chore(stack): reconcile release evidence hardening

[seonghobae]

Purpose

Validate a safe ancestry reconciliation for existing draft PR #56 after its stacked prerequisite PR #55 advanced. This PR is a temporary read-only validation surface, not a replacement product slice and not a merge candidate.

Exact live ancestry

• Current base branch: agent/reproducible-release-acceptance
• Exact current base tip at creation: 49ef42cb93dd8b05e532f41638851cefb461b908
• Validation head: 00d8d4405943094ac717020eaaae79c3aba88537
• Live compare: 8 commits ahead, 0 behind; merge base equals the exact current base tip.

Existing PR #56 head 5dff29b234977048171dbdd9d50c394301337a90 had diverged from current #55 by 9 prerequisite commits. Its connector-exposed generated merge commit 73791fed8c831396cf83a42b456fc7bccfc54916 explicitly merged the feature into stale prerequisite bd72a0c480661534058081fff5b6ec1ea6eb5e6f, so that synthetic merge was rejected as stale-base evidence.

Replay integrity

The eight feature paths from PR #56 were replayed onto the exact current base. For every replayed file, the resulting blob equals the old #56 source blob exactly:

• CHANGELOG.md → 9d7d8707cf7dc5a29e6f03b65d26f14ef5f62984
• docs/adr/0003-reproducible-release-evidence.md → ffbb08884fbaa4a0b1e0eaa44415a935ee1a76c3
• docs/doctoring/reproducible-release-evidence.md → d1df1aded161ef8682efbe19b95661f0afc09be2
• docs/superpowers/plans/2026-08-06-release-evidence-dirfd-hardening.md → 056cf6ca039f6752d67197b44ea96e0bae7d1cd4
• docs/superpowers/specs/2026-08-06-release-evidence-dirfd-hardening-design.md → 0d7ec80335871eb71a7d38895b971ddd4734c11e
• pg_llm_batch/release_evidence.py → f301dc2205a34291108f1d30e3ecde39c714b696
• tests/test_release_evidence_dirfd.py → 90bbb8a11b19deb90ca51cf1a53a190e8342aa6e
• tests/test_release_evidence_dirfd_documentation.py → 7cf0bd34c0a148ebebb85339d40ebda38347409c

This preserves the reviewed #56 feature content while incorporating the nine independent prerequisite commits through ancestry rather than through stale synthetic evidence.

Validation contract

Keep this PR Draft and do not merge it. Require fresh exact-head CI and Release Acceptance on this exact head/base. If those gates fail, perform RCA before any further mutation. If validation succeeds, this head may be used only as a verified reconciliation candidate for the existing #56 branch after a fresh writer-lease and rollback check. Existing PR #56 must then receive its own fresh exact-head checks; this PR's evidence is not reused as final #56 acceptance evidence.

After the original #56 branch is safely reconciled and independently revalidated, close this temporary validation PR as superseded. No version bump, release, publication, attestation, permission expansion, temporary workflow, or external dependency mutation is introduced.

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[seonghobae]

Closing as superseded by the safely reconciled original PR #56. This draft served only as a bounded feasibility/validation surface: exact head 00d8d4405943094ac717020eaaae79c3aba88537 was proven 8 ahead / 0 behind exact base 49ef42cb93dd8b05e532f41638851cefb461b908, with byte-identical #56 feature blobs, CI 31281335941 success, and Release Acceptance 31281335905 success. After a fresh writer-lease check, the original #56 branch was reconciled to the same validated head and received its own fresh CI 31281414050 and Release Acceptance 31281414023, both successful. No evidence from this temporary PR is being reused as final merge acceptance.