feat(CC-0003): add minimal GitHub Actions CI workflow

[berendt]

• Add CI workflow (.github/workflows/ci.yaml) triggered on push
  to main and on all pull requests
• Add lint job using golangci-lint-action v2.10 with 10min timeout
• Add test job running make test with 15min timeout
• Source Go version from go.work via actions/setup-go
• Pin all GitHub Actions to commit SHAs for supply-chain security
• Set least-privilege permissions (contents: read) at workflow level
• Configure per-branch concurrency groups with cancel-in-progress
• Add SPDX Apache-2.0 license header matching project conventions
• Add reference documentation for CI workflow (docs/reference/)

[sourcery-ai]

Reviewer's Guide

Adds a minimal GitHub Actions CI workflow for Go projects with lint and test jobs, pinned action SHAs, least-privilege permissions, concurrency controls, and accompanying reference documentation and planwerk metadata updates.

Sequence diagram for CI workflow execution on GitHub events

sequenceDiagram
  actor Developer
  participant GitHub
  participant Workflow_CI
  participant Job_lint
  participant Job_test
  participant Runner_lint
  participant Runner_test

  Developer->>GitHub: Push to main or open/update PR
  GitHub->>Workflow_CI: Trigger workflow on push or pull_request

  Workflow_CI->>Workflow_CI: Apply permissions contents: read
  Workflow_CI->>Workflow_CI: Apply concurrency group github.ref-github.workflow

  par Run lint job
    Workflow_CI->>Job_lint: Start job lint (timeout 10m)
    Job_lint->>Runner_lint: Provision ubuntu-latest runner
    Runner_lint->>Runner_lint: Run actions/checkout@34e1148
    Runner_lint->>Runner_lint: Run golangci-lint-action@1e7e51e
    Runner_lint-->>Job_lint: Lint results
  and Run test job
    Workflow_CI->>Job_test: Start job test (timeout 15m)
    Job_test->>Runner_test: Provision ubuntu-latest runner
    Runner_test->>Runner_test: Run actions/checkout@34e1148
    Runner_test->>Runner_test: Run actions/setup-go@40f1582 with go-version-file go.work
    Runner_test->>Runner_test: Execute make test
    Runner_test-->>Job_test: Test results
  end

  Job_lint-->>Workflow_CI: Job status (success/failure)
  Job_test-->>Workflow_CI: Job status (success/failure)
  Workflow_CI-->>GitHub: Combined CI status
  GitHub-->>Developer: CI checks reported on commit or PR

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File-Level Changes

Change	Details	Files
Introduce a minimal GitHub Actions CI workflow with lint and test jobs for the Go codebase.	Create CI workflow triggered on pushes to main and on all pull_request events Define parallel lint and test jobs with separate timeouts and no inter-job dependencies Configure lint job to run golangci-lint via golangci-lint-action with version v2.10 Configure test job to run make test using Go version sourced from go.work via actions/setup-go	.github/workflows/ci.yaml
Harden the CI workflow with security-focused and operational safeguards.	Pin all GitHub Actions to specific commit SHAs for supply-chain security Set top-level least-privilege permissions for GITHUB_TOKEN (contents: read) Configure per-branch concurrency groups with cancel-in-progress to avoid redundant runs Add SPDX Apache-2.0 license header in the workflow file following project conventions	.github/workflows/ci.yaml
Document the CI workflow behavior and record planwerk progress/review metadata.	Add reference documentation describing the CI workflow triggers, jobs, Go setup, concurrency, and permissions Update planwerk progress JSON to reflect implementation of this feature Add initial planwerk review JSON entry for this change	docs/reference/ci-workflow.md .planwerk/progress/CC-0003-a003-add-minimal-github-actions-ci-workflow.json .planwerk/reviews/CC-0003-a003-add-minimal-github-actions-ci-workflow-review-1.json

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[sourcery-ai]

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