feat(opencode): add opencode-go support

[aaronflorey]

Summary

Add OpenCode Go provider tracking to onWatch. OpenCode Go (from opencode.ai) provides AI code completion through the Claude Code CLI ecosystem with a subscription-based quota model.

Changes

• New provider: opencodego — cookie-based auth, scrapes usage from opencode.ai's dashboard
• Three quota windows: Rolling, Weekly, Monthly (with reset timers and rate-limit status)
• Config: OPENCODEGO_COOKIE (required) + OPENCODEGO_WORKSPACE_ID (optional, skips workspace resolution)
• Dashboard: Full card + both-chart views with per-window color mapping
• Store & tracker: Snapshot persistence, reset cycle detection, per-window summaries
• Agent: Background polling with notification support

Setup

Set OPENCODEGO_COOKIE to the opencode_session cookie value from opencode.ai. Optionally set OPENCODEGO_WORKSPACE_ID to skip automatic workspace resolution.

Files

internal/api/opencodego_client.go       # HTTP client (dashboard scraping)
internal/api/opencodego_types.go        # Types + parsing
internal/api/opencodego_types_test.go   # Parsing tests
internal/agent/opencodego_agent.go      # Polling agent
internal/tracker/opencodego_tracker.go  # Usage tracker
internal/store/opencodego_store.go      # SQLite persistence
internal/config/config.go               # Config + env vars
internal/web/handlers.go               # API endpoints
internal/web/static/app.js             # Dashboard charts
main.go                                # Wiring

[codecov]

Codecov Report

❌ Patch coverage is 14.37457% with 1239 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/web/handlers.go	0.76%	381 Missing and 6 partials ⚠️
internal/store/opencodego_store.go	0.00%	209 Missing ⚠️
internal/api/opencodego_client.go	0.00%	205 Missing ⚠️
internal/api/opencodego_types.go	46.26%	174 Missing and 13 partials ⚠️
internal/tracker/opencodego_tracker.go	0.00%	116 Missing ⚠️
internal/agent/opencodego_agent.go	0.00%	93 Missing ⚠️
main.go	14.28%	15 Missing and 9 partials ⚠️
internal/store/store.go	75.00%	6 Missing and 6 partials ⚠️
internal/config/config.go	40.00%	4 Missing and 2 partials ⚠️

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