Add baseline CI lanes

[arach]

Summary

• Add a baseline GitHub Actions CI workflow for PRs and pushes to main.
• Add package-level test scripts needed by the root test:unit lane.
• Add opt-in heavy CI lanes for native, packaged build, and runtime e2e work via labels or manual dispatch.

Notes

• Regular CI intentionally does not run on every codex/** branch push; PRs and main pushes are enough.
• The workflow uses the repo-pinned Bun version from packageManager.

Verification

• ruby -e 'require "yaml"; ARGV.each { |f| YAML.load_file(f); puts "ok #{f}" }' .github/workflows/ci.yml .github/workflows/heavy-ci.yml
• git diff --check
• bun run --cwd packages/protocol check
• bun run --cwd packages/session-trace check
• bun run --cwd packages/session-trace-react check
• bun run --cwd packages/session-trace test
• bun run --cwd packages/session-trace-react test

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
openscout	Skipped		May 29, 2026 4:27am

[arach]

Closing as superseded. The baseline CI lane work landed through #167/current main, and the remaining useful non-CI ask-routing/runtime pieces have been extracted into #170 without the stale workflow changes.