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/case.yaml

@@ -0,0 +1,38 @@
+id: "js-fastify-template:005"
+language: js
+project: fastify-template
+version: "1.0.0"
+description: "Template rendering route replaces user placeholder"
+entrypoints:
+  - "POST /api/render"
+sinks:
+  - id: "FastifyTemplate::render"
+    path: "src/app.js::createServer"
+    kind: "http"
+    location:
+      file: src/app.js
+      line: 19
+    notes: "Template rendering of user input"
+environment:
+  os_image: "node:20-alpine"
+  runtime:
+    node: "20.11.0"
+  source_date_epoch: 1730000000
+build:
+  command: "./build/build.sh"
+  source_date_epoch: 1730000000
+  outputs:
+    artifact_path: outputs/binary.tar.gz
+    sbom_path: outputs/sbom.cdx.json
+    coverage_path: outputs/coverage.json
+    traces_dir: outputs/traces
+test:
+  command: "./tests/run-tests.sh"
+  expected_coverage:
+    - outputs/coverage.json
+  expected_traces:
+    - outputs/traces/traces.json
+ground_truth:
+  summary: "Template rendering reachable via POST /api/render"
+  evidence_files:
+    - "../benchmark/truth/js-fastify-template.json"

bench/reachability-benchmark/cases/js/fastify-template/entrypoints.yaml

@@ -0,0 +1,8 @@
+case_id: "js-fastify-template:005"
+entries:
+  http:
+    - id: "POST /api/render"
+      route: "/api/render"
+      method: "POST"
+      handler: "createServer.render"
+      description: "Template rendering endpoint"

bench/reachability-benchmark/cases/js/fastify-template/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "rb-case-fastify-template",
+  "version": "1.0.0",
+  "description": "Reachability benchmark case: fastify-like template rendering",
+  "license": "Apache-2.0",
+  "scripts": {
+    "test": "./tests/run-tests.sh"
+  }
+}

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 };

bench/reachability-benchmark/cases/js/fastify-template/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/fastify-template/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: 'FastifyTemplate::render',
+      notes: 'Template rendered with user input'
+    }, null, 2)
+  );
+}
+
+function recordCoverage(filePath, lines) {
+  fs.writeFileSync(
+    COVERAGE_FILE,
+    JSON.stringify({
+      files: {
+        [filePath]: {
+          lines_covered: lines,
+          lines_total: 45
+        }
+      }
+    }, null, 2)
+  );
+}
+
+(function main() {
+  ensureDirs();
+  const server = createServer();
+  const res = server.inject('POST', '/api/render', { template: 'Hello {{user}}' });
+  assert.strictEqual(res.status, 200);
+  assert.strictEqual(res.body, 'Hello guest');
+
+  recordTrace('POST /api/render', ['app.js::createServer', 'render template']);
+  recordCoverage('src/app.js', [5,6,7,13,18,20]);
+  fs.writeFileSync(path.join(OUT_DIR, 'SINK_REACHED'), 'true');
+})();