Release v5.4.2: CWD spatial awareness fix

Bugfix release:
- Fixed SDK agent spatial awareness by propagating CWD context from tool execution
- Prevents false "file not found" reports when working across multiple repositories
- Added comprehensive test suite for CWD propagation (8 passing tests)
- Security analysis: Zero vulnerabilities, CodeQL approved

Technical changes:
- Hook extracts CWD from PostToolUseInput and forwards to worker service
- Worker types define optional CWD fields in PendingMessage and ObservationData
- SessionManager passes CWD to SDKAgent's addObservation
- SDK agent includes CWD in tool observation objects sent to Claude API
- Prompts render tool_cwd XML elements with spatial awareness guidance
- All changes present in compiled outputs (save-hook.js, worker-service.cjs)

Documentation:
- Technical documentation: context/CWD_CONTEXT_FIX.md
- PR summary: PR_SUMMARY.md
- Security review: SECURITY_SUMMARY.md
- CHANGELOG entry added

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "5.4.1",
+  "version": "5.4.2",
   "description": "Persistent memory system for Claude Code - seamlessly preserve context across sessions",
   "author": {
     "name": "Alex Newman"