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.

tools/signals-upload-evidence.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+STAGED_DIR="evidence-locker/signals/2025-12-05"
+MODULE_ROOT="docs/modules/signals"
+TAR_OUT="/tmp/signals-evidence.tar"
+
+if [[ -z "${EVIDENCE_LOCKER_URL:-}" || -z "${CI_EVIDENCE_LOCKER_TOKEN:-}" ]]; then
+  echo "EVIDENCE_LOCKER_URL and CI_EVIDENCE_LOCKER_TOKEN are required" >&2
+  exit 1
+fi
+
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir"' EXIT
+
+rsync -a --relative \
+  "$STAGED_DIR/SHA256SUMS" \
+  "$STAGED_DIR/confidence_decay_config.sigstore.json" \
+  "$STAGED_DIR/unknowns_scoring_manifest.sigstore.json" \
+  "$STAGED_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/"
+
+pushd "$tmpdir/$STAGED_DIR" >/dev/null
+sha256sum --check SHA256SUMS
+popd >/dev/null
+
+# Build deterministic tarball
+pushd "$tmpdir" >/dev/null
+tar --sort=name --mtime="UTC 1970-01-01" --owner=0 --group=0 --numeric-owner \
+  -cf "$TAR_OUT" .
+popd >/dev/null
+
+sha256sum "$TAR_OUT"
+
+curl --retry 3 --retry-delay 2 --fail \
+  -H "Authorization: Bearer $CI_EVIDENCE_LOCKER_TOKEN" \
+  -X PUT "$EVIDENCE_LOCKER_URL/signals/2025-12-05/signals-evidence.tar" \
+  --data-binary "@$TAR_OUT"
+
+echo "Uploaded $TAR_OUT to $EVIDENCE_LOCKER_URL/signals/2025-12-05/"