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/sidecar/claude/claude-manager.ts

@@ -4,6 +4,8 @@ import type { PiEvent, MessageCost } from '../../api/pi/types';
 import type { ClaudeSpawnParams, ClaudeSpawnStreamingParams, ClaudeCodeResult } from '../protocol';
 import { getState, setClaudeSession, clearClaudeSession, getClaudeSession } from './state';
 import { getProxySecret } from './proxy';
+import { discoverTools } from '../../tool-registry';
+import type { ToolDefinition } from '../../tool-registry';
 
 const SEND_TIMEOUT_MS = 5 * 60 * 1000;
 const PROXY_PORT = process.env.ANTHROPIC_PROXY_PORT ?? '5051';
@@ -11,6 +13,27 @@ const DATA_PATH = process.env.DATA_PATH ?? join(process.cwd(), 'data');
 
 const getHomeDir = (email: string) => join(DATA_PATH, email, 'home');
 
+function buildToolContext(email: string): string {
+  const tools = discoverTools(email);
+  if (tools.length === 0) return '';
+
+  const sections = tools.map((tool) => {
+    const lines = [`## ${tool.name}`, tool.description];
+    const inputEntries = Object.entries(tool.inputs);
+    if (inputEntries.length > 0) {
+      const inputParts = inputEntries.map(([name, input]) => {
+        const opt = input.optional ? ', optional' : '';
+        const vals = input.values ? `, values: ${input.values}` : '';
+        return `${name} (${input.type}${vals}${opt}): ${input.description}`;
+      });
+      lines.push(`Inputs: ${inputParts.join('; ')}`);
+    }
+    return lines.join('\n');
+  });
+
+  return `The following tools are available on this platform:\n\n${sections.join('\n\n---\n\n')}\n\n---\n\n`;
+}
+
 const toShellUsername = (username: string, email: string): string => {
   const raw = username || email.split('@')[0]!;
   return (
@@ -66,12 +89,15 @@ export async function spawnClaude(params: ClaudeSpawnParams): Promise<ClaudeCode
   const homeDir = getHomeDir(email);
   const shellUsername = toShellUsername(username, email);
 
-  const claudeArgs = [CLAUDE_BIN, '-p', prompt, '--dangerously-skip-permissions', '--output-format', 'json'];
+  const existingSession = getClaudeSession(sessionKey);
+  const isResume = !!existingSession;
+
+  const effectivePrompt = isResume ? prompt : buildToolContext(email) + prompt;
+  const claudeArgs = [CLAUDE_BIN, '-p', effectivePrompt, '--dangerously-skip-permissions', '--output-format', 'json'];
 
   const subModel = params.model?.split('/')[1];
   if (subModel) claudeArgs.push('--model', subModel);
 
-  const existingSession = getClaudeSession(sessionKey);
   if (existingSession) {
     claudeArgs.push('--resume', existingSession);
   }
@@ -157,10 +183,14 @@ export async function spawnClaudeStreaming(
   const homeDir = getHomeDir(email);
   const workDir = cwd ?? homeDir;
 
+  const existingSession = getClaudeSession(sessionKey);
+  const isResume = !!existingSession;
+
+  const effectivePrompt = isResume ? prompt : buildToolContext(email) + prompt;
   const claudeArgs = [
     CLAUDE_BIN,
     '-p',
-    prompt,
+    effectivePrompt,
     '--dangerously-skip-permissions',
     '--output-format',
     'stream-json',
@@ -171,7 +201,6 @@ export async function spawnClaudeStreaming(
   const subModel = params.model?.split('/')[1];
   if (subModel) claudeArgs.push('--model', subModel);
 
-  const existingSession = getClaudeSession(sessionKey);
   if (existingSession) {
     claudeArgs.push('--resume', existingSession);
   }