md
+  - docs/project/architecture.md
+  - docs/project/tech_stack.md
+- **Optional files** (enhance presentation):
+  - docs/project/api_spec.md, database_schema.md, design_guidelines.md, runbook.md
+  - docs/reference/adrs/*.md (with Category field)
+  - docs/reference/guides/*.md
+  - docs/tasks/kanban_board.md
+
+**Quality Recommendations** (warnings only, not blocking):
+- architecture.md should have Mermaid diagrams (C4 Context/Container/Component)
+- database_schema.md should have ER diagram
+- Source docs should NOT contain placeholders (`{{PLACEHOLDER}}`, `[Add your...]`)
+- Minimum content length: requirements.md >500 words, architecture.md >1000 words, tech_stack.md >200 words
+
+**Dependencies**:
+- Node.js v18+ (for build-presentation.js)
+- Modern browser (Chrome/Firefox/Safari/Edge last 2 versions)
+- Internet connection (Mermaid.js CDN, optional)
+
+**Idempotent**: Yes - can be invoked multiple times without side effects:
+- Preserves existing README.md
+- Preserves existing assets/ (user customizations)
+- Always rebuilds presentation_final.html (generated file)
+
+---
+
+## Definition of Done
+
+| Phase | Critical Checkpoints |
+|-------|---------------------|
+| **1. READ DOCS** | ✅ All docs loaded from docs/project/, docs/reference/, docs/tasks/ ✅ Metadata extracted ✅ Mermaid blocks preserved |
+| **2. VALIDATE EXISTS** | ✅ Required files exist (requirements.md, architecture.md, tech_stack.md) ✅ ERROR if missing |
+| **3. VALIDATE QUALITY** | ✅ Diagrams checked ✅ Placeholders detected ✅ Content length checked ✅ WARN only (non-blocking) |
+| **4. CREATE DIR** | ✅ docs/presentation/ created ✅ README.md created/preserved |
+| **5. COPY TEMPLATES** | ✅ assets/ created with all templates OR preserved if exists |
+| **6. INJECT CONTENT** | ✅ All 6 tabs populated ✅ **CRITICAL: Example blocks deleted** ✅ No `<!-- EXAMPLE -->` markers ✅ No hardcoded e-commerce data |
+| **7. BUILD HTML** | ✅ `node build-presentation.js` executed ✅ presentation_final.html created (~120-150 KB) ✅ Tested in browser |
+
+**Output:** docs/presentation/presentation_final.html + assets/ + README.md
+
+---
+
+## Example Usage
+
+User: "Build HTML presentation"
+
+Process:
+1. **READ DOCS** - Load documentation from docs/project/, docs/reference/, docs/tasks/
+2. **VALIDATE SOURCE EXISTS** - Check requirements.md, architecture.md, tech_stack.md exist (ERROR if missing)
+3. **VALIDATE SOURCE QUALITY** - Check diagrams, placeholders, content length (WARN if issues, but continue)
+4. **CREATE DIR** - Create docs/presentation/ + README.md navigation hub
+5. **COPY TEMPLATES** - Copy HTML/CSS/JS templates to assets/ (or preserve existing)
+6. **INJECT CONTENT** - Parse MD docs → replace placeholders in tabs → delete example blocks
+7. **BUILD HTML** - Assemble modular components → standalone presentation_final.html (~120-150 KB)
+
+Output: docs/presentation/presentation_final.html (6 tabs: Overview, Requirements, Architecture, Technical Spec, Roadmap, Guides) + docs/presentation/README.md (navigation hub) + docs/presentation/assets/ (modular source files)
+
+---
+
+## Troubleshooting
+
+- **ERROR: Missing required files**: Run ln-114-project-docs-creator to create requirements.md, architecture.md, tech_stack.md
+- **WARN: Missing diagrams**: Add Mermaid diagrams to architecture.md (C4 Context/Container/Component) and database_schema.md (ER diagram)
+- **WARN: Placeholders found**: Complete documentation in source MD files before building
+- **WARN: Sparse content**: Expand documentation (requirements.md >500 words, architecture.md >1000 words, tech_stack.md >200 words)
+- **Build script fails**: Check Node.js v18+, navigate to assets/, verify all files exist
+- **Mermaid diagrams not rendering**: Check syntax with Mermaid Live Editor, verify CDN loaded
+- **Tabs not switching**: Check JavaScript loaded, open browser console for errors
+- **File too large (>200 KB)**: Reduce diagrams, minify CSS/JS, remove unused rules
+
+---
+
+## Technical Details
+
+**Standards**: HTML5, CSS3 (Flexbox/Grid/Variables), ES6+, WCAG 2.1 Level AA, Mobile-first responsive design, Progressive enhancement, Mermaid.js v11
+
+**Dependencies**:
+- Node.js v18+ (build script)
+- Modern browser (Chrome/Firefox/Safari/Edge last 2 versions)
+- Internet connection (Mermaid.js CDN, optional)
+
+**Language**: English only (all presentation content)
+
+---
+
+**Version:** 7.0.0 (MAJOR: Added Phase 2/3 validation (source docs existence + content quality). Removed ln-120-docs-validator references. Renumbered phases (2-5 → 4-7). Unified READ+VALIDATE+CREATE workflow. Read-only source validation.)
+**Last Updated:** 2025-11-18