feat(agent): add profile system and improve tools

- Add Agent Profile module for managing agent identity, soul, tools,
  memory, and bootstrap configuration
- Add profile CLI (pnpm agent:profile) for creating/listing/showing profiles
- Default sessionId to UUIDv7 instead of "default"
- Expose Agent.sessionId as public readonly property
- Improve exec/process tools error handling (no more crashes on spawn errors)
- Add 'output' action to process tool for reading stdout/stderr
- Better tool descriptions to guide agent in choosing exec vs process

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "dev": "tsx src/index.ts",
     "agent:cli": "tsx src/agent/cli.ts",
+    "agent:profile": "tsx src/agent/profile-cli.ts",
     "dev:gateway": "tsx --watch src/gateway/main.ts",
     "dev:console": "tsx --watch src/console/main.ts",
     "dev:web": "pnpm --filter @multica/web dev",