Add CHANGELOG.md tracking the pattern release history

Keep-a-Changelog format. 1.0.0 is today's consolidated release; earlier
entries backfilled from git history (0.1.0 through 0.4.0). Concept
inception noted as 2026-01-20 (first published on snapsynapse.com).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: snapsynapse

CHANGELOG.md

@@ -0,0 +1,123 @@
+# Changelog
+
+All notable changes to the **Knowledge as Code** template and pattern definition.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project
+adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). The pattern itself is
+versioned alongside the reference template — `v1.0` of the template implements `v1.0` of the
+pattern.
+
+> **Concept inception: 2026-01-20.** Sam Rogers first published the Knowledge as Code concept on
+> [snapsynapse.com](https://snapsynapse.com/insights/knowledge-as-code/) after confirming prior-art
+> checks. Code followed two months later.
+
+## [Unreleased]
+
+_Nothing yet._
+
+## [1.0.0] — 2026-04-09
+
+The 1.0 release. Consolidates the repo into a single-branch layout where the landing page, the
+generated reference demo, and the raw source markdown all live at the same domain. Ships the
+canonical pattern definition at <https://knowledge-as-code.com/>.
+
+### Added
+- **Canonical landing page** at `knowledge-as-code.com/` — hand-written `index.html` covering
+  what the pattern is, why it matters, a reference implementation (AITool.watch), a "see the
+  pattern in action" split between the built demo and the raw markdown source, three production
+  "built with" cards, and a four-step getting-started guide.
+- **`/demo/`** — the generated reference site built from the example data, served at
+  `knowledge-as-code.com/demo/` so visitors can see the pattern in action without cloning.
+- **Raw source served at the same domain** — `data/examples/*.md` and `project.yml` now serve as
+  `text/markdown` and `text/yaml` directly from `knowledge-as-code.com`, enabling the landing's
+  "left column is input, right column is output, same URL" demonstration.
+- **`.nojekyll` at repo root** to prevent GitHub Pages from processing markdown files, so raw
+  `.md` sources serve as text.
+- **JSON-LD structured data** (`TechArticle` + `DefinedTerm` + `Organization`) staking the term
+  and grounding E-E-A-T signals.
+- **Dated byline + `v1.0` version badge + CC-BY-4.0 license link** visible in the landing hero.
+- **`sitemap.xml`, `robots.txt`, `404.html`, `/imgs/og.png`** at repo root — full SEO surface.
+- **Open Graph + Twitter card metadata** for social sharing.
+- **"Built with Knowledge as Code" section** featuring three production sites: aitool.watch,
+  everyailaw.com, and meetings.snapsynapse.com.
+- **Self-healing verification** — `.github/workflows/verify.yml` now opens a GitHub issue when
+  `verify.js` detects stale or missing entities, or comments on the existing open drift issue to
+  prevent duplicate alerts across weekly runs. Includes an auto-created `knowledge-drift` label.
+- **IDE-style brand mark** — `{knowledge-as-code}` in Courier with syntax-highlighted braces
+  (amber), identifiers (emerald), and hyphens (muted).
+- **`KAC_OUTPUT_DIR` and `KAC_SITE_URL` env-var overrides** in `build.js` for repos that need to
+  build the same project at a different path or URL (used by this repo to build `/demo/`).
+- **GitHub repo metadata**: 15 topics (up from 3) and an updated description emphasizing
+  self-healing, agent-accessible, and zero-dependency traits.
+
+### Changed
+- **Deployment model** — GitHub Pages now serves from `main` branch root instead of an
+  auto-generated `gh-pages` branch. Pushing to `main` is the deploy. No more `peaceiris/actions-gh-pages`
+  step; no more hidden build-artifact branch.
+- **Workflow (`build.yml`)** — renamed to `CI`, runs `validate.js` and `build.js` as sanity
+  checks on push/PR with no deploy step. Permissions reduced to `contents: read`.
+- **`project.yml`** — fixed trailing-slash handling on `url` so concatenated canonical URLs
+  resolve correctly (`https://example.com/foo` instead of `https://example.comfoo`).
+- **Repo description** updated to *"A template for building structured, self-healing,
+  agent-accessible knowledge bases. Zero dependencies. Git-native. Ontology-driven. Multi-output."*
+
+### Removed
+- **`gh-pages` branch** — deleted on 2026-04-09 after the `main`-branch deploy was verified end-to-end.
+- **`/docs/` folder** — tracked static assets (CSS, JS, 404, CNAME, `.nojekyll`) moved to
+  repo root or `/demo/` as appropriate. The folder is no longer referenced by the workflow or Pages.
+- **`/site/` folder** — an earlier blue-themed landing draft that was never wired into deployment.
+  Removed.
+- **Orphan `/index.html` + `/sitemap.xml` + `/robots.txt` at repo root** (from a brief earlier
+  iteration) — now properly integrated.
+
+### Fixed
+- **Custom domain `knowledge-as-code.com`** — configured for the first time. GitHub Pages custom
+  domain set, DNS verified (four apex A records to `185.199.108-111.153` + `www` CNAME to
+  `snapsynapse.github.io`), HTTPS certificate provisioned and enforced through 2026-06-24. A
+  ghost claim on the domain (held by a previous GreenGeeks parking) was released as part of
+  the release process.
+
+## [0.4.0] — 2026-04-06
+
+### Added
+- Sortable tables in the generated site.
+- `llms.txt`, `agents.json`, and RSS feed at `/index.xml` for machine discovery.
+- `GitHub Sponsors` link in `SPONSORS.md`.
+- `noindex` on thin bridge pages to improve SEO signal density.
+
+### Fixed
+- Upstream/downstream entity navigation in the generated reference pages.
+
+## [0.3.0] — 2026-04-03
+
+### Added
+- Public template scaffolding — `README`, `CONTRIBUTING`, `LICENSE`, `ATTRIBUTION`.
+
+### Changed
+- **Ownership transferred from Snap Synapse to PAICE.work PBC.** All new attribution and
+  copyright lines point to PAICE.work PBC. The GitHub org name remains `snapsynapse` (repo URL
+  unchanged).
+- Live example URLs in the README updated to reflect the three production deployments.
+
+## [0.2.0] — 2026-03-27
+
+### Added
+- `scripts/verify.js` — freshness / staleness checking based on `last_verified` frontmatter.
+- `mcp-server.js` — Model Context Protocol server exposing the knowledge base as agent tools
+  dynamically generated from `project.yml` entity configuration.
+- `VERIFICATION.md` contributor documentation.
+- Open Graph image for social sharing.
+
+## [0.1.0] — 2026-03-25
+
+### Added
+- Initial template scaffolding: `project.yml` ontology config, `scripts/build.js` config-driven
+  site generator, `scripts/validate.js` cross-reference linter, example data for ISO 27001 and
+  NIST CSF, dark/light themed static site output, JSON API, bridge pages, `CNAME` fixture.
+
+[Unreleased]: https://github.com/snapsynapse/knowledge-as-code-template/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/snapsynapse/knowledge-as-code-template/releases/tag/v1.0.0
+[0.4.0]: https://github.com/snapsynapse/knowledge-as-code-template/releases/tag/v0.4.0
+[0.3.0]: https://github.com/snapsynapse/knowledge-as-code-template/releases/tag/v0.3.0
+[0.2.0]: https://github.com/snapsynapse/knowledge-as-code-template/releases/tag/v0.2.0
+[0.1.0]: https://github.com/snapsynapse/knowledge-as-code-template/releases/tag/v0.1.0