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Milestone 419 step 1. `rule_usage_events` could say a rule was SURFACED and that it was PULLED. It could not say what happened next, so a rule that fires constantly and is always obeyed and a rule that fires constantly and is never obeyed left byte-identical telemetry. The second is far the more urgent and was the one the readout could not name — measured on a session where three of seven misses were caught by the operator and none by the system. Two new events, `applied` and `departed`, and a `detail` column carrying the why of a departure. No CHECK migration: `event` was created in 0094 as plain Text with no constraint, verified in the migration rather than assumed from the model, so rule 36 does not bite here — said in both places because the next person adding a value will reach for it. THE THIRD STATE IS DERIVED, AND THAT IS THE DESIGN. Read-and-silently- unchanged is the failure this milestone was opened on, and it cannot be reported: an agent that knew it was ignoring a rule would not be ignoring it. So nothing here asks. `applied` and `departed` are reported; the third state is a rule that was opened and left no trace. An `ignored` enum member would collect nothing while reading as though it had measured something, which is #3311's failure — a statistic that could not vary being taken for a finding. `detail` is a column rather than two more bare event strings because a departure stripped of its reason reads back as a miss, so the two states this exists to separate would collapse again one layer down, in the readout, where nobody would see it happen. Nullable: following a rule needs no argument, and an expensive event is one that stops being recorded. `outcome_state` is the single reading of the four states, taking the aggregate `usage_for_rules` already returns, so the badge, the readout and any later session summary cannot disagree about what "followed" means — the drift #3246 found across the rules system. A departure outranks an application: a rule both applied and argued with is a rule someone argued with, and the argument is the half worth surfacing. `rule_outcome` is the MCP door, classed as a WRITE. The read-only set tolerates getters that call record_pulled, but those are reads that leave a trace; this tool's entire effect is the row, and the row carries prose the agent authored. A read-scoped key that can put text in the operator's database is not read-scoped, whatever table it lands in. Backup carries `detail` on both sides. It is the one field here a fresh install cannot re-earn — counts come back by being used again, a stated reason exists once — and #4197 records that the column guard watches the export side only, so the round-trip test is the thing that would catch a one-sided add. Delivery is deliberately not settled here: how an agent gets prompted to record an outcome is step 3's subject, and the same record serves whichever answer that step reaches. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy