feat: add PolicyPackSelectorComponent with tests and integration

- Implemented PolicyPackSelectorComponent for selecting policy packs.
- Added unit tests for component behavior, including API success and error handling.
- Introduced monaco-workers type declarations for editor workers.
- Created acceptance tests for guardrails with stubs for AT1–AT10.
- Established SCA Failure Catalogue Fixtures for regression testing.
- Developed plugin determinism harness with stubs for PL1–PL10.
- Added scripts for evidence upload and verification processes.

.gitea/workflows/signals-evidence-locker.yml

@@ -0,0 +1,64 @@
+name: signals-evidence-locker
+on:
+  workflow_dispatch:
+    inputs:
+      retention_target:
+        description: "Retention days target"
+        required: false
+        default: "180"
+
+jobs:
+  prepare-signals-evidence:
+    runs-on: ubuntu-latest
+    env:
+      MODULE_ROOT: docs/modules/signals
+      OUT_DIR: evidence-locker/signals/2025-12-05
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build deterministic signals evidence tar
+        run: |
+          set -euo pipefail
+          test -d "$MODULE_ROOT" || { echo "missing $MODULE_ROOT" >&2; exit 1; }
+
+          tmpdir=$(mktemp -d)
+          rsync -a --relative \
+            "$OUT_DIR/SHA256SUMS" \
+            "$OUT_DIR/confidence_decay_config.sigstore.json" \
+            "$OUT_DIR/unknowns_scoring_manifest.sigstore.json" \
+            "$OUT_DIR/heuristics_catalog.sigstore.json" \
+            "$MODULE_ROOT/decay/confidence_decay_config.yaml" \
+            "$MODULE_ROOT/unknowns/unknowns_scoring_manifest.json" \
+            "$MODULE_ROOT/heuristics/heuristics.catalog.json" \
+            "$tmpdir/"
+
+          (cd "$tmpdir/$OUT_DIR" && sha256sum --check SHA256SUMS)
+
+          tar --sort=name --mtime="UTC 1970-01-01" --owner=0 --group=0 --numeric-owner \
+            -cf /tmp/signals-evidence.tar -C "$tmpdir" .
+
+          sha256sum /tmp/signals-evidence.tar > /tmp/signals-evidence.tar.sha256
+
+      - name: Upload artifact (fallback)
+        uses: actions/upload-artifact@v4
+        with:
+          name: signals-evidence-2025-12-05
+          path: |
+            /tmp/signals-evidence.tar
+            /tmp/signals-evidence.tar.sha256
+
+      - name: Push to Evidence Locker
+        if: ${{ secrets.CI_EVIDENCE_LOCKER_TOKEN != '' && env.EVIDENCE_LOCKER_URL != '' }}
+        env:
+          TOKEN: ${{ secrets.CI_EVIDENCE_LOCKER_TOKEN }}
+          URL: ${{ env.EVIDENCE_LOCKER_URL }}
+        run: |
+          curl -f -X PUT "$URL/signals/2025-12-05/signals-evidence.tar" \
+            -H "Authorization: Bearer $TOKEN" \
+            --data-binary @/tmp/signals-evidence.tar
+
+      - name: Skip push (missing secret or URL)
+        if: ${{ secrets.CI_EVIDENCE_LOCKER_TOKEN == '' || env.EVIDENCE_LOCKER_URL == '' }}
+        run: |
+          echo "Locker push skipped: set CI_EVIDENCE_LOCKER_TOKEN and EVIDENCE_LOCKER_URL to enable." >&2