feat: add OpenCode CLI provider

[maciej]

Summary

• add OpenCode as a first-class CLI provider across config, auto-fallback, model parsing, daemon discovery, and help/docs
• run opencode run --format json with stdin prompts, parse JSONL text/usage/cost output, and support cli/opencode plus configured default models
• wire OpenCode into attachment handling, chat/model metadata, Chrome settings hints, and regression tests

Testing

• npx pnpm -s test tests/llm.cli.test.ts tests/llm.cli.more-branches-2.test.ts tests/llm.provider-capabilities.test.ts tests/model-spec.test.ts tests/daemon.models.test.ts tests/asset.summary-attempts.test.ts tests/chrome.daemon-payload.test.ts tests/run.env.test.ts tests/run.models.test.ts tests/daemon.chat.test.ts
• npx pnpm -s typecheck
• npx pnpm -s format:check
• npx pnpm -s summarize --cli opencode --plain --length short --timeout 4m <smoke-test-url>

[maciej]

Follow-up fix is pushed in de7a7d37.

What changed:

• stabilized the sidepanel restore path by ignoring non-content active tabs like about:blank when resolving panel state
• added targeted OpenCode coverage around model selection, auto fallback, CLI cwd handling, provider capability parsing, and CLI availability

Local verification:

• pnpm -C apps/chrome-extension test:chrome --grep "sidepanel starts pending slides after returning to a tab with seeded placeholders" --repeat-each 10
• pnpm exec vitest run --coverage --exclude tests/options.skills-controller.test.ts -> branch coverage 75.01%
• OpenCode smoke checks passed for both stdin and a real URL via --model cli/opencode

[steipete]

Reviewed + landed.

Fixes on top before merge:

• restored OpenClaw branches/defaults during the stale-provider rebase so OpenCode landing does not regress existing CLI flows
• added missing OpenCode JSONL parser wiring in src/llm/cli-provider-output.ts
• fixed OpenCode arg ordering in src/llm/cli.ts so subcommand args stay under run
• updated changelog + README/auth notes

Verification:

• pnpm -s vitest run tests/llm.cli.test.ts tests/llm.cli.more-branches-2.test.ts tests/llm.provider-capabilities.test.ts tests/run.env.test.ts tests/run.models.test.ts tests/chrome.daemon-payload.test.ts tests/chrome.settings.test.ts tests/daemon.chat.test.ts tests/daemon.models.test.ts tests/model-spec.test.ts tests/model-auto.test.ts
• pnpm -s docs:list
• pnpm -s check

Branch pushed with follow-up commit: 04320c7b.
Rebased commits now: 675b2c0e, 2848bf9d, 04320c7b.

Thanks @maciej.