fix(acp): sync native agent session titles

[swear01]

Summary

• consume native ACP session_info_update title events and sync them to HAPI session summaries
• refresh titles through native ACP session/list for agents that persist titles without pushing an update; retry placeholder titles asynchronously
• disable HAPI's change_title MCP tool for remote Cursor, OpenCode, and Kimi ACP sessions while preserving display_image
• remove the OpenCode remote title prompt; keep existing non-ACP title behavior unchanged

Why

Cursor now emits the standardized ACP title update directly. Current OpenCode and Kimi sources generate and persist native titles exposed by session/list, but do not emit session_info_update. HAPI previously discarded the pushed title field and relied on its own MCP fallback.

This makes native agent title state authoritative for ACP sessions and removes that fallback from all three remote ACP launchers.

Closes #838.

Validation

• bun typecheck
• bun run test
  • CLI: 124 files, 1219 tests passed
  • Hub: 472 passed, 3 skipped
  • Web: 144 files, 1183 tests passed
  • Shared: 106 passed
• focused ACP/title suite: 5 files, 63 tests passed
• live Cursor ACP smoke: native session_info_update title reached the HAPI summary bridge
• real MCP smoke: enableChangeTitle: false exposes only display_image

[github-actions]

Findings

• [Major] ACP title refresh can hold a completed turn busy for up to the transport timeout. refreshSessionInfo() calls session/list with the default 120s request timeout, and the launchers await it before their finally blocks clear thinking and emit ready (cli/src/cursor/cursorAcpRemoteLauncher.ts:257, cli/src/opencode/opencodeRemoteLauncher.ts:288, cli/src/kimi/kimiRemoteLauncher.ts:174). If an ACP build is slow or wedges on session/list, the user cannot send the next prompt for up to two minutes after the model already finished.
  Suggested fix:

  const response = await this.transport.sendRequest('session/list', { cwd }, { timeoutMs: 5000 });

  and keep refresh off the turn-critical path in each launcher:

  void backend.refreshSessionInfo(acpSessionId, session.path);

Summary

• Review mode: initial. Found one turn-readiness regression risk introduced by the ACP native title refresh path.

Testing

• Not run (automation)

HAPI Bot

[github-actions]

Findings
No issues found.

Summary
Review mode: follow-up after new commits. No issues found in the latest diff. Residual risk: ACP title sync depends on native ACP agent behavior for session_info_update and session/list; reviewed statically because tests could not run here.

Testing
Not run: bun is not installed in this runner (/bin/bash: bun: command not found).

HAPI Bot

[github-actions]

Findings
No issues found.

Summary
Review mode: follow-up after new commits. No issues found in the latest full PR diff. Residual risk: reviewed statically because the runner does not have Bun installed, so the new ACP title-sync tests and CLI typecheck could not be executed here.

Testing
Not run: bun is not installed in this runner (/bin/bash: bun: command not found).

HAPI Bot