feat(opencode): add roll-call command

[cbrunnkvist]

Issue for this PR

Closes #13711

Type of change

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

What does this PR do?

Adds a roll-call command for testing matching text models for connectivity and latency. This is extremely useful once you have several model providers / gateways connected and / or you are debugging multi-agent configs and want to make sure your model-keys are correct.

Sub-command options:

• Regex filtering
• Custom test-prompt
• Timeout control
• Parallelism control

Output features:

• Compact, width-aware human table with readable errors
• Structured JSON/Markdown output with detailed error fields
• Progress on stderr and results on stdout
• TTY colors, verbose/quiet modes, ANSI sanitization

How did you verify your code works?

• Focused roll-call tests pass: 8 tests, 41 assertions.
• bun typecheck passes from packages/opencode.
• Prettier check passes.
• git diff --check passes.
• CLI smoke checks were attempted, but local startup was blocked by unrelated database initialization and models.dev network access before the command handler ran.

A screenshot says more than ...

Checklist

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