fix: align ws-bridge.js imports with simplified vault.js API
After ai-agent-full-shell simplified vault.js to read-only, ws-bridge.js
still imported removed functions (createNote, appendToNote, editNoteFrontmatter,
deleteNote, linkNotes, listNotes, readNote) — breaking CI bundle step.
Fix:
- Import only getNote, searchNotes, vaultContext from vault.js
- Update open_note/read_note handlers to use getNote
- Remove write tool handlers — agent uses native bash/write tools
- Remove orphaned buildFrontmatter helper
eda8bc373e