feat(#985): intel command cutover — commands-only capability, last first-party family (ADR-857 phase 4d-impl-4) (#988)

* feat(#985): intel command cutover — commands-only capability, last first-party family (ADR-857 phase 4d-impl-4)

Migrate the intel CLI command family from a hardcoded gsd-tools.cjs case arm to
a registry-dispatched Capability (commandFamilies mechanism, #961), mirroring
the graphify (#972) and audit (#984) cutovers. New src/intel-command-router.cts
exports routeIntelCommand reproducing all 9 subcommands verbatim (incl. the
status timeAgo non-raw post-processing), lazily requiring intel.cjs inside the
route fn. capabilities/intel/capability.json declares the intel command family;
commands-only (skills:[]), declares the existing intel.enabled gate (default
false — behavior unchanged).

Behavior-CHANGING (dispatch path) but equivalence-proven: CLI output identical;
existing intel.test.cjs passes unchanged. Completes the first-party command-
family cutover sequence (graphify/audit/intel).

Closes #985

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* test(#985): compute expected planningDir via path.join in intel cutover unit tests (Windows CI)

The intel-command-cutover unit-mock assertions hardcoded a POSIX `/.planning`
expectation while the router builds it with path.join(cwd, '.planning') →
backslashes on Windows, so the planningDir-arg assertions (query/status/diff/
snapshot/validate/update/api-surface) failed only on windows-latest CI. Compute
the expectation with path.join (cross-platform); production router unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

capabilities/intel/capability.json

@@ -0,0 +1,28 @@
+{
+  "id": "intel",
+  "role": "feature",
+  "title": "Codebase intelligence",
+  "description": "Code-intelligence store for codebase querying, diff, snapshot, and API-surface extraction; exposes `gsd-tools intel` subcommands (query, status, update, diff, snapshot, patch-meta, validate, extract-exports, api-surface) and backs `/gsd-map-codebase` and `gsd-intel-updater`.",
+  "tier": "full",
+  "requires": [],
+  "skills": [],
+  "agents": [],
+  "config": {
+    "intel.enabled": {
+      "type": "boolean",
+      "default": false,
+      "description": "Enable the intel code-intelligence command."
+    }
+  },
+  "commands": [
+    {
+      "family": "intel",
+      "module": "intel-command-router.cjs",
+      "router": "routeIntelCommand"
+    }
+  ],
+  "hooks": [],
+  "steps": [],
+  "contributions": [],
+  "gates": []
+}