fix(3735): add surface to PROFILES.core (restore ADR-0011 expand contract) (#3744)

* test(3735): add failing test that PROFILES.core includes surface

Regression test asserting that resolveProfile({ modes: ['core'] }) includes
'surface' in its transitive closure — the ADR-0011 contract that --profile=core
users can expand via /gsd:surface enable <cluster>. Also updates stale
hardcoded skill-count assertions (7→8) across install-minimal*.test.cjs and
install-profiles-resolve.test.cjs to reflect the correct post-fix baseline.

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

* fix(3735): add 'surface' to PROFILES.core to restore ADR-0011 expand contract

PROFILES.core omitted 'surface', silently breaking the documented contract
in ADR-0011 that --profile=core users can expand their skill surface via
/gsd:surface enable <cluster>. The sub-command is only available if surface.md
is staged — which requires it to appear in the resolved set for the core profile.

Added 'surface' to both PROFILES.core and PROFILES.standard (standard is a
documented superset of core; omitting it from standard would break the
"standard must include all core skills" invariant and the resolveProfile tests).

The MINIMAL_SKILL_ALLOWLIST back-compat shim is derived from PROFILES.core so
it picks up surface automatically, ensuring --minimal and --core-only installs
also stage surface.md.

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

* chore(3735): update changeset to reference PR #3744

The fix commit landed with the linked-issue number as the pr: field
placeholder. Updating to the actual PR number now that the PR is open.

* docs(install-profiles): fix stale 'six skills' count in module header comment

After #3735 added surface to PROFILES.core the skill count became eight,
but the module-level comment still said "six skills covering the main project
loop". Update the description to reflect the correct count and reference the
ADR-0011 expand contract that surface fulfils.

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

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/bug-3735-profiles-core-includes-surface.test.cjs

@@ -0,0 +1,49 @@
+'use strict';
+/**
+ * Regression test for #3735: PROFILES.core must include 'surface' in its
+ * resolved closure so that --profile=core users can expand via
+ * /gsd:surface enable <cluster> — the advertised use-case from ADR-0011.
+ *
+ * Stage 2 (RED): This test must fail before the fix is applied.
+ * Stage 3 (GREEN): This test must pass after 'surface' is added to PROFILES.core.
+ */
+
+const { test, describe } = require('node:test');
+const assert = require('node:assert/strict');
+const path = require('path');
+
+const {
+  PROFILES,
+  resolveProfile,
+  loadSkillsManifest,
+} = require('../get-shit-done/bin/lib/install-profiles.cjs');
+
+const REAL_COMMANDS_DIR = path.join(__dirname, '..', 'commands', 'gsd');
+
+describe('PROFILES.core — ADR-0011 expand contract', () => {
+  test("PROFILES.core includes 'surface' so users can expand via /gsd:surface enable", () => {
+    const manifest = loadSkillsManifest(REAL_COMMANDS_DIR);
+    const result = resolveProfile({ modes: ['core'], manifest });
+
+    assert.ok(result.skills instanceof Set,
+      'resolveProfile must return a skills Set for core profile');
+
+    // The primary assertion: surface must be in the resolved closure.
+    // ADR-0011 documents that --profile=core users expand via /gsd:surface enable <cluster>.
+    // That sub-command is only available if surface.md is staged — which requires it to be
+    // in the resolved set for the core profile.
+    assert.ok(result.skills.has('surface'),
+      `PROFILES.core resolved closure must include 'surface'; got: [${[...result.skills].sort().join(', ')}]`);
+  });
+
+  // Counter-test: 'forensics' is NOT in core — proves the assertion above is selective,
+  // not vacuously true for all skills.
+  test("PROFILES.core does NOT include 'forensics' (selective assertion counter-check)", () => {
+    const manifest = loadSkillsManifest(REAL_COMMANDS_DIR);
+    const result = resolveProfile({ modes: ['core'], manifest });
+
+    assert.ok(result.skills instanceof Set);
+    assert.ok(!result.skills.has('forensics'),
+      `'forensics' should NOT be in core closure — it is a specialist skill, not a core loop skill`);
+  });
+});