docs: move PRD.md and SDLC.md to docs/ subdirectory

Consolidate all documentation files under docs/ directory.
Update AGENTS.md and README.md to reflect new file locations.

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Assisted-by: GLM-5 via Crush <crush@charm.land>

AGENTS.md

@@ -128,7 +128,6 @@
 /
 ├── run.sh                 # MAIN ENTRY POINT - All operations (build/test/lint/iso/monitor/VM)
 ├── Dockerfile             # Multi-stage build environment
-├── PRD.md                 # Product Requirements Document
 ├── README.md              # Project documentation
 ├── AGENTS.md              # THIS FILE - Agent guidelines
 ├── STATUS.md              # Manager status report (quick-glance)
@@ -140,10 +139,10 @@
 ```
 ├── STATUS.md              # Manager report - current status, blockers, next actions
 ├── JOURNAL.md             # AI memory - ADRs, patterns, lessons learned
-├── PRD.md                 # Product requirements
 ├── AGENTS.md              # Agent guidelines (START HERE)
-├── SDLC.md                # Software Development Lifecycle (READ THIS)
 └── docs/                  # Detailed documentation
+    ├── PRD.md             # Product Requirements Document
+    ├── SDLC.md            # Software Development Lifecycle (READ THIS)
     ├── TEST-COVERAGE.md   # Test suite coverage
     ├── VERIFICATION-REPORT.md  # Compliance verification
     ├── COMPLIANCE.md      # Compliance standards
@@ -242,8 +241,8 @@ git log --oneline -10
 
 #### 2. UNDERSTAND REQUIREMENTS
 - Read MANDATORY SECURITY REQUIREMENTS (above)
-- Review PRD.md for detailed requirements
-- Read SDLC.md for development workflow (CRITICAL)
+- Review docs/PRD.md for detailed requirements
+- Read docs/SDLC.md for development workflow (CRITICAL)
 - Check AGENTS.md for critical constraints
 - Understand Docker-only workflow
 
@@ -462,9 +461,10 @@ Container Side    Host Side          Purpose
 ### Quick Reference
 - **AGENTS.md** - THIS FILE - Start here
 - **README.md** - Project overview and quick commands
-- **PRD.md** - Product Requirements Document (detailed)
+- **docs/PRD.md** - Product Requirements Document (detailed)
 
 ### Detailed Documentation (docs/)
+- **docs/SDLC.md** - Software Development Lifecycle
 - **docs/TEST-COVERAGE.md** - Test suite coverage and details
 - **docs/VERIFICATION-REPORT.md** - Verification and compliance report
 - **docs/COMPLIANCE.md** - Compliance standards and requirements
@@ -526,7 +526,8 @@ Container Side    Host Side          Purpose
 ### Before Making Changes
 1. **Read relevant documentation**:
    - AGENTS.md (this file) - For agent guidelines
-   - PRD.md - For requirements
+   - docs/PRD.md - For requirements
+   - docs/SDLC.md - For development workflow
    - README.md - For quick commands
    - docs/TEST-COVERAGE.md - For test details
    - docs/VERIFICATION-REPORT.md - For verification results
@@ -630,10 +631,11 @@ Before marking work complete:
 ### Check These First
 1. **AGENTS.md** - This file
 2. **README.md** - Quick commands
-3. **PRD.md** - Requirements
-4. **docs/TEST-COVERAGE.md** - Test details
-5. **docs/VERIFICATION-REPORT.md** - Verification results
-5. **JOURNAL.md** - Session history
+3. **docs/PRD.md** - Requirements
+4. **docs/SDLC.md** - Development workflow
+5. **docs/TEST-COVERAGE.md** - Test details
+6. **docs/VERIFICATION-REPORT.md** - Verification results
+7. **JOURNAL.md** - Session history
 
 ### Debug Mode
 ```bash