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>

CLAUDE.md

@@ -6,7 +6,7 @@ Claude-mem is a Claude Code plugin providing persistent memory across sessions.
 
 **Your Role**: You are working on the plugin itself. When users interact with Claude Code with this plugin installed, your observations get captured and become their persistent memory.
 
-**Current Version**: 5.4.1
+**Current Version**: 5.4.2
 
 ## Critical Architecture Knowledge