v0.3.0 — Codex continuation

Codex continuation

• Adds the optional grok-task-continuation Skill for per-task continuation after a Grok bridge job reaches a terminal state.
• Documents the scoped heartbeat flow: poll only known task IDs, review get_task evidence and limitations, then continue the originating Codex request under existing authority.
• Clarifies that this does not add a Worker or Grok Bot callback into arbitrary Codex conversations; external writes still require new authority.

Verification

• npm run check
• npm test
• npm run build
• Skill structure validation