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?

The workflows already wire two repository secrets — just add whichever you have under
Settings → Secrets and variables → Actions and the next run picks it up (no YAML edit):

• OPENROUTER_API_KEY — your own OpenRouter key (BYO key).
• CODEBOARDING_LICENSE — a CodeBoarding paid plan (unmetered).

For a non-OpenRouter provider (Anthropic, OpenAI, Google, AWS Bedrock, …) see the
provider list. Both are
optional — leave them unset and the free tier runs with nothing configured.

— 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 29347746331}