chore: prepare the 2.8.1 release

[bagowix]

Summary

Prepare the 2.8.1 patch release.

• Bump the package version from 2.8.0 to 2.8.1.
• Move the current [Unreleased] changelog entries into [2.8.1] - 2026-09-18,
  keeping the Added-before-Fixed order every other section uses.
• Update the changelog comparison links, and the release version on the
  comparison page. The month there already reads September.
• Regenerate docs/llms-full.txt.

Patch, not minor: the release adds no public API. griffe check interlock --search . reports the VERSION attribute (2.8.0 → 2.8.1) as the only
difference. The Agent Skill from #205 ships under skills/, and the packaging
fix changes what the sdist carries. This follows 2.6.1, which was a patch
although its Added section held the Open Graph tags, the Search Console
verification and the README diagram — all outside the library surface.

What reaches a user:

• The Agent Skill (feat: ship an Agent Skill for adding breakers with coding agents #205). npx skills add bagowix/interlock installs a
  procedure for adding breakers into Claude Code, Cursor, Codex, GitHub Copilot
  and Gemini CLI. Until this release the PyPI page said nothing about it: feat: ship an Agent Skill for adding breakers with coding agents #205
  landed after 2.8.0, so the published long description still ends at the
  comparison table.
• The source distribution no longer carries the Hypothesis example
  database. The release job runs the tests before uv build, and Hypothesis
  leaves .hypothesis/ in the checkout. Git ignores it through the nested
  .gitignore Hypothesis writes there; hatchling reads only the root one, so
  the cache shipped. The published 2.8.0 sdist has .hypothesis/ at its top
  level; a local build of this branch, with the cache present in the checkout,
  has none.

Checklist

• Tests added or updated (suite stays at 100% coverage) — 851 passed, 2 skipped, coverage 100.00%
• uv run ruff format --check and uv run ruff check pass
• uv run mypy, uv run pyright and uv run pyrefly check pass
• Docs updated (docs/) for user-facing changes — comparison table and the regenerated llms-full.txt
• CHANGELOG.md [Unreleased] updated — dated as [2.8.1], links updated
• Commits follow Conventional Commits

Additional release checks: the package builds (interlock_cb-2.8.1), twine check PASSED on both artefacts, and the sdist carries no .hypothesis/ entry.

Related issues

Releases #205 and the packaging fix that followed it.

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📥 Commits

Reviewing files that changed from the base of the PR and between aa03551 and 08edc06.

📒 Files selected for processing (4)

• CHANGELOG.md
• docs/comparison.md
• docs/llms-full.txt
• interlock/version.py

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[codspeed]

Merging this PR will not alter performance

✅ 28 untouched benchmarks

---

_{Comparing release/2.8.1 (08edc06) with main (aa03551)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[context7]

Docs7 for bagowix/interlock

Result	Status	Action
Deployment	➖ Not used	—
Content review	❌ Needs attention. 2 problems remain.	View findings

Commit 08edc06

Show findings in this comment

Broken links (2)

• CHANGELOG.md:1000 — Unreleased compare link 404s until the v2.8.1 tag exists; push the tag with this release.
• CHANGELOG.md:1001 — 2.8.1 compare link points at the not-yet-created v2.8.1 tag; 404 until the tag is pushed.