opencode env: TITO support, tunnel sync stop, add terminal-bench

[rasdani]

Description

• supports TITO now by buffering/faking streaming
• uses new sync_stop to reliably shut down tunnels
• adds terminal-bench tasks and convenient env arg to run it

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

---

Note

Medium Risk
Moderate risk: changes the request/response interception and streaming behavior used during agent rollouts, which could affect tool-call/streaming compatibility and error handling; the rest is mostly additive task content and dependency/config updates.

Overview
Adds a large set of new opencode_harbor task assets (Dockerfiles/instructions/solutions/tests) for Terminal-Bench, and updates load_environment() to accept a dataset selector (terminal-bench or terminal-bench-sample) that expands into predefined task lists.

Updates the sandbox CLI interception flow to always fetch model responses via the non-streaming base path (to support TITO), and when an agent requests streaming it now synthesizes SSE chunks from the completed ChatCompletion via new synthesize_stream().

Tweaks infra/config: pre-commit excludes environments/*/tasks/ from linting, bumps prime-tunnel to >=0.1.1 and switches teardown to PrimeTunnel.sync_stop(), and adds an rl optional dependency set plus uv build hints for flash-attn.

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