fix(redfish): gate hgx diagnostic plan-b by debug toggle

bible-local/05-collectors.md

@@ -27,6 +27,7 @@ Request fields passed from the server:
 - credential field (`password` or token)
 - `tls_mode`
 - optional `power_on_if_host_off`
+- optional `debug_payloads` for extended diagnostics
 
 ### Core rule
 
@@ -57,6 +58,17 @@ closes `skipCh` → goroutine in `Collect()` → `cancelCollect()`.
 
 The skip button is visible during `running` state and hidden once the job reaches a terminal state.
 
+### Extended diagnostics toggle
+
+The live collect form exposes a user-facing checkbox for extended diagnostics.
+
+- default collection prioritizes inventory completeness and bounded runtime
+- when extended diagnostics is off, heavy HGX component-chassis critical plan-B retries
+  (`Assembly`, `Accelerators`, `Drives`, `NetworkAdapters`, `PCIeDevices`) are skipped
+- when extended diagnostics is on, those retries are allowed and extra debug payloads are collected
+
+This toggle is intended for operator-driven deep diagnostics on problematic hosts, not for the default path.
+
 ### Discovery model
 
 The collector does not rely on one fixed vendor tree.