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/context/ObservationCompiler.ts

@@ -25,7 +25,8 @@ import { SUMMARY_LOOKAHEAD } from './types.js';
 export function queryObservations(
   db: SessionStore,
   project: string,
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): Observation[] {
   const typeArray = Array.from(config.observationTypes);
   const typePlaceholders = typeArray.map(() => '?').join(',');
@@ -34,19 +35,38 @@ export function queryObservations(
 
   return db.db.prepare(`
     SELECT
-      id, memory_session_id, type, title, subtitle, narrative,
-      facts, concepts, files_read, files_modified, discovery_tokens,
-      created_at, created_at_epoch
-    FROM observations
-    WHERE project = ?
+      o.id,
+      o.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      o.type,
+      o.title,
+      o.subtitle,
+      o.narrative,
+      o.facts,
+      o.concepts,
+      o.files_read,
+      o.files_modified,
+      o.discovery_tokens,
+      o.created_at,
+      o.created_at_epoch
+    FROM observations o
+    LEFT JOIN sdk_sessions s ON o.memory_session_id = s.memory_session_id
+    WHERE o.project = ?
       AND type IN (${typePlaceholders})
       AND EXISTS (
-        SELECT 1 FROM json_each(concepts)
+        SELECT 1 FROM json_each(o.concepts)
         WHERE value IN (${conceptPlaceholders})
       )
-    ORDER BY created_at_epoch DESC
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY o.created_at_epoch DESC
     LIMIT ?
-  `).all(project, ...typeArray, ...conceptArray, config.totalObservationCount) as Observation[];
+  `).all(
+    project,
+    ...typeArray,
+    ...conceptArray,
+    ...(platformSource ? [platformSource] : []),
+    config.totalObservationCount
+  ) as Observation[];
 }
 
 /**
@@ -55,15 +75,30 @@ export function queryObservations(
 export function querySummaries(
   db: SessionStore,
   project: string,
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): SessionSummary[] {
   return db.db.prepare(`
-    SELECT id, memory_session_id, request, investigated, learned, completed, next_steps, created_at, created_at_epoch
-    FROM session_summaries
-    WHERE project = ?
-    ORDER BY created_at_epoch DESC
+    SELECT
+      ss.id,
+      ss.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      ss.request,
+      ss.investigated,
+      ss.learned,
+      ss.completed,
+      ss.next_steps,
+      ss.created_at,
+      ss.created_at_epoch
+    FROM session_summaries ss
+    LEFT JOIN sdk_sessions s ON ss.memory_session_id = s.memory_session_id
+    WHERE ss.project = ?
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY ss.created_at_epoch DESC
     LIMIT ?
-  `).all(project, config.sessionCount + SUMMARY_LOOKAHEAD) as SessionSummary[];
+  `).all(
+    ...[project, ...(platformSource ? [platformSource] : []), config.sessionCount + SUMMARY_LOOKAHEAD]
+  ) as SessionSummary[];
 }
 
 /**
@@ -75,7 +110,8 @@ export function querySummaries(
 export function queryObservationsMulti(
   db: SessionStore,
   projects: string[],
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): Observation[] {
   const typeArray = Array.from(config.observationTypes);
   const typePlaceholders = typeArray.map(() => '?').join(',');
@@ -87,19 +123,39 @@ export function queryObservationsMulti(
 
   return db.db.prepare(`
     SELECT
-      id, memory_session_id, type, title, subtitle, narrative,
-      facts, concepts, files_read, files_modified, discovery_tokens,
-      created_at, created_at_epoch, project
-    FROM observations
-    WHERE project IN (${projectPlaceholders})
+      o.id,
+      o.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      o.type,
+      o.title,
+      o.subtitle,
+      o.narrative,
+      o.facts,
+      o.concepts,
+      o.files_read,
+      o.files_modified,
+      o.discovery_tokens,
+      o.created_at,
+      o.created_at_epoch,
+      o.project
+    FROM observations o
+    LEFT JOIN sdk_sessions s ON o.memory_session_id = s.memory_session_id
+    WHERE o.project IN (${projectPlaceholders})
       AND type IN (${typePlaceholders})
       AND EXISTS (
-        SELECT 1 FROM json_each(concepts)
+        SELECT 1 FROM json_each(o.concepts)
         WHERE value IN (${conceptPlaceholders})
       )
-    ORDER BY created_at_epoch DESC
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY o.created_at_epoch DESC
     LIMIT ?
-  `).all(...projects, ...typeArray, ...conceptArray, config.totalObservationCount) as Observation[];
+  `).all(
+    ...projects,
+    ...typeArray,
+    ...conceptArray,
+    ...(platformSource ? [platformSource] : []),
+    config.totalObservationCount
+  ) as Observation[];
 }
 
 /**
@@ -111,18 +167,32 @@ export function queryObservationsMulti(
 export function querySummariesMulti(
   db: SessionStore,
   projects: string[],
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): SessionSummary[] {
   // Build IN clause for projects
   const projectPlaceholders = projects.map(() => '?').join(',');
 
   return db.db.prepare(`
-    SELECT id, memory_session_id, request, investigated, learned, completed, next_steps, created_at, created_at_epoch, project
-    FROM session_summaries
-    WHERE project IN (${projectPlaceholders})
-    ORDER BY created_at_epoch DESC
+    SELECT
+      ss.id,
+      ss.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      ss.request,
+      ss.investigated,
+      ss.learned,
+      ss.completed,
+      ss.next_steps,
+      ss.created_at,
+      ss.created_at_epoch,
+      ss.project
+    FROM session_summaries ss
+    LEFT JOIN sdk_sessions s ON ss.memory_session_id = s.memory_session_id
+    WHERE ss.project IN (${projectPlaceholders})
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY ss.created_at_epoch DESC
     LIMIT ?
-  `).all(...projects, config.sessionCount + SUMMARY_LOOKAHEAD) as SessionSummary[];
+  `).all(...projects, ...(platformSource ? [platformSource] : []), config.sessionCount + SUMMARY_LOOKAHEAD) as SessionSummary[];
 }
 
 /**