fix: keep goal commands pending across execution cycles

[danyel117]

Summary

Keep registered /goal and /resume_goal commands pending across automatic executions until the goal stops, so a compatible ACP adapter can keep the client active. Older hosts without session.wait preserve their admission behavior.

Related issue

Related to #59. Persistent plans and the separate OpenCode ACP event-consumer integration follow this slice.

Changes

• Release the wait on cancellation, completion, limits, replacement, disabled continuation, and plugin disposal.
• Isolate the Promise-only Effect 3 persistence runtime under the external effect-goal-state npm alias. Modern OpenCode owns Effect 4 in the SDK namespace; the bare import prevented loading. No Effect values cross the SDK boundary.

Verification

Lint, typecheck, build, npm pack dry run, 349 passing Bun tests, and native isolated ACP /goal with an automatic continuation through overall completion. No user state was used.

Checklist

• bun run test passes (new behavior has regression coverage)
• bun run lint passes
• bun run typecheck passes
• bun run build passes and dist/server.js is committed
• README/docs updated

Merging to main automatically publishes a new patch release to npm.

Chain Context

• Strategy: stacked PRs, each usable independently.
• Position: 1 of 2. Base: main; starts at 8e71666.
• Ends with: goal command lifetime and modern host runtime compatibility.
• Dependency: none. Follow-up: persistent goal plans.
• Review budget: 385 changed lines / 400, including generated server.
• Rollback: revert this slice's command wait and dependency alias together.

main
 └── 📍 goal command lifetime
      └── persistent plans and ACP metadata