tool registry, claude tool awareness, and model selector fix

- Add agent-agnostic tool registry (tool-registry.ts) that discovers tools from disk
- Embed tool-loader extension as platform infrastructure (ensure-tool-loader.ts)
- Inject tool context into Claude prompts on first message
- Add marketplace tool sync (sync-marketplace.ts)
- Fix model selector defaulting to claude-code when no model explicitly selected
- Exclude tool-loader-source.ts from tsconfig (Pi-specific deps)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/servers/bootstrap.ts

@@ -2,9 +2,8 @@ import { mkdirSync } from 'node:fs';
 import { join } from 'node:path';
 import { homedir } from 'node:os';
 import { DATA_PATH } from './data-path';
-import { syncSeedSkills } from './sync-skills';
-import { syncSeedTools } from './sync-tools';
-import { syncSeedExtensions } from './sync-extensions';
+import { syncMarketplaceTools } from './sync-marketplace';
+import { ensureToolLoader } from './ensure-tool-loader';
 // Queue is now owned by the sidecar process
 import { startDiscordBotIfConfigured } from './channels/discord/bot';
 import { startTelegramBotIfConfigured } from './channels/telegram/bot';
@@ -68,9 +67,8 @@ async function installPi(): Promise<boolean> {
     }
   }
 
-  syncSeedSkills();
-  syncSeedTools();
-  syncSeedExtensions();
+  await syncMarketplaceTools();
+  ensureToolLoader();
   // Queue is initialized by the sidecar process
 
   await startDiscordBotIfConfigured().catch((err) => {