Add CodeBoarding architecture analysis

.github/workflows/codeboarding-sync.yml

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+name: CodeBoarding sync
+
+on:
+  push:
+    branches: ['main']
+    # Loop guard: don't re-trigger on the files this workflow itself commits.
+    # List generated files only: user-authored scope configuration must still trigger
+    # regeneration, while a merged sync PR must not trigger a loop.
+    paths-ignore:
+      - '.codeboarding/*.md'
+      - '.codeboarding/analysis.json'
+      - '.codeboarding/fingerprint.json'
+      - '.codeboarding/static_analysis.pkl'
+      - '.codeboarding/static_analysis.sha'
+      - '.codeboarding/codeboarding_version.json'
+      - '.codeboarding/health/health_report.json'
+      - 'docs/development/architecture.md'
+  workflow_dispatch:
+    inputs:
+      force_full:
+        description: 'Ignore the committed baseline and rebuild it from scratch (full analysis).'
+        type: boolean
+        required: false
+        default: false
+
+permissions:
+  contents: write   # commit the generated baseline + docs to the branch
+  id-token: write   # identifies this repo to CodeBoarding's hosted tier, used by the free
+                    # tier AND a license, and as the fallback until your own key exists
+
+concurrency:
+  # Serialize against itself so a push landing mid-run can't make two commits.
+  group: codeboarding-sync
+  cancel-in-progress: false
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: CodeBoarding/CodeBoarding-action@v1
+        with:
+          mode: sync
+          force_full: ${{ inputs.force_full || false }}
+          target_branch: 'main'
+          # CodeBoarding's free hosted tier. No secret to add: the run authenticates
+          # with the GitHub OIDC token that `id-token: write` above grants.
+          llm: hosted

.github/workflows/codeboarding.yml

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+name: CodeBoarding review
+
+on:
+  pull_request:
+    types: [opened, reopened, closed, synchronize]
+  issue_comment:
+    types: [created]
+
+# No workflow-level permissions: each job requests only what it needs (least
+# privilege), so the default token starts with none.
+permissions: {}
+
+concurrency:
+  group: codeboarding-${{ github.event.pull_request.number || github.event.issue.number }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' && github.event.action == 'closed' }}
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    permissions:
+      contents: read        # check out the repo + read the committed baseline (no writes in review mode)
+      pull-requests: write  # post the architecture-diff PR comment
+      issues: write         # the /codeboarding issue_comment trigger + comment API
+      id-token: write       # mint a GitHub OIDC token for the free hosted tier (write is the only level for id-token)
+      actions: read         # let a repeat review download the analysis an earlier run published, instead of re-deriving the whole PR
+    if: >
+      (github.event_name == 'pull_request' && github.event.action != 'closed' &&
+       github.event.pull_request.head.repo.full_name == github.repository) ||
+      (github.event_name == 'issue_comment' && github.event.issue.pull_request != null &&
+       startsWith(github.event.comment.body, '/codeboarding') &&
+       contains(fromJSON('["OWNER","MEMBER","COLLABORATOR"]'), github.event.comment.author_association))
+    steps:
+      - uses: CodeBoarding/CodeBoarding-action@v1
+        with:
+          # CodeBoarding's free hosted tier. No secret to add: the run authenticates
+          # with the GitHub OIDC token that `id-token: write` above grants.
+          llm: hosted