docs: seed CHANGELOG.md (Keep-a-Changelog format) (#12)

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.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

CHANGELOG.md

@@ -0,0 +1,63 @@
+<!--
+SPDX-License-Identifier: MPL-2.0
+SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell (hyperpolymath)
+-->
+
+# Changelog
+
+All notable changes to `infrastructure-automation` will be documented in this file.
+
+This file is generated from conventional commits by the
+[`changelog-reusable.yml`](https://github.com/hyperpolymath/standards/blob/main/.github/workflows/changelog-reusable.yml)
+workflow (`hyperpolymath/standards#206`). Adopt the workflow in this repo's CI to keep this file in sync automatically — see
+[`templates/cliff.toml`](https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml)
+for the canonical config.
+
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/);
+this project aims to follow [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- feat(crg): add crg-grade and crg-badge justfile recipes
+- feat: add stapeln.toml container definition
+- feat: deploy UX Manifesto infrastructure
+- feat: add CLADE.a2ml — clade taxonomy declaration
+- feat: add mirror.yml workflow for GitLab/Bitbucket mirroring
+- feat: complete SaltStack to Ansible + Terraform migration
+
+### Fixed
+
+- fix(scorecard): enforce granular permissions and add fuzzing placeholder
+- fix(ci): Resolve workflow-linter self-matching and metadata issues
+- fix: correct email jonathan.jewell → j.d.a.jewell
+- fix: SPDX headers (AGPL→PMPL), email, author name
+- fix: suppress deprecation warnings for ansible-core 2.24
+- fix: resolve Silverblue compatibility issues across all roles
+- fix: use $((x + 1)) instead of ((x++)) in self-check
+
+### Changed
+
+- refactor: migrate 6SCM → 6A2 (.scm → .a2ml format)
+
+### Documentation
+
+- docs: substantive CRG C annotation (EXPLAINME.adoc)
+- docs: add EXPLAINME.adoc — prove-it file backing README claims
+- docs: add design change rationale for Salt to Ansible migration
+
+### CI
+
+- ci: deploy dogfood-gate, add Groove manifest and CRG tests
+- ci: migrate CodeQL Action v3 → v4
+- ci: update SHA pins for codeql-action and trufflehog
+- ci: deploy missing standard workflows (10 added)
+
+## Pre-history
+
+Prior commits to this file's introduction are recorded in git history but not formally classified into Keep-a-Changelog sections. To backfill, run `git cliff -o CHANGELOG.md` locally using the canonical [`cliff.toml`](https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml) — this is one-shot mechanical work.
+
+---
+
+<!-- This file was seeded by the 2026-05-26 estate tech-debt audit follow-up (Row-2 Phase 3); see [`hyperpolymath/standards/docs/audits/2026-05-26-estate-documentation-debt.md`](https://github.com/hyperpolymath/standards/blob/main/docs/audits/2026-05-26-estate-documentation-debt.md). -->