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/transcripts/processor.ts

@@ -9,9 +9,11 @@ import { writeAgentsMd } from '../../utils/agents-md-utils.js';
 import { resolveFieldSpec, resolveFields, matchesRule } from './field-utils.js';
 import { expandHomePath } from './config.js';
 import type { TranscriptSchema, WatchTarget, SchemaEvent } from './types.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';
 
 interface SessionState {
   sessionId: string;
+  platformSource: string;
   cwd?: string;
   project?: string;
   lastUserMessage?: string;
@@ -51,6 +53,7 @@ export class TranscriptEventProcessor {
     if (!session) {
       session = {
         sessionId,
+        platformSource: normalizePlatformSource(watch.name),
         pendingTools: new Map()
       };
       this.sessions.set(key, session);
@@ -181,7 +184,7 @@ export class TranscriptEventProcessor {
       sessionId: session.sessionId,
       cwd,
       prompt,
-      platform: 'transcript'
+      platform: session.platformSource
     });
   }
 
@@ -250,7 +253,7 @@ export class TranscriptEventProcessor {
       toolName,
       toolInput: this.maybeParseJson(fields.toolInput),
       toolResponse: this.maybeParseJson(fields.toolResponse),
-      platform: 'transcript'
+      platform: session.platformSource
     });
   }
 
@@ -263,7 +266,7 @@ export class TranscriptEventProcessor {
       cwd: session.cwd ?? process.cwd(),
       filePath,
       edits: Array.isArray(fields.edits) ? fields.edits : undefined,
-      platform: 'transcript'
+      platform: session.platformSource
     });
   }
 
@@ -305,7 +308,7 @@ export class TranscriptEventProcessor {
     await sessionCompleteHandler.execute({
       sessionId: session.sessionId,
       cwd: session.cwd ?? process.cwd(),
-      platform: 'transcript'
+      platform: session.platformSource
     });
     await this.updateContext(session, watch);
     session.pendingTools.clear();
@@ -325,7 +328,8 @@ export class TranscriptEventProcessor {
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
           contentSessionId: session.sessionId,
-          last_assistant_message: lastAssistantMessage
+          last_assistant_message: lastAssistantMessage,
+          platformSource: session.platformSource
         })
       });
     } catch (error) {
@@ -350,7 +354,7 @@ export class TranscriptEventProcessor {
 
     try {
       const response = await workerHttpRequest(
-        `/api/context/inject?projects=${encodeURIComponent(projectsParam)}`
+        `/api/context/inject?projects=${encodeURIComponent(projectsParam)}&platformSource=${encodeURIComponent(session.platformSource)}`
       );
       if (!response.ok) return;