feat: initial release of handover plugin for Claude Code

- /handover skill: creates living document preserving context across sessions
- /takeover skill: recovers from forgotten handovers by reading old transcripts
- Statusline: shows context usage % and topic segmentation
- Background daemon uses Haiku for cheap conversation analysis
- Tracks suppressed issues, learnings, dead ends, open questions
- Auto WIP commits to prevent accidental reverts

.gitignore

@@ -0,0 +1,10 @@
+# Cache files
+segment_cache.json
+debug_input.json
+current_session*.txt
+
+# Node
+node_modules/
+
+# OS
+.DS_Store