feat: isolate Claude and Codex session sources

Persist platform_source across session creation, transcript ingestion, API query paths, and viewer state so Claude and Codex data can coexist without bleeding into each other.

- add platform-source normalization helpers and persist platform_source in sdk_sessions via migration 24 with backfill and indexing
- thread platformSource through CLI hooks, transcript processing, context generation, pagination, search routes, SSE payloads, and session management
- expose source-aware project catalogs, viewer tabs, context preview selectors, and source badges for observations, prompts, and summaries
- start the transcript watcher from the worker for transcript-based clients and preserve platform source during Codex ingestion
- auto-start the worker from the MCP server for MCP-only clients and tighten stdio-driven cleanup during shutdown
- keep createSDKSession backward compatible with existing custom-title callers while allowing explicit platform source forwarding

src/services/worker/http/routes/DataRoutes.ts

@@ -66,8 +66,8 @@ export class DataRoutes extends BaseRouteHandler {
    * Get paginated observations
    */
   private handleGetObservations = this.wrapHandler((req: Request, res: Response): void => {
-    const { offset, limit, project } = this.parsePaginationParams(req);
-    const result = this.paginationHelper.getObservations(offset, limit, project);
+    const { offset, limit, project, platformSource } = this.parsePaginationParams(req);
+    const result = this.paginationHelper.getObservations(offset, limit, project, platformSource);
     res.json(result);
   });
 
@@ -75,8 +75,8 @@ export class DataRoutes extends BaseRouteHandler {
    * Get paginated summaries
    */
   private handleGetSummaries = this.wrapHandler((req: Request, res: Response): void => {
-    const { offset, limit, project } = this.parsePaginationParams(req);
-    const result = this.paginationHelper.getSummaries(offset, limit, project);
+    const { offset, limit, project, platformSource } = this.parsePaginationParams(req);
+    const result = this.paginationHelper.getSummaries(offset, limit, project, platformSource);
     res.json(result);
   });
 
@@ -84,8 +84,8 @@ export class DataRoutes extends BaseRouteHandler {
    * Get paginated user prompts
    */
   private handleGetPrompts = this.wrapHandler((req: Request, res: Response): void => {
-    const { offset, limit, project } = this.parsePaginationParams(req);
-    const result = this.paginationHelper.getPrompts(offset, limit, project);
+    const { offset, limit, project, platformSource } = this.parsePaginationParams(req);
+    const result = this.paginationHelper.getPrompts(offset, limit, project, platformSource);
     res.json(result);
   });
 
@@ -256,19 +256,19 @@ export class DataRoutes extends BaseRouteHandler {
    * GET /api/projects
    */
   private handleGetProjects = this.wrapHandler((req: Request, res: Response): void => {
-    const db = this.dbManager.getSessionStore().db;
+    const store = this.dbManager.getSessionStore();
+    const platformSource = req.query.platformSource as string | undefined;
 
-    const rows = db.prepare(`
-      SELECT DISTINCT project
-      FROM observations
-      WHERE project IS NOT NULL
-      GROUP BY project
-      ORDER BY MAX(created_at_epoch) DESC
-    `).all() as Array<{ project: string }>;
+    if (platformSource) {
+      res.json({
+        projects: store.getAllProjects(platformSource),
+        sources: [platformSource],
+        projectsBySource: { [platformSource]: store.getAllProjects(platformSource) }
+      });
+      return;
+    }
 
-    const projects = rows.map(row => row.project);
-
-    res.json({ projects });
+    res.json(store.getProjectCatalog());
   });
 
   /**
@@ -299,12 +299,13 @@ export class DataRoutes extends BaseRouteHandler {
   /**
    * Parse pagination parameters from request query
    */
-  private parsePaginationParams(req: Request): { offset: number; limit: number; project?: string } {
+  private parsePaginationParams(req: Request): { offset: number; limit: number; project?: string; platformSource?: string } {
     const offset = parseInt(req.query.offset as string, 10) || 0;
     const limit = Math.min(parseInt(req.query.limit as string, 10) || 20, 100); // Max 100
     const project = req.query.project as string | undefined;
+    const platformSource = req.query.platformSource as string | undefined;
 
-    return { offset, limit, project };
+    return { offset, limit, project, platformSource };
   }
 
   /**