fix: rewrite port file when session ID becomes available

[four-bytes-robby]

Port file now updated with session-scoped hash when setSessionId is called.

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Summary by cubic

Rewrite the status port file when a session ID is set, scoping it per session so clients reliably discover the correct port and avoid collisions. We hash the session ID to generate status-port-.json under ~/.cache/opencode/brain, write { port } only if a port is set, and create the directory if missing.

^{Written for commit d636098. Summary will update on new commits.}

Summary by CodeRabbit

• Chores
  • Improved session management infrastructure with enhanced discovery mechanisms.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

Walkthrough

In setSessionId, after updating _sessionId and _channel, a new block checks whether _port is already assigned. If so, it hashes the session id with SHA-256, derives a cache file path (status-port-<hash>.json), creates the cache directory, and writes { port: _port } to that file, ignoring any errors.

Changes

Session-scoped port discovery file persistence

Layer / File(s)	Summary
Port persistence inside setSessionId src/status.ts	Adds a conditional block that, when _port > 0 at the time setSessionId is called, hashes the session id, ensures the cache directory exists, and writes { port: _port } to a session-scoped JSON discovery file; errors are swallowed.

Estimated code review effort

3 (Moderate) | ~15 minutes

Possibly related PRs

• four-bytes/four-opencode-brain#141: Directly modifies src/status.ts with the same session-scoped status-port-<hash>.json discovery file mechanism, including the hash derivation and cache path logic that this PR's setSessionId change depends on.

Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description lacks required template sections including Related Issue, version bump confirmation, HISTORY.md update status, and build/test verification checkboxes specified in the repository template.	Complete all required checklist items from the template: confirm conventional commit format, add Related Issue reference, verify bun test and build pass, confirm version and HISTORY.md updates, and check for personal paths.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: rewriting a port file when the session ID becomes available, which directly aligns with the changeset that adds session-scoped port file persistence in setSessionId.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Finishing Touches

Generate docstrings

• Create stacked PR
• Commit on current branch

Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/set-session-port-file

Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/set-session-port-file

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