fix(cli): handle descendant permission asks

[eummo]

Issue for this PR

Closes#36868

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Headless opencode run only answered permission requests from the root session, so a Task child requesting permission blocked both sessions indefinitely.

This tracks descendants from session events and verifies missed sessions by following parentID. Descendant requests now use the existing --auto approve / non-auto reject policy. A failed ancestry lookup cancels the pending local request and makes a bounded best-effort server abort instead of leaving the CLI blocked.

Related: #35823. This version avoids session.list() pagination limits and adds a real Task-child subprocess regression.

How did you verify your code works?

• bun run typecheck in packages/opencode
• bun test test/cli/run/permission-session-tree.test.ts (4 pass, 0 fail)
• Prettier and oxlint on the changed files (no new warnings)
• bun run script/build.ts --single, CLI smoke test, and compiled CLI + fake LLM reproduction (parent completed and child marker was created)

The complete subprocess test file cannot run in this Windows checkout because Bun panics while importing its runtime fixture; the equivalent compiled-binary flow passed and the regression test is included for CI. The monorepo pre-push check is also blocked because the tracked app symlink is checked out as path text on Windows; the changed opencode package passes typecheck.

Screenshots / recordings

Not applicable; this changes headless CLI behavior.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Related PRs Found

While PR #36898 is the current PR being checked, here are related PRs that address similar or overlapping concerns:

1. #35823 - fix(cli): answer subagent permission asks in headless run

   • Directly related as mentioned in the PR description ("Related: fix(cli): answer subagent permission asks in headless run (#35073) #35823")
   • Earlier version that handled permission asks; this PR improves it with parentID fallback and end-to-end session-tree regression testing

2. #36046 - fix(tui): show permission prompts from nested subagent chains

   • Addresses UI handling of permission prompts from descendant/nested agents, complementary to the CLI handling in fix(cli): handle descendant permission asks #36898

These are evolutionary/related improvements to the same feature area. The current PR (#36898) specifically improves upon #35823 with better fallback handling and regression test coverage.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[github-actions]

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