fix(catalog): provides.commands 3→4 (schedule only) + bump top-level updated_at

Surgical edit responding to two Copilot review nits on PR #2473.
Previous attempt used str.replace too broadly and was reverted —
this version uses unique anchors to mutate only the schedule
entry and the top-level updated_at field.

1. extensions/catalog.community.json schedule entry had
   provides.commands: 3, but the extension exposes 4 commands
   (run, portfolio, visualize, calibrate — calibrate was added
   in v0.6.0 Build 2 / calibration feedback loop).

2. Top-level catalog updated_at was 2026-05-06T22:28:55Z but
   per-entry updated_at for our schedule entry is 2026-05-07.
   Since this PR modifies the catalog, the top-level timestamp
   advances too.

Author: claude

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-05-07T05:51:00Z",
+  "updated_at": "2026-05-07T17:30:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -2095,7 +2095,7 @@
         "speckit_version": ">=0.4.0"
       },
       "provides": {
-        "commands": 3,
+        "commands": 4,
         "hooks": 1
       },
       "tags": [