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

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 +1,75 @@
+<!--
+SPDX-License-Identifier: MPL-2.0
+SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell (hyperpolymath)
+-->
+
+# Changelog
+
+All notable changes to `http-capability-gateway` 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(perf): Phase D benchmark harness scaffold (standards#99 / #91 channel) (#12)
+- feat(policy): catalog mode — auto-policy from BoJ cartridge.json
+- feat(p2): bug fixes, unit tests, P2 productization docs
+- feat(p1): gateway hardening — bug fixes, concurrency tests, benchmarks, docs
+- feat(crg): add crg-grade and crg-badge justfile recipes
+- feat: add VeriSimDB async audit log client (capgw:audit)
+- feat: wire conflow config validation pipeline
+- feat: add k9iser.toml and generate K9 contracts
+- feat: add stapeln.toml layer-based container definition\n\nConverted from existing Containerfile to stapeln format.\nIncludes Chainguard base, security hardening, SBOM generation.\n\nCo-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
+- feat: deploy UX Manifesto infrastructure
+
+### Fixed
+
+- fix(ci): switch CodeQL language matrix to `actions` (#13)
+- fix(ci): bump a2ml/k9-validate-action pins to canonical (standards#85) (#7)
+- fix(ci): sync hypatia-scan.yml to canonical (kill cd-scanner build drift) (#6)
+- fix(ci): adopt canonical hypatia-scan.yml (env.HOME/scanner-layout + Comment-step gate) (#5)
+- fix(p0): resolve all 5 P0 release blockers
+- fix: set correct Groove capability type (was: custom)
+- fix: replace String.to_atom with String.to_existing_atom
+- fix(scorecard): enforce granular permissions and add fuzzing placeholder
+- fix(ci): Resolve workflow-linter self-matching and metadata issues
+- fix: global AGPL-3.0-or-later → PMPL-1.0-or-later replacement
+
+### Changed
+
+- perf(d-2): wire in-process loopback backend so proxy-200 scenario measures real dial-and-read (#14)
+- refactor: migrate 6SCM → 6A2 (.scm → .a2ml format)
+
+### Documentation
+
+- docs: record tech-debt audit findings (2026-05-26) (#16)
+- docs: substantive CRG C annotation (EXPLAINME.adoc)
+- docs: add TEST-NEEDS.md and/or PROOF-NEEDS.md from audit
+- docs: add comprehensive v2.0 roadmap for irresistible gateway
+- docs: add CONTRIBUTING.md
+- docs: add checkpoint files for state tracking
+
+### CI
+
+- ci: redistribute concurrency-cancel guard to read-only check workflows (#9)
+- ci: bump actions/upload-artifact SHA to current v4 (#4)
+- ci: SHA-pin hyperpolymath validate-actions in dogfood-gate
+- ci: wire hypatia-scan.yml to query own Dependabot alerts
+- ci: deploy dogfood-gate, add Groove manifest and CRG tests
+
+## 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). -->