ci: add shared-inputs stamp drift check to CI and pre-commit

[hatayama]

Summary

• CI and the pre-commit hook now reject stale shared-inputs stamps before merge.
• Agent docs note that full EditMode CI never runs on pull requests.

User Impact

• Before: a stamp generated before a new shared input was git add-ed could ship with a silently stale hash. check-release-triggers only checked that stamp files were touched, not that their values were current (this happened in PR feat: replace unknown-command list with closest-match suggestions #2063 and was found only by manual recalculation in review).
• After: CI regenerates the stamps and fails on any diff, and the pre-commit hook restamps automatically when shared inputs are staged.

Changes

• Add a Check shared-inputs stamp drift step to build-cli in build-and-test.yml (regenerate-and-diff on the two stamp files only).
• Extend .husky/pre-commit to detect staged shared-input paths, reject partial staging / unstaged stamp edits, restamp, and git add the stamp files.
• Document in AGENTS.md that unity-editmode-tests.yml runs only on schedule / workflow_dispatch, never on PR CI.

Regenerate-and-diff reuses scripts/stamp-release-inputs.sh so the hash logic is not duplicated in Go. The hook's path filter is intentionally coarser than the stamp script's real input list; restamping is idempotent, so a false positive is a no-op.

Verification

• scripts/stamp-release-inputs.sh on a clean branch: porcelain empty (no pre-existing drift).
• Hook local checks: auto-restamp on new shared input; no-op when shared inputs are untouched; rejects partial staging; rejects unstaged stamp edits.
• scripts/test-stamp-release-inputs.sh passed.

[coderabbitai]

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📝 Walkthrough

Walkthrough

CI now checks regenerated shared release-input stamps for drift and documents that the full Unity EditMode suite runs only on scheduled or manually dispatched workflows.

Changes

CI consistency checks

Layer / File(s)	Summary
Stamp validation and CI guidance .github/workflows/build-and-test.yml, AGENTS.md	The build-cli job regenerates and verifies both shared-inputs stamp files, while AGENTS.md documents the scheduled and manual triggers for the full EditMode suite.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding shared-inputs stamp drift checks to CI and pre-commit.
Description check	✅ Passed	The description is directly related to the changeset and accurately describes the CI and documentation updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/stamp-drift-guard

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