[auto] reflect: narrow-the-scope names the shared-premise step when one gate rejects twice

[EdbertChan]

Summary

The narrow-the-scope skill gains one method sentence: when one gate rejects a second edit, write down the premise both edits shared, then read the gate's source before a third.

The skill's fires_example fixture gains a matching scenario, which the skill test coverage gate requires for a prose-only skill change.

Review Claim

The new sentence names the missing step that ended two real three-attempt loops, in the file's existing tone, without changing any trigger.

Review Lane

behavior

Review Unit

product-skill

Safety Invariant

One sentence added to an existing numbered step and one fixture paragraph; no hook, install path, or trigger condition changes, so nothing fires differently.

Assumptions: headless mode, Safety Invariant is unconfirmed by a human.

Slice Rationale

Evidence: in two read-confirmed Invoker sessions the agent only escaped a three-attempt loop by reading the gate's own source (a body-keyword checker that scanned the whole PR body; a UNIT_PATTERNS regex), and the shared premise was never written down.

This is the prose item from the same reflect pass as the stack's first PR (corpus_scan fix). It is a different Review Unit, so it lands as its own PR on top.

Non-goals

• No change to narrow-the-scope's mechanical trigger or engine/hooks/narrow-the-scope/.
• No change to the stays_silent fixture or the reflect skill.

Test Plan

Test Plan

• python3 scripts/check_skill_test_coverage.py --base origin/main --head HEAD -> ok skill test coverage
• python3 engine/skills/make-pr/scripts/preflight.py --base origin/main -> ok preflight passed (codify-has-code, no-dated-provenance, three-harness, ecosystem-boundaries, skill-file-refs, skill-test-coverage, skill-trigger-mechanism all ok)
• python3 scripts/check_no_dated_provenance.py --base origin/main -> ok no dated provenance
• bash scripts/run_all_tests.sh -> exit 0 (31 suites OK)

Revert Plan

Revert Plan

• Safe to revert? Yes
• Revert command: git revert a30b78a
• Post-revert steps: None
• Data migration? No

Depends-On: #288

🤖 Generated with Claude Code

https://claude.ai/code/session_014NSMiMsTPuon8otdhRaJEq

[EdbertChan]

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	[auto] reflect: corpus_scan skips slow or oversized transcripts instead of crashing	#288
2	[auto] reflect: narrow-the-scope names the shared-premise step when one gate rejects twice	#289	👈

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