docs: seed CHANGELOG.md (Keep-a-Changelog format) (#60)

## Summary
Adds an initial `CHANGELOG.md` in Keep-a-Changelog format. Recent
commits are bucketed into Added/Fixed/Changed/Documentation/CI from
their conventional-commit prefixes.

Closes **Row-2 Phase 3** of the 2026-05-26 estate tech-debt audit chain
for this repo. The audit
([standards#197](hyperpolymath/standards#197))
flagged 180/279 repos missing CHANGELOG (65% gap).

## Adopting auto-regeneration
For ongoing auto-regeneration, adopt the
[`changelog-reusable.yml`](https://github.com/hyperpolymath/standards/blob/main/.github/workflows/changelog-reusable.yml)
workflow
([standards#206](hyperpolymath/standards#206))
in this repo's CI. Uses the canonical
[`templates/cliff.toml`](https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: hyperpolymath

CHANGELOG.md

@@ -0,0 +1,68 @@
+<!--
+SPDX-License-Identifier: MPL-2.0
+SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell (hyperpolymath)
+-->
+
+# Changelog
+
+All notable changes to `scripts` 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: migrate bookmark scripts from Python to Julia
+- feat: add stapeln.toml container definition
+- feat: deploy UX Manifesto infrastructure
+- feat: add CLADE.a2ml — clade taxonomy declaration
+- feat(ci): enable Hypatia scanning
+- feat: add hyperpolymath utility scripts
+
+### Fixed
+
+- fix(ci): sync hypatia-scan.yml to canonical (#47)
+- fix(ci): build Hypatia escript from repo root (estate dogfood drift)
+- fix(ci): Phase-2 fleet submission must not fail the security gate (#46)
+- fix(ci): move secret-scanner Cargo.toml gate from job-level if: to step-level (#45)
+- fix: replace deno -A with specific permission flags
+- 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(license): SPDX AGPL-3.0 → PMPL-1.0-or-later in dotfiles
+- fix: apply safety triangle fixes (recipe-heredoc-to-install,recipe-shell-quote-vars)
+
+### Changed
+
+- refactor: reboot-tracker.ts → .mjs (TS types stripped) (#42)
+- refactor: migrate 6SCM → 6A2 (.scm → .a2ml format)
+
+### Documentation
+
+- docs: add EXPLAINME.adoc — prove-it file backing README claims
+- docs: add CONTRIBUTING.md
+- docs: add checkpoint files for state tracking
+
+### CI
+
+- build(deps): bump dtolnay/rust-toolchain from efa25f7f19611383d5b0ccf2d1c8914531636bf9 to 3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 (#49)
+- build(deps): bump github/codeql-action from 4.32.6 to 4.36.0 (#50)
+- build(deps): bump actions/github-script from 8.0.0 to 9.0.0 (#51)
+- build(deps): bump trufflesecurity/trufflehog from 3.93.8 to 3.95.3 (#52)
+- build(deps): bump actions/upload-artifact from 4.6.2 to 7.0.1 (#53)
+
+## 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). -->