Enable OpenCode skill discovery in composer flow

[Jay1]

Summary

• Enables OpenCode composer capabilities to advertise supportsSkillDiscovery: true and supportsSkillMentions: true so the web composer can request skill discovery for OpenCode.
• Adds listSkills implementation to apps/server/src/provider/Layers/OpenCodeAdapter.ts with defensive normalization for OpenCode runtime skill metadata (consoleState.skills) from array/object/string forms and optional legacy/legacy-disabled fields.
• Normalizes skill descriptors with stable name, fallback opencode://skill/<name> path when missing, description, interface fields (displayName, shortDescription), enabled/scope, and robust handling of missing/invalid metadata.
• Adds focused OpenCode adapter tests in apps/server/src/provider/Layers/OpenCodeAdapter.test.ts covering:
  • capability advertisement
  • array-form skills metadata
  • keyed/object-form metadata including short-form string aliases
  • missing metadata fallback to empty list
• Adds planning/design documentation for implementation in docs/superpowers/plans/2026-05-28-opencode-skill-discovery.md and docs/superpowers/specs/2026-05-28-opencode-skill-discovery.md.
• Branches: base main, head jcode/surface-skills-first-class.

Testing

• Not run (no test commands executed in this step).
• Suggested checks:
  • bun run --cwd apps/server test src/provider/Layers/OpenCodeAdapter.test.ts
  • Focused web composer checks (if needed): validate OpenCode skill menu trigger/selection behavior after capability flags are enabled.
  • LSP diagnostics on touched TypeScript files
  • Any relevant security scan for changed files (per repo process).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7b76bef3-c030-4fdc-8d45-9c8005d8c313

📥 Commits

Reviewing files that changed from the base of the PR and between fe226ff and 508785d.

📒 Files selected for processing (4)

• apps/server/src/provider/Layers/OpenCodeAdapter.test.ts
• apps/server/src/provider/Layers/OpenCodeAdapter.ts
• docs/superpowers/plans/2026-05-28-opencode-skill-discovery.md
• docs/superpowers/specs/2026-05-28-opencode-skill-discovery-design.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jcode/surface-skills-first-class

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