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

CHANGELOG.md

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+<!--
+SPDX-License-Identifier: MPL-2.0
+SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell (hyperpolymath)
+-->
+
+# Changelog
+
+All notable changes to `ipv6-site-enforcer` 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: add RSR scaffolding and update manifest dependencies
+- feat: add FlatRacoon manifest, K8s deployment for NAT64/DNS64
+- feat: add AI Gatekeeper Protocol manifest
+- feat(ci): enable Hypatia scanning
+- feat: initial scaffolding for IPv6-only enforcement
+
+### Fixed
+
+- fix(licence): clear scaffold-placeholder leak (Tranche 2) (#35)
+- fix(ci): sync hypatia-scan.yml to canonical (413: env.HOME+Phase-2+SARIF) (#33)
+- fix(ci): adopt canonical hypatia-scan.yml (env.HOME/scanner-layout + Comment-step gate) (#31)
+- fix(ci): Phase-2 fleet submission must not fail the security gate (#30)
+- fix(codeql): switch language matrix to 'actions' (no JS/TS in repo) (#29)
+- fix: remove duplicate SCM files from root
+- fix(security): update editorconfig SHA and CodeQL language
+
+### Documentation
+
+- docs: record tech-debt audit findings (2026-05-26) (#41)
+- docs(readme): add SPDX header and/or standard badges
+- docs: add CONTRIBUTING.md
+- docs: add checkpoint files for state tracking
+- docs: update license from AGPL to PMPL
+
+### CI
+
+- ci: bump actions/upload-artifact SHA to current v4 (#27)
+- ci(secret-scanner): drop duplicate --fail from trufflehog extra_args (#26)
+- ci: fix workflow-linter YAML parse error + self-flag bug
+- ci: fix workflow-linter self-flag bug
+
+## 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). -->