{
  "track_id": "startup_speedup_20260606",
  "name": "Sloppy.py Startup Speedup",
  "initialized": "2026-06-06",
  "owner": "tier2-tech-lead",
  "priority": "high",
  "status": "active",
  "type": "refactor + performance",
  "scope": {
    "new_files": [
      "src/startup_profiler.py",
      "scripts/audit_main_thread_imports.py",
      "scripts/audit_gui2_imports.py",
      "tests/test_ai_client_no_top_level_sdk_imports.py",
      "tests/test_hook_server_no_top_level_fastapi.py",
      "tests/test_app_controller_io_pool.py",
      "tests/test_warmup_mechanism.py",
      "tests/test_command_palette_no_top_level_import.py",
      "tests/test_theme_nerv_no_top_level_import.py",
      "tests/test_markdown_helper_no_top_level_import.py",
      "tests/test_api_hooks_warmup.py",
      "tests/test_main_thread_purity.py",
      "tests/test_startup_profiler.py",
      "tests/test_io_pool_endpoint.py"
    ],
    "modified_files": [
      "src/ai_client.py",
      "src/api_hooks.py",
      "src/app_controller.py",
      "src/commands.py",
      "src/command_palette.py",
      "src/theme_2.py",
      "src/theme_nerv.py",
      "src/theme_nerv_fx.py",
      "src/markdown_helper.py",
      "src/markdown_table.py",
      "src/gui_2.py",
      "src/log_pruner.py",
      "src/project_manager.py"
    ]
  },
  "blocked_by": [],
  "blocks": [],
  "estimated_phases": 9,
  "spec": "spec.md",
  "plan": "plan.md",
  "architectural_invariant": "The main thread (the one that enters immapp.run()) must NEVER import a module heavier than imgui_bundle and the lean gui_2 skeleton. Heavy modules are removed from main-thread-reachable files entirely and accessed via _require_warmed(name) at use sites, which assumes the module is in sys.modules because AppController's warmup pre-loaded it on the _io_pool. Enforced by scripts/audit_main_thread_imports.py (static CI gate) and tests/test_main_thread_purity.py (runtime audit-hook test).",
  "threading_constraint": "NO new threading.Thread(...) calls in src/. All background work must go through AppController._io_pool (ThreadPoolExecutor, max_workers=4, thread_name_prefix='controller-io'). The _io_pool is also the home of the heavy-module warmup jobs submitted in AppController.__init__.",
  "warmup_mechanism": "AppController.__init__ submits one job per heavy module to _io_pool. Each job imports its module and updates a thread-safe warmup_status dict. When the last job completes, _warmup_done_event is set and registered on_warmup_complete callbacks fire. The GUI polls warmup_status() each frame for a status-bar indicator. /api/warmup_status and /api/warmup_wait expose the state to tests and external clients. The user is notified via a toast on completion: 'All providers ready (M modules).'",
  "verification_criteria": [
    "import src.ai_client < 50ms cold start (from ~1800ms)",
    "import src.gui_2 < 500ms cold start (from ~3000ms)",
    "import src.app_controller < 300ms cold start (from ~700ms)",
    "uv run sloppy.py --enable-test-hooks reaches immapp.run() in < 1.5s",
    "live_gui.wait_for_server(timeout=15) passes for all tests",
    "scripts/audit_main_thread_imports.py exits 0 (no heavy imports on main)",
    "tests/test_main_thread_purity.py passes (runtime audit hook confirms invariant)",
    "controller.wait_for_warmup(timeout=10) returns True",
    "All warmup modules in sys.modules after warmup completes",
    "User-triggered provider switch is INSTANT (proves warmup worked)",
    "GUI shows 'Warming up... (N/M)' then 'All imports ready' with green dot, then a toast",
    "GET /api/warmup_status returns {pending: [], completed: [...], failed: []}",
    "NO `import X` statements inside function bodies for heavy modules (grep-verified)",
    "No regressions in 273+ existing tests",
    "ZERO new threading.Thread(...) calls in src/ (after Phase 6 migration)",
    "Startup profile + io_pool status visible via /api/startup_profile, /api/io_pool_status"
  ],
  "links": {
    "backlog_entry": "conductor/tracks.md:152",
    "benchmark_script": "scripts/benchmark_imports.py",
    "audit_script": "scripts/audit_main_thread_imports.py",
    "related_docs": [
      "docs/guide_architecture.md",
      "docs/guide_app_controller.md",
      "docs/guide_hot_reload.md",
      "docs/guide_testing.md"
    ]
  }
}