From 11d331238d3d06e797d5a80f5c8f5d9d6492bdca Mon Sep 17 00:00:00 2001
From: Ed_ <edwardgz@gmail.com>
Date: Sat, 20 Jun 2026 00:31:32 -0400
Subject: [PATCH] chore: TIER-2 READ
 conductor/code_styleguides/error_handling.md lines 462-540 (logging NOT a
 drain) before Phase 10

CRITICAL ANTI-SLIMING PHASE.

Per the user's principle (2026-06-17) and error_handling.md:530:
'IF ANY PLACE HAS A ERROR LOG IT ALSO NEEDS A RESULT[T]. RESULT[T]
PROPOGATES UNTIL IT REACHED A DRAIN POINT WHERE THE ERROR CAN BE
HANDLED APPROPRIATELY WITHOUT CRASHING THE APP.'

The 13 INTERNAL_SILENT_SWALLOW sites have logging-only except bodies
(sys.stderr.write, print, traceback.print_exc). Per the styleguide,
logging is NOT a drain. These sites MUST be migrated to full
Result[T] propagation. No narrowing + logging; no pass after
logging; no intentional silent recovery.

Migration pattern for Phase 10:
1. Extract a _<site>_result helper that returns Result[bool]
2. The helper's except body converts the exception to ErrorInfo
3. The legacy wrapper drains to the appropriate data plane attr:
   - _startup_timeline_errors for startup-time (L216, L241, L567, L684, L971)
   - _last_request_errors for render-loop/event handler (L1071, L1501, L1527, L6691, L7026, L7042)
   - _worker_errors for background thread callbacks (L4739, L1345)

The 13 sites (per PHASE1_SITE_INVENTORY.md):
- L216 _detect_refresh_rate_win32
- L241 _resolve_font_path
- L567 _post_init
- L684 run
- L971 shutdown
- L1071 _gui_func
- L1345 _close_vscode_diff
- L1501 render_main_interface (auto-save)
- L1527 render_main_interface (auto-save)
- L4739 _on_warmup_complete_callback
- L6691 render_tier_stream_panel
- L7026 render_task_dag_panel
- L7042 render_task_dag_panel

One atomic commit per site. NO sliming heuristics. NO pass-after-logging.
NO 'intentional silent recovery'. Each site becomes a Result[T].