The session handoff protocol

Trace-detective lab (Module 11, L11.2): verify tests and the manifest before building. The healthy session runs 5/5, manifest ba1a531f581d, commit c1, post-handoff verify PASS. The drifted session halts at step 2 with 3 reasons (tests fail, manifest now e1a894022d1a, no commit recorded) and skips steps {2, 4}. A comment on the healthy file still passes tests and fails the manifest, so verify is tests_ok and manifest_ok. The progress template is T2 | evidence=work/calc.py | tests=green | commit=c1. In-memory only; local ledger, not git; no threads or provider call.

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