feat: Implement Filesystem and MongoDB provenance writers for PackRun execution context

- Added `FilesystemPackRunProvenanceWriter` to write provenance manifests to the filesystem.
- Introduced `MongoPackRunArtifactReader` to read artifacts from MongoDB.
- Created `MongoPackRunProvenanceWriter` to store provenance manifests in MongoDB.
- Developed unit tests for filesystem and MongoDB provenance writers.
- Established `ITimelineEventStore` and `ITimelineIngestionService` interfaces for timeline event handling.
- Implemented `TimelineIngestionService` to validate and persist timeline events with hashing.
- Created PostgreSQL schema and migration scripts for timeline indexing.
- Added dependency injection support for timeline indexer services.
- Developed tests for timeline ingestion and schema validation.

bench/reachability-benchmark/cases/js/express-eval/tests/run-tests.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "$0")"
+export SOURCE_DATE_EPOCH=${SOURCE_DATE_EPOCH:-1730000000}
+export TZ=UTC
+export LC_ALL=C
+node test_reach.js

bench/reachability-benchmark/cases/js/express-eval/tests/test_reach.js

@@ -0,0 +1,54 @@
+'use strict';
+
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const { createServer } = require('../src/app');
+
+const OUT_DIR = path.resolve(__dirname, '../outputs');
+const TRACE_DIR = path.join(OUT_DIR, 'traces');
+const COVERAGE_FILE = path.join(OUT_DIR, 'coverage.json');
+const TRACE_FILE = path.join(TRACE_DIR, 'traces.json');
+
+function ensureDirs() {
+  fs.mkdirSync(OUT_DIR, { recursive: true });
+  fs.mkdirSync(TRACE_DIR, { recursive: true });
+}
+
+function recordTrace(entry, pathNodes) {
+  fs.writeFileSync(
+    TRACE_FILE,
+    JSON.stringify({
+      entry,
+      path: pathNodes,
+      sink: 'ExpressEval::exec',
+      notes: 'Admin exec reached'
+    }, null, 2)
+  );
+}
+
+function recordCoverage(filePath, lines) {
+  fs.writeFileSync(
+    COVERAGE_FILE,
+    JSON.stringify({
+      files: {
+        [filePath]: {
+          lines_covered: lines,
+          lines_total: 40
+        }
+      }
+    }, null, 2)
+  );
+}
+
+(function main() {
+  ensureDirs();
+  const app = createServer();
+  const res = app.handle('POST', '/api/admin/exec', { body: { code: '21*2' } });
+  assert.strictEqual(res.status, 200);
+  assert.strictEqual(res.body, '42');
+
+  recordTrace('POST /api/admin/exec', ['app.js::createServer', 'handler', 'eval(code)']);
+  recordCoverage('src/app.js', [5, 6, 7, 13, 18, 19]);
+  fs.writeFileSync(path.join(OUT_DIR, 'SINK_REACHED'), 'true');
+})();