feat: add OpenCode release automation

[terraboops]

Summary

Add automated OpenCode-compatible plugin release generation to the agentic marketplace workflow.

Changes

New Script: opencode-release.js

• Detects changed plugins from marketplace.json
• Parses conventional commits for changelog generation
• Creates zip packages with CHANGELOG.md and INSTALL.md
• Creates GitHub releases with semantic tags (<plugin-name>-vYYYY.MM.DD)

Action Updates: agentic-marketplace/generate/action.yml

• Add create-opencode-release input (default: false)
• Add release-version input for custom versioning
• Add OpenCode release step after marketplace generation
• Add releases-created output

Workflow Updates: agentic-marketplace.yml

• Pass through create-opencode-release and release-version inputs
• Enable OpenCode releases when configured

Build Updates: scripts/build.js

• Bundle opencode-release.js alongside discover-components.js
• Create opencode-release.cjs in dist/

Workflow

When create-opencode-release: true is set:

1. Marketplace generation runs as normal
2. After PR creation, detect changed plugins
3. For each changed plugin:
   • Compare against last release tag
   • Parse conventional commits (feat:, fix:, etc.)
   • Generate changelog and install guide
   • Create zip with plugin + docs
   • Create GitHub release with artifact

Release Format

Tags: bc-generate-sitrep-v2026.02.02

Artifacts: bc-generate-sitrep.zip containing:

• Plugin directory structure
• CHANGELOG.md (generated from commits)
• INSTALL.md (installation instructions)

Usage

In consuming repositories:

jobs:
  update:
    uses: bitcomplete/bc-github-actions/.github/workflows/agentic-marketplace.yml@v1
    with:
      create-opencode-release: true

Testing

• Script successfully bundles with esbuild
• Conventional commit parsing handles feat/fix/other
• Changelog generation formats markdown correctly
• Date-based versioning generates YYYY.MM.DD format