Mathias f43e0bccbf feat(graph): wire graphsync into MCP write/ingest/tunnel handlers ...

Commit 2 of Track A. Service stays a no-op until BRAIN_GRAPH_ENABLED=
true; flipping it on creates the schema (idempotent), starts indexing
every successful write, and optionally backfills the existing brain
dir.

- internal/graphsync: best-effort wrapper around graph.Extract +
  graphstore. IndexDoc reads docPath under brainDir, parses, upserts
  entity + replaces edges. BackfillFromBrainDir walks wiki/ +
  knowledge/. Both are no-ops on nil store so callers wire
  unconditionally.

- mcp.Server gains WithGraph builder + graphsync.Store field.
  brain_write, brain_ingest, brain_ingest_raw, brain_tunnel call
  indexInGraph after success — failures slog.Warn but never
  propagate (graph is augmentation, not correctness).

- cmd/server gates the wiring on BRAIN_GRAPH_ENABLED=true (default
  off so first rollout doesn't surprise). BRAIN_GRAPH_BACKFILL=true
  triggers a one-shot walk of the brain dir on boot.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-23 15:21:33 +02:00

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