fix(codex): wait for plugin sync before loading skills

[THEKINGJEZE]

What

• wait for Codex remote-plugin materialisation before provider skill discovery
• force a fresh skill scan before starting or resuming a Codex thread
• cover the request order in provider and session-runtime tests

Why

Codex app-server materialises enabled remote plugins asynchronously after initialisation. T3 read skills/list immediately and cached that incomplete snapshot for both the skill picker and new threads. Remote-plugin materialisation does not emit skills/changed, so affected sessions remained incomplete.

plugin/installed provides a readiness barrier. After it resolves, skills/list with forceReload: true returns the complete installed skill set.

Verification

• focused provider tests: 3 files, 53 tests passed
• formatting check passed
• lint passed with pre-existing unrelated warnings only
• server typecheck passed with pre-existing suggestions only
• production build passed
• isolated macOS app: full quit/reopen, 14/14 Superpowers 6.1.1 skills visible in the $ picker
• fresh thread injected the complete bodies and exact installed paths for:
  • superpowers:systematic-debugging
  • superpowers:test-driven-development
  • superpowers:writing-plans
  • superpowers:verification-before-completion

The / picker remains the built-in command picker; skills are intentionally discovered through $.

Note

Wait for plugin sync before loading skills in Codex provider and session runtime

• Adds refreshCodexSkillsAfterPluginSync in CodexProvider.ts, which first awaits plugin/installed and then requests skills/list with forceReload=true.
• Updates probeCodexAppServerProvider to use this utility instead of calling skills/list directly.
• Updates openCodexThread in CodexSessionRuntime.ts to run the plugin sync + skills reload step before starting or resuming a thread.
• Behavioral Change: skills are now always fetched after plugin inventory is confirmed, adding two sequential RPCs (plugin/installed then skills/list) to both the probe and thread-open paths.

^{Macroscope summarized 6364b63.}

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