docs: seed CHANGELOG.md (Keep-a-Changelog format)

[hyperpolymath]

Closes Row-2 Phase 3 of the 2026-05-26 estate tech-debt audit chain for this repo. The 2026-05-26 documentation-debt audit (hyperpolymath/standards#197) flagged that 180 of 279 estate repos lacked a CHANGELOG.md (65% gap) — this seed closes that finding here.

The seed:

• Uses Keep-a-Changelog format with an [Unreleased] section.
• Buckets the most recent 100 commits by conventional-commit prefix (feat/fix/refactor/docs/ci/build) into Added/Fixed/Changed/ Documentation/CI sections.
• References standards#206's changelog-reusable.yml + the canonical templates/cliff.toml for full-regeneration via git-cliff.

The file is initial — the maintainer can adopt changelog-reusable.yml in this repo's CI to keep it auto-regenerated, or regenerate manually.

Summary

Closes #

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (would change existing behaviour)
• 🕳️ Soundness fix (fixes a checker/proof false-negative)
• 📖 Documentation
• 🧹 Refactor / tech debt (behaviour-preserving)
• ⚡ Performance
• 🔧 Build / CI / tooling

How has this been verified?

Checklist

• My commits are signed (git commit -S).
• I ran the project's own checks/tests locally and they pass.
• New files carry the correct SPDX-License-Identifier (code/config MPL-2.0,
  prose CC-BY-SA-4.0); I did not relicense existing files.
• Docs are updated, and no public claim now overstates what the code does.
• I have not introduced a soundness hole (or I have flagged where I might have).

Notes for reviewers

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Code Review ✅ Approved 2 resolved / 2 findings

Seeds the initial CHANGELOG.md using the Keep-a-Changelog format to address documentation debt. Consider updating the license header to CC-BY-SA-4.0 for prose and adding the missing [Unreleased] link-reference definition.

Auto-approved and auto-merge armed: No blocking issues found.
Please see Auto-approve Docs for details on setting custom approval criteria. — merges when pipeline and required approvals pass.

✅ 2 resolved

✅ Quality: CHANGELOG uses MPL-2.0 but PR convention says prose is CC-BY-SA-4.0

📄 CHANGELOG.md:1-3
This PR's own checklist states new files must carry the correct SPDX identifier: code/config MPL-2.0, prose CC-BY-SA-4.0. A CHANGELOG is prose/documentation (the PR is tagged docs), yet line 2 declares SPDX-License-Identifier: MPL-2.0. This contradicts the stated estate convention; change the header to SPDX-License-Identifier: CC-BY-SA-4.0 to match the prose-licensing rule.

✅ Quality: [Unreleased] heading lacks a link-reference definition

📄 CHANGELOG.md:19
Keep a Changelog renders ## [Unreleased] as a hyperlink only when a matching link-reference definition (e.g. [Unreleased]: https://.../compare/...) is present at the bottom of the file. No such definition exists, so the brackets render as literal text. Either add the reference definition or drop the brackets to avoid a broken-looking link.

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