feat(tool): add interactive terminal tool with vscode auto-attach

[Albertban]

Issue for this PR

Closes #

Type of change

• New feature

What does this PR do?

Adds a terminal tool to opencode so the agent can open and drive a real interactive PTY (open/read/input/close), and adds VS Code extension support that auto-attaches those sessions into real VS Code terminals via a Pseudoterminal bridge.

Differs from the existing open PR #23794 on the same area by:

• Auto-attaching agent-created PTYs into VS Code terminals (watcher + "Attach Interactive Terminal" command + port discovery), so you can type passwords interactively instead of the non-TTY bash tool.
• Running the command through an explicit shell (powershell / cmd / bash, defaulting to PowerShell on Windows).
• Normalizing input line endings on Windows (\n -> \r) — before this, model-sent \n got stuck in PowerShell's continuation prompt and keystrokes appeared lost.
• Bundling the real extension icons (previous files were placeholder path references).

How did you verify your code works?

• bun typecheck passes in packages/opencode; tsc --noEmit passes in sdks/vscode.
• Verified create/read/input/close roundtrip against a live server, and that auto-attach pops the terminal in VS Code and echoes input both ways.

Screenshots / recordings

N/A (no UI change beyond the auto-attached terminal).

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 PR Found:

• PR feat(tool): add interactive terminal tool with persistent PTY sessions #23794: "feat(tool): add interactive terminal tool with persistent PTY sessions"
  • feat(tool): add interactive terminal tool with persistent PTY sessions #23794

Why it's related:
The PR description explicitly mentions that this PR (#41449) differs from #23794 on the same area. The main differences are:

• Auto-attaching to VS Code terminals instead of just creating PTYs
• Explicit shell selection (powershell/cmd/bash)
• Windows line ending normalization
• Real extension icons bundling

This appears to be an enhancement/alternative approach to the existing terminal tool work in #23794, not a true duplicate, but they are closely related features addressing the same problem space.

[Albertban]

This is the currently open implementation of an interactive erminal tool for the agent (the earlier #23794 and its rebased successor #41554 are both closed).

Scope of this PR (5 commits):

• New erminal tool (open/read/input/close) backed by the existing Pty service.
• VS Code extension: auto-attach agent-created PTYs to real VS Code terminals (watcher + Attach Interactive Terminal command + port discovery), so keystrokes/passwords work interactively.
• Explicit shell selection (powershell/cmd/bash) and Windows line-ending normalization (\n -> \r) that previously made model-sent input appear lost.
• Real icons for the extension.

If maintainers prefer folding the tool part into another design, happy to adjust; the VS Code auto-attach piece is the part we'd like to keep either way. Thanks for the review.