docs: comprehensive documentation overhaul for v2.2.3

Major documentation update bringing all docs current with the 122-tool,
16-category state of the project (previously frozen at v2.1.0-alpha/59 tools).

New documentation (9 files):
- FREEROUTING_GUIDE.md - autorouter setup, Docker/Podman, all 4 tools
- SCHEMATIC_TOOLS_REFERENCE.md - all 27 schematic tools with parameters
- ROUTING_TOOLS_REFERENCE.md - all 13 routing tools with examples
- FOOTPRINT_SYMBOL_CREATOR_GUIDE.md - 8 creator tools with examples
- SVG_IMPORT_GUIDE.md - SVG logo import tool
- DATASHEET_TOOLS_GUIDE.md - datasheet enrichment tools
- PCB_DESIGN_WORKFLOW.md - end-to-end design guide
- ARCHITECTURE.md - system architecture for contributors
- INDEX.md - documentation table of contents

Updated documentation (12 files):
- README.md - tool count 64->122, feature list, contributor credits
- TOOL_INVENTORY.md - complete rebuild with all 122 tools
- STATUS_SUMMARY.md - updated to v2.2.3 feature matrix
- ROADMAP.md - marked completed milestones, added v2.3+ vision
- KNOWN_ISSUES.md - removed resolved issues, added v2.2.x fixes
- CLIENT_CONFIGURATION.md - added KICAD_MCP_DEV, FREEROUTING_JAR env vars
- LIBRARY_INTEGRATION.md - added symbol and project-local library support
- ROUTER_ARCHITECTURE.md, ROUTER_QUICK_START.md - updated tool counts
- IPC_BACKEND_STATUS.md - updated dates
- JLCPCB_USAGE_GUIDE.md - added cross-reference note
- CONTRIBUTING.md - added ARCHITECTURE.md reference, updated tool count

Archived 10 completed planning docs to docs/archive/.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/CLIENT_CONFIGURATION.md

@@ -220,6 +220,8 @@ For any MCP-compatible client that supports STDIO transport:
 | `LOG_LEVEL` | Logging verbosity | `info` |
 | `NODE_ENV` | Node environment | `development` |
 | `KICAD_BACKEND` | Force backend (`swig` or `ipc`) | Auto-detect |
+| `KICAD_MCP_DEV` | Enable developer mode (auto-save logs to project) | `0` (disabled) |
+| `FREEROUTING_JAR` | Path to FreeRouting JAR file for autorouting | Not set |
 
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@@ -537,5 +539,5 @@ For bugs or feature requests, open an issue on GitHub.
 
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-**Last Updated:** October 25, 2025
-**Version:** 2.0.0-alpha.1
+**Last Updated:** March 21, 2026
+**Version:** 2.2.3+