refactor: migrate Markdown to AsciiDoc

CHANGELOG.adoc

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+== Changelog
+
+All notable changes to `+nexia-list+` will be documented in this file.
+
+This file is generated from conventional commits by the
+https://github.com/hyperpolymath/standards/blob/main/.github/workflows/changelog-reusable.yml[`+changelog-reusable.yml+`]
+workflow (`+hyperpolymath/standards#206+`). Adopt the workflow in this
+repo’s CI to keep this file in sync automatically — see
+https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml[`+templates/cliff.toml+`]
+for the canonical config.
+
+The format follows https://keepachangelog.com/en/1.1.0/[Keep a
+Changelog]; this project aims to follow
+https://semver.org/spec/v2.0.0.html[Semantic Versioning].
+
+=== [Unreleased]
+
+==== Added
+
+* feat(crg): add crg-grade and crg-badge justfile recipes
+* feat: add stapeln.toml container definition
+* feat: add UX Justfile with doctor, tour, help-me, assail recipes
+* feat: deploy UX Manifesto infrastructure
+* feat(desktop): replace Tauri with Gossamer — gossamer-rs backend
+* feat: Gossamer migration — RuntimeBridge, gossamer.conf.json,
+Tauri→Gossamer conversion
+* feat: add CLADE.a2ml — clade taxonomy declaration
+* feat: add mirror.yml workflow for GitLab/Bitbucket mirroring
+* feat: add AI Gatekeeper Protocol manifest
+* feat(ci): enable Hypatia scanning
+
+==== Fixed
+
+* 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): build Hypatia escript from repo root (estate dogfood drift)
+* fix(ci): repair YAML block-scalar in workflow-linter Check Permissions
+step (#4)
+* fix(scorecard): enforce granular permissions and add fuzzing
+placeholder
+* fix(ci): Resolve workflow-linter self-matching and metadata issues
+* fix: RSR compliance — fix SPDX headers, resolve placeholders, rewrite
+stale SCM
+* fix: remove duplicate SCM files from root
+
+==== Changed
+
+* refactor: migrate 6SCM → 6A2 (.scm → .a2ml format)
+
+==== Documentation
+
+* docs: add post-audit status report for M5 sweep
+* docs: add TEST-NEEDS.md (CRG C)
+* docs: add EXPLAINME.adoc — prove-it file backing README claims
+* docs: update SCM files with project information
+* docs: add CODE_OF_CONDUCT.md
+* docs: add CONTRIBUTING.md
+* docs: add checkpoint files for state tracking
+* docs: update license from AGPL to PMPL
+
+==== CI
+
+* ci: redistribute concurrency-cancel guard to read-only check workflows
+(#9)
+* ci: bump actions/upload-artifact SHA to current v4 (#3)
+* ci: SHA-pin hyperpolymath validate-actions in dogfood-gate
+* ci: wire hypatia-scan.yml to query own Dependabot alerts
+* ci: deploy dogfood-gate, fix hypatia-scan, add pre-commit hooks
+
+=== 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
+https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml[`+cliff.toml+`]
+— this is one-shot mechanical work.
+
+'''''