chore: optimize CI — path filters, concurrency, skip release builds on PRs

[broomva]

Summary

• Concurrency groups added to both ci.yml and release.yml — superseded runs on the same branch are auto-cancelled, eliminating wasted minutes on rapid pushes
• Path filters on ci.yml pull_request trigger — PRs that only touch docs, markdown, or non-Rust files skip CI entirely
• Release builds gated with if: github.event_name != 'pull_request' — the 3-platform build matrix (linux-amd64, macos-amd64, macos-arm64) and Docker build no longer run on PRs
• workflow_dispatch added to ci.yml for manual trigger capability

Cost impact

Metric	Before	After
PR jobs	7 (check, test, pr-lint, control-audit, build x3, docker)	4 (check, test, pr-lint, control-audit + auto-merge)
Estimated PR CI time	~20 min	~5 min
Redundant runs on rapid push	All run to completion	Auto-cancelled

Files changed

• .github/workflows/ci.yml — concurrency, path filters, workflow_dispatch, build/docker gating
• .github/workflows/release.yml — concurrency group

Test plan

• Open a PR touching only .md files — CI should not trigger
• Open a PR touching .rs files — check, test, pr-lint, control-audit run; build matrix and docker do NOT run
• Push to master — all jobs including build matrix and docker run
• Push a tag v* — release.yml runs with concurrency group
• Rapidly push two commits to a PR branch — first run gets cancelled

Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 44d79de8-fec8-4736-8050-cf068e673e8a

📥 Commits

Reviewing files that changed from the base of the PR and between 3383063 and cac9827.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/ci-cost-optimization

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[railway-app]

🚅 Deployed to the symphony-pr-7 environment in symphony

Service	Status	Web	Updated (UTC)
symphony	❌ Build Failed (View Logs)	Web	Mar 25, 2026 at 3:22 am

2 services not affected by this PR

• postgres
• dashboard