Gate review (Low, convergent 2c/efficiency/quality/reuse):
_SENSITIVE_HEADER_COMPACT_NAMES lost its only reader with the removed
structured walker, and _redact_log_text / redact_debug_support_error
were pure pass-throughs to redact_debug_support_text. Delete all three
and call redact_debug_support_text at every site (debug.py, dashboard
status router, /debug slash command, share_nous RPC); test docstrings
now name the real function.
e76855f3b9