From 16079d930d44ccfcead80342de82c83b7a43552f Mon Sep 17 00:00:00 2001
From: Ed_ <edwardgz@gmail.com>
Date: Sat, 20 Jun 2026 00:22:33 -0400
Subject: [PATCH] TIER-2 READ conductor/code_styleguides/error_handling.md
 end-to-end before Phase 8: re-read Drain Plane section (lines 396-470, all 5
 drain patterns), Result-recovery pattern, and the per-drain-plane routing.
 Phase 8 covers property setter / state sites. For startup callbacks (L591
 _diag_layout_state), the canonical drain is app._startup_timeline_errors (the
 phase 2 drain plane). For property setters (L897 _capture_workspace_profile),
 the canonical drain is app._last_request_errors (per FR-BC-4 event-handler
 drain pattern).