feat: add Ripple extension to community catalog

- Extension ID: ripple
- Version: 1.0.0
- Author: chordpli
- 3 commands (scan, resolve, check), 1 hook (after_implement)
- Delta-anchored side effect detection across 9 domain-agnostic categories

Author: chordpli

README.md

@@ -238,6 +238,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Repository Index | Generate index for existing repo for overview, architecture and module level. | `docs` | Read-only | [spec-kit-repoindex](https://github.com/liuyiyu/spec-kit-repoindex) |
 | Retro Extension | Sprint retrospective analysis with metrics, spec accuracy assessment, and improvement suggestions | `process` | Read+Write | [spec-kit-retro](https://github.com/arunt14/spec-kit-retro) |
 | Retrospective Extension | Post-implementation retrospective with spec adherence scoring, drift analysis, and human-gated spec updates | `docs` | Read+Write | [spec-kit-retrospective](https://github.com/emi-dm/spec-kit-retrospective) |
+| Ripple | Detect side effects that tests can't catch after implementation — delta-anchored analysis across 9 domain-agnostic categories | `code` | Read+Write | [spec-kit-ripple](https://github.com/chordpli/spec-kit-ripple) |
 | Review Extension | Post-implementation comprehensive code review with specialized agents for code quality, comments, tests, error handling, type design, and simplification | `code` | Read-only | [spec-kit-review](https://github.com/ismaelJimenez/spec-kit-review) |
 | SDD Utilities | Resume interrupted workflows, validate project health, and verify spec-to-task traceability | `process` | Read+Write | [speckit-utils](https://github.com/mvanhorn/speckit-utils) |
 | Security Review | Comprehensive security audit of codebases using AI-powered DevSecOps analysis | `code` | Read-only | [spec-kit-security-review](https://github.com/DyanGalih/spec-kit-security-review) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-04-17T02:00:00Z",
+  "updated_at": "2026-04-19T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -1492,6 +1492,38 @@
       "created_at": "2026-03-14T00:00:00Z",
       "updated_at": "2026-03-14T00:00:00Z"
     },
+    "ripple": {
+      "name": "Ripple",
+      "id": "ripple",
+      "description": "Detect side effects that tests can't catch after implementation — delta-anchored analysis across 9 domain-agnostic categories with fix-induced side effect detection",
+      "author": "chordpli",
+      "version": "1.0.0",
+      "download_url": "https://github.com/chordpli/spec-kit-ripple/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/chordpli/spec-kit-ripple",
+      "homepage": "https://github.com/chordpli/spec-kit-ripple",
+      "documentation": "https://github.com/chordpli/spec-kit-ripple/blob/main/README.md",
+      "changelog": "https://github.com/chordpli/spec-kit-ripple/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.2.0"
+      },
+      "provides": {
+        "commands": 3,
+        "hooks": 1
+      },
+      "tags": [
+        "side-effects",
+        "post-implementation",
+        "analysis",
+        "quality",
+        "risk-detection"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-04-19T00:00:00Z",
+      "updated_at": "2026-04-19T00:00:00Z"
+    },
     "refine": {
       "name": "Spec Refine",
       "id": "refine",