Pinpoint #172: SCHEMAS.md v1.5 Emission Baseline documentation inaccuracy
discovered during cycle #98 probe.
The Phase 1 normalization targets section claimed:
"unify where `action` field appears (only in 4 inventory verbs)"
But reality is only 3 inventory verbs have `action`:
- mcp
- skills
- agents
list-sessions uses `command` instead (the documented 1-of-13 deviation
already captured elsewhere in v1.5 baseline).
This is a doc-truthfulness issue (same family as cycles #76, #79, #82).
Active misdocumentation leads downstream consumers to assume 4-verb
coverage when building adapters/dispatchers.
Changes:
1. SCHEMAS.md: 'only in 4 inventory verbs' → 'only in 3 inventory verbs: mcp, skills, agents'
2. Added regression test `v1_5_action_field_appears_only_in_3_inventory_verbs_172`
- Asserts mcp/skills/agents HAVE action field
- Asserts help/version/doctor/status/sandbox/system-prompt/bootstrap-plan/list-sessions do NOT have action field
- Forces SCHEMAS.md + binary to stay synchronized
Test added:
- `v1_5_action_field_appears_only_in_3_inventory_verbs_172` (8 negative cases + 3 positive cases)
Tests: 227/227 pass (+1 from #172).
Related: #155 (doc parity family), #168c (emission baseline).
Doc-truthfulness family: #76, #79, #82, #172.
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