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/fastify-template/src/app.js

@@ -0,0 +1,33 @@
+'use strict';
+
+// Simulated Fastify route registration for template injection.
+function buildServer() {
+  const routes = {};
+  return {
+    post(path, handler) {
+      routes[`POST ${path}`] = handler;
+    },
+    inject(method, path, payload) {
+      const key = `${method} ${path}`;
+      const handler = routes[key];
+      if (!handler) return { status: 404, body: 'not found' };
+      return handler({ body: payload });
+    }
+  };
+}
+
+function createServer() {
+  const server = buildServer();
+  server.post('/api/render', (req) => {
+    const template = req?.body?.template;
+    if (typeof template !== 'string') {
+      return { status: 400, body: 'bad request' };
+    }
+    const compiled = template.replace('{{user}}', 'guest');
+    // Sink: writes rendered content to log (simulated SSR)
+    return { status: 200, body: compiled };
+  });
+  return server;
+}
+
+module.exports = { createServer };