docs(10.2): plan phase — error ring buffer, sub-workflow error propagation, debug tracing

3 plans in 3 waves:
- Wave 1: Ring buffer foundation + hidden debug commands (/errors, /debug, /trace, /clear-errors)
- Wave 2: Structured error returns in all 7 sub-workflows + correlation ID tracking
- Wave 3: Debug mode tracing at sub-workflow boundaries + deployment verification

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/phases/10.2-better-logging-and-log-management/10.2-03-PLAN.md

@@ -21,12 +21,12 @@ must_haves:
       provides: "Debug trace capture at sub-workflow boundaries and callback routing"
       contains: "Log Trace"
   key_links:
-    - from: "Prepare * Input nodes"
-      to: "Log Trace"
-      via: "debug mode check before sub-workflow call"
+    - from: "Result-handling Code nodes (after Execute Workflow)"
+      to: "inline trace capture"
+      via: "debug mode check after sub-workflow returns"
       pattern: "debug.*enabled"
-    - from: "Route Callback"
-      to: "Log Trace"
+    - from: "Parse Callback Data"
+      to: "inline trace capture"
       via: "callback routing trace capture"
       pattern: "callback-routing"
 ---