Add canon extension and canon-core preset. (#2022)

* Add canon extension and canon-core preset.

* fix: correct branch and link references for spec-kit-canon catalog entries

- Fix documentation/changelog URLs using `main` → `master` branch in extension and preset catalogs
- Fix preset display link label from `spec-kit-canon-core` → `spec-kit-canon` in README

* chore: refresh community catalog timestamps

* chore: refresh canon extension command count

* chore: point canon catalog entries to repo root instead of subdirectories

---------

Co-authored-by: Manfred Riem <15701806+mnriem@users.noreply.github.com>

README.md

@@ -185,6 +185,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | AI-Driven Engineering (AIDE) | A structured 7-step workflow for building new projects from scratch with AI assistants — from vision through implementation | `process` | Read+Write | [aide](https://github.com/mnriem/spec-kit-extensions/tree/main/aide) |
 | Archive Extension | Archive merged features into main project memory. | `docs` | Read+Write | [spec-kit-archive](https://github.com/stn1slv/spec-kit-archive) |
 | Azure DevOps Integration | Sync user stories and tasks to Azure DevOps work items using OAuth authentication | `integration` | Read+Write | [spec-kit-azure-devops](https://github.com/pragya247/spec-kit-azure-devops) |
+| Canon | Adds canon-driven (baseline-driven) workflows: spec-first, code-first, spec-drift. Requires Canon Core preset installation. | `process` | Read+Write | [spec-kit-canon](https://github.com/maximiliamus/spec-kit-canon/tree/master/extension) |
 | Checkpoint Extension | Commit the changes made during the middle of the implementation, so you don't end up with just one very large commit at the end | `code` | Read+Write | [spec-kit-checkpoint](https://github.com/aaronrsun/spec-kit-checkpoint) |
 | Cleanup Extension | Post-implementation quality gate that reviews changes, fixes small issues (scout rule), creates tasks for medium issues, and generates analysis for large issues | `code` | Read+Write | [spec-kit-cleanup](https://github.com/dsrednicki/spec-kit-cleanup) |
 | Conduct Extension | Orchestrates spec-kit phases via sub-agent delegation to reduce context pollution. | `process` | Read+Write | [spec-kit-conduct-ext](https://github.com/twbrandon7/spec-kit-conduct-ext) |
@@ -241,6 +242,7 @@ The following community-contributed presets customize how Spec Kit behaves — o
 | Preset | Purpose | Provides | Requires | URL |
 |--------|---------|----------|----------|-----|
 | AIDE In-Place Migration | Adapts the AIDE extension workflow for in-place technology migrations (X → Y pattern) — adds migration objectives, verification gates, knowledge documents, and behavioral equivalence criteria | 2 templates, 8 commands | AIDE extension | [spec-kit-presets](https://github.com/mnriem/spec-kit-presets) |
+| Canon Core | Adapts original Spec Kit workflow to work together with Canon extension | 2 templates, 8 commands | — | [spec-kit-canon](https://github.com/maximiliamus/spec-kit-canon) |
 | Pirate Speak (Full) | Transforms all Spec Kit output into pirate speak — specs become "Voyage Manifests", plans become "Battle Plans", tasks become "Crew Assignments" | 6 templates, 9 commands | — | [spec-kit-presets](https://github.com/mnriem/spec-kit-presets) |
 | VS Code Ask Questions | Enhances the clarify command to use `vscode/askQuestions` for batched interactive questioning. | 1 command | — | [spec-kit-presets](https://github.com/fdcastel/spec-kit-presets) |
 

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-04-03T12:35:01Z",
+  "updated_at": "2026-04-06T06:30:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -106,6 +106,41 @@
       "created_at": "2026-03-03T00:00:00Z",
       "updated_at": "2026-03-03T00:00:00Z"
     },
+    "canon": {
+      "name": "Canon",
+      "id": "canon",
+      "description": "Adds canon-driven (baseline-driven) workflows: spec-first, code-first, spec-drift. Requires Canon Core preset installation.",
+      "author": "Maxim Stupakov",
+      "version": "0.1.0",
+      "download_url": "https://github.com/maximiliamus/spec-kit-canon/releases/download/v0.1.0/spec-kit-canon-v0.1.0.zip",
+      "repository": "https://github.com/maximiliamus/spec-kit-canon",
+      "homepage": "https://github.com/maximiliamus/spec-kit-canon",
+      "documentation": "https://github.com/maximiliamus/spec-kit-canon/blob/master/README.md",
+      "changelog": "https://github.com/maximiliamus/spec-kit-canon/blob/master/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.4.3"
+      },
+      "provides": {
+        "commands": 16,
+        "hooks": 0
+      },
+      "tags": [
+        "process",
+        "baseline",
+        "canon",
+        "drift",
+        "spec-first",
+        "code-first",
+        "spec-drift",
+        "vibecoding"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-03-29T00:00:00Z",
+      "updated_at": "2026-03-29T00:00:00Z"
+    },
     "checkpoint": {
       "name": "Checkpoint Extension",
       "id": "checkpoint",

presets/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-04-04T00:00:00Z",
+  "updated_at": "2026-04-06T06:30:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/presets/catalog.community.json",
   "presets": {
     "aide-in-place": {
@@ -29,6 +29,30 @@
         "aide"
       ]
     },
+    "canon-core": {
+      "name": "Canon Core",
+      "id": "canon-core",
+      "version": "0.1.0",
+      "description": "Adapts original Spec Kit workflow to work together with Canon extension.",
+      "author": "Maxim Stupakov",
+      "download_url": "https://github.com/maximiliamus/spec-kit-canon/releases/download/v0.1.0/spec-kit-canon-core-v0.1.0.zip",
+      "repository": "https://github.com/maximiliamus/spec-kit-canon",
+      "homepage": "https://github.com/maximiliamus/spec-kit-canon",
+      "documentation": "https://github.com/maximiliamus/spec-kit-canon/blob/master/README.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.4.3"
+      },
+      "provides": {
+        "templates": 2,
+        "commands": 8
+      },
+      "tags": [
+        "baseline",
+        "canon",
+        "spec-first"
+      ]
+    },
     "pirate": {
       "name": "Pirate Speak (Full)",
       "id": "pirate",