Add Spec Refine community extension to catalog and README

Adds the spec-kit-refine extension (4 commands, 2 hooks) that enables
iterative specification refinement — update specs in-place, propagate
changes to plan and tasks, diff impact, and track sync status.

Addresses community request in issue #1191 (101+ upvotes).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Quratulain-bilal

README.md

@@ -225,6 +225,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Superpowers Bridge | Orchestrates obra/superpowers skills within the spec-kit SDD workflow across the full lifecycle (clarification, TDD, review, verification, critique, debugging, branch completion) | `process` | Read+Write | [superpowers-bridge](https://github.com/RbBtSn0w/spec-kit-extensions/tree/main/superpowers-bridge) |
 | Ship Release Extension | Automates release pipeline: pre-flight checks, branch sync, changelog generation, CI verification, and PR creation | `process` | Read+Write | [spec-kit-ship](https://github.com/arunt14/spec-kit-ship) |
 | Spec Critique Extension | Dual-lens critical review of spec and plan from product strategy and engineering risk perspectives | `docs` | Read-only | [spec-kit-critique](https://github.com/arunt14/spec-kit-critique) |
+| Spec Refine | Update specs in-place, propagate changes to plan and tasks, and diff impact across artifacts | `process` | Read+Write | [spec-kit-refine](https://github.com/Quratulain-bilal/spec-kit-refine) |
 | Spec Sync | Detect and resolve drift between specs and implementation. AI-assisted resolution with human approval | `docs` | Read+Write | [spec-kit-sync](https://github.com/bgervin/spec-kit-sync) |
 | V-Model Extension Pack | Enforces V-Model paired generation of development specs and test specs with full traceability | `docs` | Read+Write | [spec-kit-v-model](https://github.com/leocamello/spec-kit-v-model) |
 | Verify Extension | Post-implementation quality gate that validates implemented code against specification artifacts | `code` | Read-only | [spec-kit-verify](https://github.com/ismaelJimenez/spec-kit-verify) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-04-06T06:30:00Z",
+  "updated_at": "2026-04-08T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -1067,6 +1067,38 @@
       "created_at": "2026-03-14T00:00:00Z",
       "updated_at": "2026-03-14T00:00:00Z"
     },
+    "refine": {
+      "name": "Spec Refine",
+      "id": "refine",
+      "description": "Update specs in-place, propagate changes to plan and tasks, and diff impact across artifacts.",
+      "author": "Quratulain-bilal",
+      "version": "1.0.0",
+      "download_url": "https://github.com/Quratulain-bilal/spec-kit-refine/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/Quratulain-bilal/spec-kit-refine",
+      "homepage": "https://github.com/Quratulain-bilal/spec-kit-refine",
+      "documentation": "https://github.com/Quratulain-bilal/spec-kit-refine/blob/main/README.md",
+      "changelog": "https://github.com/Quratulain-bilal/spec-kit-refine/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.4.0"
+      },
+      "provides": {
+        "commands": 4,
+        "hooks": 2
+      },
+      "tags": [
+        "refine",
+        "iterate",
+        "propagation",
+        "workflow",
+        "specifications"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-04-08T00:00:00Z",
+      "updated_at": "2026-04-08T00:00:00Z"
+    },
     "repoindex": {
       "name": "Repository Index",
       "id": "repoindex",