docs: seed CHANGELOG.md (Keep-a-Changelog format) (#73)

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 +1,70 @@
+<!--
+SPDX-License-Identifier: MPL-2.0
+SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell (hyperpolymath)
+-->
+
+# Changelog
+
+All notable changes to `stapeln` 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(svalinn): ReScript→AffineScript/typed-wasm migration (phase 1) (#46)
+- feat(launcher): migrate to launch-scaffolder (server-url, port 4010)
+- feat: cross-platform launcher, product vision doc, manifest disambiguation
+- feat(crg): add crg-grade and crg-badge justfile recipes
+- feat: add Phase 3 simulation engine — build sim, what-if, supply chain
+- feat: JWT refresh tokens — access/refresh pair, refresh endpoint
+- feat: migrate cerro-torre MVP tools from Python to Julia
+
+### Fixed
+
+- fix(licence): clear scaffold-placeholder leak (Tranche 3) (#55)
+- fix(cerro-torre): String-bridge — discharge 3 ImporterProofs postulates (#53)
+- fix(cerro-torre): prove chainCommutative — resolve 2026-04-19 regression (#52)
+- fix(affine): migrate record literals to #{ } (affinescript#218) (#54)
+- fix(ci): sync hypatia-scan.yml to canonical (kill cd-scanner build drift) (#51)
+- fix: vordr 1.86 builder + repair A2ML/trufflehog/Hypatia CI checks (#41)
+- fix(cerro-torre): make the full Ada container build compile end-to-end (#42)
+- fix(svalinn): repair ReScript build + stabilise pre-existing CI checks (#40)
+- fix(container-stack): repair clean-build breakages + add podman smoke CI (#37)
+- fix(ci): move secret-scanner Cargo.toml gate from job-level if: to step-level (#36)
+
+### Documentation
+
+- docs: add implementation-subtree READMEs and READINESS file (CRG D→C)
+- docs(stapeln): add Haiku/Sonnet/Opus session briefs for todo execution
+- docs(cerro-torre): record chainCommutative regression + 2026-04-19 proof-build-restored pass
+- docs: update TEST-NEEDS.md with session 9 test additions
+- docs: add M2 estate audit report (2026-04-04)
+- docs: substantive CRG C annotation (EXPLAINME.adoc)
+- docs: update STATE with 2026-04-03 session work
+- docs: document ed25519Correctness type signature weakness
+- docs: add BibTeX bibliography for logic-driven container security paper
+
+### CI
+
+- ci(gitignore): ignore generated/* artefacts (Refs standards#93) (#60)
+- ci(spark): adopt estate SPARK Theatre Gate (standards#135) (#57)
+- ci(proof): add GitHub formal-verification gate for cerro-torre (#56)
+- ci: re-adopt hyperpolymath/a2ml-validate-action (Closes #44) (#50)
+- ci: fix three repo-wide failing checks at the root (A2ML, trufflehog, Hypatia) (#43)
+
+## 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). -->