gitignore: stop tracking runtime data, logs, build artifacts, scratch

Untracked count was 100+; almost all were data/_*/ daemon state, generated
parquets under data/datasets and data/vectors, the 33GB data/lance/ tree,
node_modules, exports, logs, per-run distillation reports, and test
scratchpads. None of these are content — all regenerate from inputs.

Now down to 33 untracked items, all real content (scripts, systemd unit,
test scenarios, dev-only sidecar UIs, kimi audit reports). Those need
J's call on what to track vs leave parked.

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

.gitignore

@@ -12,3 +12,41 @@ data/headshots/_thumbs/
 # ComfyUI on-demand generated portraits (per-worker unique). Cached on first
 # request; fully regeneratable via /headshots/generate/:key.
 data/headshots_gen/
+
+# Runtime data — all regeneratable from inputs or accumulated by daemons.
+# Anything under data/_<name>/ is internal state (auditor outputs, KB caches,
+# pathway memory snapshots, HNSW trial results, etc.). Anything under
+# data/datasets/ or data/vectors/ is generated by ingest/index pipelines.
+data/_*/
+data/lance/
+data/datasets/
+data/vectors/
+data/demo/
+data/evidence/
+data/face_test/
+data/headshots_role_pool/
+data/icons_pool/
+data/scored-runs/
+data/workspaces/
+data/catalog/
+data/**/*.bak-*
+data/**/*.pre-*-bak
+
+# Logs
+logs/
+
+# Build artifacts
+node_modules/
+exports/
+mcp-server/data/
+
+# Per-run distillation reports (timestamp-named); keep the parent dir tracked
+# via .gitkeep if needed but don't carry every batch's report set.
+reports/distillation/[0-9]*/
+reports/distillation/*-*-*-*-*/
+
+# Test scratch — scratchpads, traces, sessions are regenerated each run.
+# PRD/scenario fixtures stay tracked (they ARE the test).
+tests/agent_test/_*
+tests/agent_test/sessions/
+tests/real-world/runs/