Reorganize repository structure and clean up documentation

Clean up and organize the flask-shopdb repository for better
maintainability and discoverability:

## Changes

- Update .gitignore for build artifacts (publish/, data/, 122M total)
- Reorganize .claude/ into 6 subdirectories with README navigation
- Consolidate overlapping MCP setup guides into MCP-QUICK-START.md
- Move deployment docs from root to docs/deployment/
- Archive dated status reports to .claude/archived/
- Delete temporary files (logs, backups, empty reports, ~50K)

## New Structure

.claude/ organized into:
- setup/ - MCP, VM, Hyper-V, GitHub setup guides + scripts (17 files)
- plans/ - Feature plans and protocols (5 files)
- maintenance/ - Deployment checklists and reports (4 files)
- archived/ - Historical documentation (9 files)
- skills/ - Claude Code automation (5 files)
- workflows/ - Security audit workflow (1 file)

docs/deployment/ created with 6 deployment guides:
- LOCAL-DEV-SETUP.md, DOCKER-SETUP.md, DOCKER-PREBUILT-APPROACH.md
- PRODUCTION-READINESS.md, DEPLOY-TO-VM.md, README.md

Root directory cleaned to essential docs only:
- CLAUDE.md, README.md, CONTRIBUTING.md, CHANGELOG.md

Benefits:
- Clear navigation via README.md in each subdirectory
- No duplicate/overlapping documentation
- Large artifacts properly gitignored (won't bloat repository)
- Historical context preserved in archived/

See .claude/CLEANUP-SUMMARY.md for complete details.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/skills/build-agent.md

@@ -0,0 +1,49 @@
+---
+name: build-agent
+description: Build and publish ShopDB agent and tray executables to Documents folder
+---
+
+Build the ShopDB endpoint agent and tray applications, then copy them to Documents/shopdb-builds with version information.
+
+## Steps
+
+1. Navigate to agent directory: `C:\Users\270015376\Documents\github\flask-shopdb\agent`
+
+2. Publish the agent service:
+   ```
+   dotnet publish ShopDbEndpointAgent/ShopDbEndpointAgent.csproj -c Release -o publish/agent
+   ```
+
+3. Publish the tray application:
+   ```
+   dotnet publish ShopDbEndpointAgent.Tray/ShopDbEndpointAgent.Tray.csproj -c Release -o publish/tray
+   ```
+
+4. Create dated build folder:
+   ```
+   mkdir -p C:/Users/270015376/Documents/shopdb-builds/$(date +%Y%m%d)
+   ```
+
+5. Copy executables to build folder:
+   - `publish/agent/shopdbagent.exe`
+   - `publish/tray/shopdb-endpoint-tray.exe`
+
+6. Create VERSION.txt with:
+   - Agent version from ShopDbEndpointAgent.csproj
+   - Tray version from ShopDbEndpointAgent.Tray.csproj
+   - Git commit hash (short)
+   - Branch name
+   - Summary of changes in this release
+
+## Expected Output
+
+- Executables in: `C:\Users\270015376\Documents\shopdb-builds\YYYYMMDD\`
+- shopdbagent.exe (typically ~35MB)
+- shopdb-endpoint-tray.exe (typically ~69MB)
+- VERSION.txt with release notes
+
+## Notes
+
+- Agent and tray versions must be coordinated (bumped together)
+- If tray publish fails with "file in use", the agent build is still running - wait and retry
+- Build takes 2-3 minutes total