Brainerd Reflect

Persist durable repo memory from the current session and route to the correct harness-specific flow.

Detect the harness first

1. If the run exposes brainerd_current_session and brainerd_apply_changes, you are in the Pi branch. Stay inside the Pi tool flow.
2. If CODEX_THREAD_ID is present, you are in the Codex branch. Use the Codex wrapper.
3. If BRAINERD_CLAUDE_SESSION_ID or BRAINERD_CLAUDE_TRANSCRIPT_PATH is present, you are in the Claude branch. Use the Claude wrapper.
4. If none of those signals match, stop and report that harness detection failed. Do not guess.

Pi branch

1. Read the ambient brain context already injected into the run.
2. Open additional brain/ files only when needed.
3. Call brainerd_current_session.
4. Distill the smallest durable change that helps future sessions.
5. Prefer updating an existing principle; otherwise create one focused note.
6. Apply changes only through brainerd_apply_changes.