chore(053): label taxonomy + move community files into .github/ (WP-A1, A3)

[Dumbris]

Part of spec 053 — OSS Repo Improvements (Track A quick wins). One of ~3 PRs splitting the remaining OSS-report backlog.

WP-A1 · Kubernetes-style label taxonomy

• Adds version-controlled .github/labels.yml (37 labels): kind/* (9), area/* (12, tailored to this repo — proxy/oauth/docker/tray/web-ui/cli/storage/search/teams/telemetry/build-ci/packaging), priority/* (4), triage/* (5), size/* (5), plus the GitHub defaults good first issue and help wanted. Coherent per-family color scheme; every label has a description.
• Adds .github/workflows/label-sync.yml using crazy-max/ghaction-github-labeler (its native config format is .github/labels.yml). Triggers on push to main (path-filtered) + workflow_dispatch. Least-privilege perms (contents: read, issues: write).

⚠️ First-sync behavior: the workflow runs with skip-delete: false, so the first sync makes labels.yml the source of truth and deletes the 7 default GitHub labels not in the taxonomy (bug, documentation, duplicate, enhancement, invalid, question, wontfix — note good first issue/help wanted are retained). This is intentional for a clean taxonomy; flagging so it's not a surprise. Flip to skip-delete: true if you'd rather prune manually.

WP-A3 · Move remaining community files into .github/ (root −2)

• git mv CODE_OF_CONDUCT.md .github/ — GitHub auto-detects the CoC in .github/, community profile stays green.
• git mv .golangci.yml .github/.golangci.yml. golangci-lint does not auto-detect config in .github/, so every invocation now passes --config .github/.golangci.yml: unit-tests.yml (golangci-lint-action args:), scripts/run-linter.sh, Makefile lint target, and the docs/development/testing.md example. Linter behavior + package set unchanged; verified golangci-lint run is clean against the new path.
• Root tracked-file count: 17 → 15.

Conventions

• New actions are SHA-pinned (actions/checkout@…v4.3.1, crazy-max/ghaction-github-labeler@…v6.0.0) per the Scorecard Pinned-Dependencies push in the sibling security PR; dependabot (github-actions ecosystem, already configured) keeps them current.

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