fix(copilot): sync .github/copilot-instructions.md + bats parity (SDD-005)#62
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…-005) AUDIT-003 detected drift: PR #60 (AI-019) added a "Model Tier" subsection to ai/copilot/copilot-instructions.md but missed .github/copilot-instructions.md. GitHub Copilot reading the dotfiles repo therefore did NOT see the model-tier policy that every other agent reads. Same drift class as BUG-001 (#40) and BUG-002 (#47): mirror files that must move together silently diverge when an editor touches only one. Changes: * .github/copilot-instructions.md: append the Model Tier section; align pointer-banner fallback wording ("from the current repo"). ai/copilot/copilot-instructions.md untouched (canonical source). * tests/docs-drift.bats: new file with 5 cases. Parity rule: stripping blockquote lines (`^> `) from both files must yield byte-identical content. Sub-rule: both files must contain a `## Model Tier` section + AGENTS.md reference in the banner. CI fails loud on future drift. Tests: 650/650 bats green (was 645; +5 from docs-drift.bats). Spec: specs/SDD-005-github-copilot-instructions-sync/.
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Summary
Closes a real drift detected by AUDIT-003: PR #60 (AI-019) added a "Model Tier" subsection to
ai/copilot/copilot-instructions.mdbut missed.github/copilot-instructions.md. GitHub Copilot reading the dotfiles repo did NOT see the model-tier policy that every other agent reads.Same drift class as BUG-001 (#40) and BUG-002 (#47) — mirror files that must move together silently diverge when an editor touches only one.
SDD checklist
SDD-005-github-copilot-instructions-syncin11-tasks.md)specs/SDD-005-github-copilot-instructions-sync/in this PRproposal.mdfilled (Why / What / AC / Risks)tasks.mdin TDD orderverification.mdfilled with evidenceSDD skip rationale
Test plan
bats tests/*.bats→ 650/650 pass (was 645; +5 from newtests/docs-drift.bats)bats tests/docs-drift.bats→ 5/5 green:## Model Tierheaderdiff: only the pointer-banner reference form differs (markdown link vs plain — by design per file deploy context)Out of scope
.github/copilot-instructions.mdfromai/copilot/...(a pre-commit hook). Bats parity check is sufficient enforcement; generation adds complexity without proportional benefit.ai/copilot/copilot-instructions.md(canonical source). Drift flows canonical → mirror, not back.Promotion candidate
The verification.md flags a lesson worth promoting to
90-lessons.md:Three repeats so far (BUG-001 / BUG-002 / AI-019). Generic prevention rule.
Companion audit artifact
30-architecture/audit-003-docs-drift.md(vault) is the audit that surfaced this finding.