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mod: per-session load-proof marker #444
Description
From #323 follow-up research. One line per session from hooks/mod/cost-ledger.ts.
Write a single marker (session id, CLI version, module loaded) on the first hook call, so "kill switch served off" can be told apart from "loaded but idle". Under -p the UI log only reaches the debug log, so write to the existing ledger path instead and let cost-report show a load-rate line. Same observer contract as the ledger.
Acceptance: unit test; cost-report prints loaded/total sessions; modules off means no row (the signal).
Activity
Merge pull request #446 from wasikarn/claude/mod-version-status-442-444
wasikarn commentedon Oct 4, 2026
Done in #446 (merged). The first hook call of each module load appends {t, session_id, loaded: true, cli, mh} to cost-ledger.jsonl. cost-report prints 'module loaded: N of M sessions since the first load marker'. With modules off, no row is written. Tests: 14 mod tests pass, test-cost-report.sh 27/27. The live
claude -pcheck that a marker lands is still to run (steps in docs/reference/cost-ledger-module.md).