Ship skills built-in: bundle the catalogue, assign per hire, force humanizer

Skills no longer come from the user's ~/.agents library - most users have
none, and the CEO branch that compiled the entire catalogue into its
prompt overflowed the model context (1.1MB) and failed every CEO run.

- Bundle "built-in skills/" with the app (extraResources) and stage it
  at startup into <profile>/builtin-skills as one dir-per-skill copy -
  both bundle shapes (SKILL.md dirs and flat category .md files)
  normalize into the same importable layout
- Import the staged catalogue per org at startup and inside onboarding,
  so the CEO's first run already carries it
- Forced house style: resolveRuntimeSnapshot unions the humanizer skill
  into every agent's runtime (CEO included) as a resolution rule - no
  binding row to forget, delete, or bypass; revoke_skill refuses it
- CEO staffs hires with skills: hire_agent accepts a skills array,
  grant_skill/revoke_skill adjust later, list_skills now shows
  descriptions from skill frontmatter
- Kill the c_suite compile-all branch; everyone resolves bindings-only,
  capped at 200k chars with omissions named in the prompt
- Remove the Skills settings page and its import/sync/test IPC surface;
  drop ~/.agents discovery and the AGENTCOMPANY_NEW_SKILLS_ROOT seam in
  favor of AGENTCOMPANY_NEW_BUILTIN_SKILLS_DIR
- Tests: staging/import/forced-resolution/cap units, real-bundle CI
  check, e2e asserts the tab is gone and the catalogue self-imports

built-in skills/integrations/github-copilot/README.md

@@ -0,0 +1,32 @@
+# GitHub Copilot Integration
+
+The Agency works with GitHub Copilot out of the box. No conversion needed —
+agents use the existing `.md` + YAML frontmatter format.
+
+## Install
+
+```bash
+# Copy all agents to your GitHub Copilot agents directories
+./scripts/install.sh --tool copilot
+
+# Or manually copy a category
+cp engineering/*.md ~/.github/agents/
+cp engineering/*.md ~/.copilot/agents/
+```
+
+## Activate an Agent
+
+In any GitHub Copilot session, reference an agent by name:
+
+```
+Activate Frontend Developer and help me build a React component.
+```
+
+```
+Use the Reality Checker agent to verify this feature is production-ready.
+```
+
+## Agent Directory
+
+Agents are organized into divisions. See the [main README](../../README.md) for
+the full current roster.