Add Spec Roadmap extension to community catalog (#3153)

Add roadmap extension submitted by @srobroek to:
- extensions/catalog.community.json (alphabetical order)
- docs/community/extensions.md community extensions table

Closes #3150

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docs/community/extensions.md

@@ -118,6 +118,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Spec Orchestrator | Cross-feature orchestration — track state, select tasks, and detect conflicts across parallel specs | `process` | Read-only | [spec-kit-orchestrator](https://github.com/Quratulain-bilal/spec-kit-orchestrator) |
 | Spec Reference Loader | Reads the ## References section from the feature spec and loads only the listed docs into context | `docs` | Read-only | [spec-kit-spec-reference-loader](https://github.com/KevinBrown5280/spec-kit-spec-reference-loader) |
 | 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 Roadmap | Capture a durable spec roadmap after the constitution, then review specs against it before and after implementation so spec-specific decisions, outcomes, and constraints are never lost. | `process` | Read+Write | [speckit-roadmap](https://github.com/srobroek/speckit-roadmap) |
 | Spec Scope | Effort estimation and scope tracking — estimate work, detect creep, and budget time per phase | `process` | Read-only | [spec-kit-scope-](https://github.com/Quratulain-bilal/spec-kit-scope-) |
 | 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) |
 | Spec Trace | Build a requirement → test traceability matrix from spec.md and the test suite — surface untested requirements and orphan tests | `code` | Read+Write | [spec-kit-trace](https://github.com/Quratulain-bilal/spec-kit-trace) |

extensions/catalog.community.json

@@ -2995,6 +2995,40 @@
       "created_at": "2026-04-20T00:00:00Z",
       "updated_at": "2026-04-20T00:00:00Z"
     },
+    "roadmap": {
+      "name": "Spec Roadmap",
+      "id": "roadmap",
+      "description": "Capture a durable spec roadmap after the constitution, then review specs against it before and after implementation so spec-specific decisions, outcomes, and constraints are never lost.",
+      "author": "srobroek",
+      "version": "0.1.0",
+      "download_url": "https://github.com/srobroek/speckit-roadmap/archive/refs/tags/v0.1.0.zip",
+      "repository": "https://github.com/srobroek/speckit-roadmap",
+      "homepage": "https://github.com/srobroek/speckit-roadmap",
+      "documentation": "https://github.com/srobroek/speckit-roadmap/blob/main/README.md",
+      "changelog": "https://github.com/srobroek/speckit-roadmap/blob/main/CHANGELOG.md",
+      "license": "Apache-2.0",
+      "category": "process",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=0.11.6"
+      },
+      "provides": {
+        "commands": 4,
+        "hooks": 3
+      },
+      "tags": [
+        "roadmap",
+        "planning",
+        "governance",
+        "review",
+        "spec-alignment"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-06-24T00:00:00Z",
+      "updated_at": "2026-06-24T00:00:00Z"
+    },
     "schedule": {
       "name": "Spec Kit Schedule — CP-SAT Agent Orchestrator",
       "id": "schedule",