Merge PR #64: fix(routes) remove duplicate GET /api/sessions + DELETE/PATCH session routes
Removes route_sessions() from the GET handler which was shadowing session_list() in sessions.el. Adds DELETE /api/sessions/:id and PATCH /api/sessions/:id routes. Also includes bridge_save/agentic_resume raw-JSON embedding fix (messages_raw/tools_raw fields). Conflict resolution: kept HEAD's workspace root check for write_file tool, and bridge blob validation guards, which were added to main after Tim's branch diverged.
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