Add CodeBoarding architecture analysis

[ivanmilevtues]

This PR adds the CodeBoarding GitHub Action via two workflows:

• codeboarding-sync.yml — on every push to your default branch, commits
  .codeboarding/analysis.json (your architecture baseline + readable docs). This is
  what the CodeBoarding viewer opens.
• codeboarding.yml — on every pull request, posts an architecture-diff comment and
  uploads that PR’s analysis as a build artifact for the viewer’s PR diff.

Both are needed: sync produces the baseline; review diffs against it.

Works out of the box

Just merge it — the Action runs on the free tier, with no extra setup. The
id-token: write permission lets it identify your repo to CodeBoarding’s hosted LLM,
metered per account against a weekly limit.

Want more, or unmetered, usage?

Add an LLM provider key — OpenRouter (OPENROUTER_API_KEY), Anthropic, OpenAI, Google,
AWS Bedrock, etc. — or a CODEBOARDING_LICENSE, as a repository secret under
Settings → Secrets and variables → Actions, then pass it to the action via llm_api_key
(+ llm_provider) or license_key. See the
provider list. Optional —
the free tier needs nothing.

— opened for you by CodeBoarding

[github-actions]

Architecture review · analyzing…

⏳ CodeBoarding is analyzing the architecture changes in this PR. This usually takes a few minutes.

_{codeboarding-action · run 27624233954}