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>

get-shit-done/bin/lib/install-profiles.cjs

@@ -9,7 +9,7 @@
  * dropped skills when users stack multiple plugins (#3408).
  *
  * Profile model: three named profiles replace the old minimal/full binary:
- *  - core     — six skills covering the main project loop
+ *  - core     — eight skills covering the main project loop (includes surface for ADR-0011 expand contract)
  *  - standard — core + phase management and workspace skills
  *  - full     — all skills (previous default, '*' sentinel)
  * Profiles compose: --profile=core,audit resolves to union(closure(core), closure(audit)).
@@ -64,6 +64,7 @@ const PROFILES = Object.freeze({
     'phase',
     'help',
     'update',
+    'surface',
   ]),
   standard: Object.freeze([
     // Core loop
@@ -73,6 +74,7 @@ const PROFILES = Object.freeze({
     'execute-phase',
     'help',
     'update',
+    'surface',
     // Phase management (hot nodes from audit — required by 38+ skills)
     'phase',
     'review',