feat(opencode-go): add OpenCode Go plugin with tracking and limits

[praveenjuge]

Description

Adds a new plugin for OpenCode Go that tracks local spend against published plan limits.

Related Issue

#170

Type of Change

• Bug fix
• New feature
• New provider plugin
• Documentation
• Performance improvement
• Other (describe below)

Testing

• I ran bun run build and it succeeded
• I ran bun run test and all tests pass
• I tested the change locally with bun tauri dev

Screenshots

Checklist

• I read CONTRIBUTING.md
• My PR targets the main branch
• I did not introduce new dependencies without justification

---

Summary by cubic

Adds the opencode-go provider plugin to track local spend and show progress against 5h, weekly, and monthly limits. Fulfills #170.

• New Features

  • Detects via ~/.local/share/opencode/auth.json key or existing local history; hidden otherwise.
  • Reads ~/.local/share/opencode/opencode.db to sum assistant message cost; no cross-device or remote estimates.
  • Shows 5h, Weekly, Monthly progress vs limits $12/$30/$60; clamps at 100%.
  • Windows: 5h rolling; Weekly = UTC Mon→Mon; Monthly anchored to first local Go usage (fallback to calendar month).
  • Adds docs (docs/providers/opencode-go.md), README entry, and tests.

• Bug Fixes

  • Show a grey “Status: No usage data” badge when SQLite is unreadable or returns malformed JSON, while keeping the provider visible.

^{Written for commit 933ff2c. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 6 files

[davidarny]

@codex review

[Copilot]

Pull request overview

This PR adds a new "OpenCode Go" plugin that tracks local AI coding spend against published plan limits by reading from OpenCode's local SQLite database. Linked to issue #170 (which describes broader OpenCode integration), this PR focuses specifically on the Go plan with a local-history approach rather than the cookie-based dashboard parsing proposed in the issue.

Changes:

• New plugin (plugin.js, plugin.json, icon.svg) that reads OpenCode's local SQLite database and auth file to compute rolling 5-hour, weekly, and monthly usage as percentages of published dollar limits ($12/$30/$60)
• Comprehensive test suite covering detection, time-window aggregation, clamping, and graceful degradation on database failures
• Provider documentation and README entry for OpenCode Go

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
plugins/opencode-go/plugin.js	Core plugin logic: auth detection, SQLite history queries, time-window aggregation (5h rolling, weekly UTC Monday, anchored monthly), and progress line building
plugins/opencode-go/plugin.json	Plugin manifest with metadata, brand color, links, and line layout definition
plugins/opencode-go/plugin.test.js	Tests for detection, time-window calculations, edge cases, clamping, and soft fallback on DB errors
plugins/opencode-go/icon.svg	OpenCode logo SVG icon
docs/providers/opencode-go.md	Provider documentation covering detection, data source, limits, window rules, and failure behavior
README.md	Adds OpenCode Go to the supported providers list in alphabetical order

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 22a1719e36

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[davidarny]

LGTM!