chore: add dependency-review + cargo-audit + commitlint workflows

.commitlintrc.json

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+{
+  "extends": ["@commitlint/config-conventional"],
+  "rules": {
+    "header-max-length": [2, "always", 100],
+    "body-max-line-length": [0, "always"],
+    "footer-max-line-length": [0, "always"],
+    "type-enum": [2, "always", [
+      "build", "chore", "ci", "docs", "feat", "fix",
+      "perf", "refactor", "revert", "style", "test"
+    ]]
+  }
+}

.github/workflows/cargo-audit.yml

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+name: cargo audit
+
+# RustSec advisory scan. Runs alongside the existing cargo-deny check in
+# ci.yml — deny enforces license + ban policy from deny.toml; audit fires
+# on the latest RustSec database so a new advisory against any transitive
+# dep surfaces in ≤ 1 CI run rather than waiting for the next manual sweep.
+#
+# Advisory findings (cargo audit exit 1) surface as PR check warnings,
+# non-blocking. Execution failures (exit 2+) fail the job — see the
+# explicit exit-code branching in the Run step below. Promote advisories
+# to blocking by removing that branch once the backlog is clean and new
+# findings can be actioned within SLO.
+# Ignore list mirrors deny.toml [advisories].ignore — keep them in sync.
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+  schedule:
+    # Daily at 04:00 UTC — surfaces freshly-published advisories without
+    # needing a PR to trigger the scan.
+    - cron: '0 4 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  audit:
+    name: cargo audit (advisory scan)
+    runs-on: ubuntu-22.04
+    env:
+      # Pin to a known-good cargo-audit so the security scan stays
+      # reproducible across runs. Bump intentionally via PR (so behaviour
+      # changes are reviewed, not silently picked up from latest-stable).
+      CARGO_AUDIT_VERSION: "0.22.1"
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+      - name: Install cargo-audit
+        run: cargo install cargo-audit --locked --version "$CARGO_AUDIT_VERSION"
+      - name: Run cargo audit
+        # Distinguish advisory findings (cargo audit exit 1, non-blocking
+        # warning) from tool execution failures (exit 2+, must fail the
+        # job). The previous `|| echo` swallowed both.
+        # Ignore list mirrors deny.toml [advisories].ignore — each ID
+        # has a documented reason there; if you add one here, add it
+        # there too.
+        run: |
+          set +e
+          cargo audit \
+            --ignore RUSTSEC-2024-0436 \
+            --ignore RUSTSEC-2025-0134
+          status=$?
+          set -e
+          case "$status" in
+            0) echo "no advisories" ;;
+            1) echo "::warning::cargo audit findings (non-blocking, see deny.toml for ignored IDs)" ;;
+            *) echo "::error::cargo audit execution failed with exit $status"; exit "$status" ;;
+          esac

.github/workflows/commitlint.yml

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+name: commitlint
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  commitlint:
+    name: commitlint
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        with:
+          fetch-depth: 0
+
+      - uses: wagoid/commitlint-github-action@b948419dd99f3fd78a6548d48f94e3df7f6bf3ed # v6
+        with:
+          configFile: .commitlintrc.json

.github/workflows/dependency-review.yml

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+name: Dependency review
+
+# Runs GitHub's dependency-review-action on PRs. Diffs the lockfile changes
+# in the PR vs the base branch and BLOCKS merge if newly-introduced
+# dependencies have vulnerabilities OR licenses outside our allowlist.
+#
+# Pair with Dependabot: Dependabot opens upgrade PRs; this gate enforces
+# nothing bad slips in through manual deps changes that bypass Dependabot.
+# Complements the existing `deny` job in ci.yml — that runs against the
+# full dep tree post-merge; this one runs against the diff pre-merge.
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  dependency-review:
+    name: Dependency review
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+
+      - uses: actions/dependency-review-action@2031cfc080254a8a887f58cffee85186f0e49e48 # v4
+        with:
+          fail-on-severity: high
+          # Mirror deny.toml [licenses].allow.
+          allow-licenses: MIT, Apache-2.0, Apache-2.0 WITH LLVM-exception, BSD-2-Clause, BSD-3-Clause, ISC, MPL-2.0, Unicode-DFS-2016, Unicode-3.0, CC0-1.0, Zlib, 0BSD, BUSL-1.1, CDLA-Permissive-2.0
+          allow-dependencies-licenses: pkg:githubactions/Swatinem/rust-cache
+          comment-summary-in-pr: on-failure