fixture-estimate-not-in-contract

name	fixture-estimate-not-in-contract
description	Measurement skill declaring an estimate field that appears in the instruction's prose but not in its JSON output contract (negative fixture for the estimate-in-contract exact-set check).
governing_question	Does a prose-only field mention fail the contract check?
artifact_class	measurement
scope	repo
kata_surface	none
triggers	["fixture"]
inputs	["none"]
outputs	["none"]
self_measure	{"command":"coh-self","registry":"targets/registry.tsc","targets":["spec"],"cross_target":false,"instruction":"schemas/fixtures/skill-frontmatter/invalid/estimate-not-in-contract/instruction.md","output_root":".tsc/self","default_mode":"mechanical","consistency":{"mechanical":"identical","llm_repeats":3,"llm_spread":"max abs pairwise diff over numeric contract fields, barrier-mapped"},"mechanical":{"backend":"src/engine/ocaml/lib/mechanical_scoring.ml","determinism":"fixture","signals":{"alpha":["alpha.terminology_consistency"],"beta":[],"gamma":[]}},"llm":{"estimates":["target","confidence","summary","made_up_field"],"must_not":["fixture"],"validation":"fixture","providers":{"local":"fixture","ci":"fixture"},"ci_prompt":"fixture"},"render":{"command_out":"scripts/coh-self","workflow_out":".github/workflows/tsc-self-measure.yml"},"ledger":{"path":".tsc/COHERENCE.md","cadence":"version-increments","mode":"hybrid","script":"scripts/coherence-ledger.sh","workflow_out":".github/workflows/tsc-coherence-ledger.yml"},"ci":{"llm_secret":"CLAUDE_CODE_OAUTH_TOKEN","llm_gate":"secret-presence","permission_intent":["contents.read"]}}

Fixture

Negative fixture: made_up_field is mentioned in the instruction's prose but absent from its JSON output contract; the exact-set check must fail it.