initial implementation: brain-dump session server with dual LLM backends

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Headless Koa v3 server exposing REST + SSE around the brain-dump skill:
- AgentBackend adapter seam with two implementations: Claude Agent SDK
  (skill loading, session resume via sdk_session_id) and a hand-rolled
  OpenAI-compatible tool-calling loop (vault-scoped file tools, SKILL.md
  injected into the system prompt, history persisted in SQLite)
- session CRUD + one-turn-at-a-time SSE streaming (text deltas, file_write
  events, turn_complete), per-session lock, abort on disconnect
- node:sqlite storage (sessions, messages, turn_events) with migrations
- vault allow-list + symlink-aware path-escape prevention (incl. dangling
  symlink defense), read-only git status/diff endpoints, configurable CORS
- deterministic mock chat-completions server (scripts/mock-openai.ts) for
  end-to-end testing without a real model

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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codinget

2026-07-18 13:48:17 +00:00

co-authored by Claude

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