Add docs/contributing/activation_trace.md: a 210-line contributor guide
covering the env-gated activation trace infrastructure (Extension 0),
its five configuration env vars, the trace_step() context manager, and
the JSONL output format.
The doc also sketches Extensions 1-3 (FX graph capture, AST-level
instrumentation, dispatch-table interception) as future work, giving
contributors a clear design ladder to climb without requiring them to
implement everything at once.
Update tests/local_tests/magi-human.md with the Wave 9 investigation
entry: records the E2E smoke result (28,864 JSONL records, 451 hooked
modules), the zero-overhead-when-off confirmation, and the new
fastvideo/tests/hooks/test_activation_trace.py test row in the Phase 11
status table. Last-verified date bumped to 2026-05-01 (Wave 9).
SolitaryThinker
f5ce12f17a