The outer conversation-loop except handler only left the loop on a
local-processing error or when api_call_count >= max_iterations - 1.
With the turn budget now unlimited by default (sys.maxsize), a
permanent failure that escaped the inner retry/fallback machinery
retried forever: ~64 retries/s, one core pegged, and the rotated
agent.log history overwritten within minutes.
Bound the loop with a small per-turn cap on total escaping exceptions
(_MAX_OUTER_LOOP_ERRORS = 8, scaled down by a tiny explicit
max_iterations so a manually bounded budget still governs). The legacy
local-processing and near-limit exits are byte-identical; a new
'repeated_outer_errors' exit reason gets a user-facing explanation.
The inner retry/fallback layer owns transient API recovery and
terminates on its own, so only exceptions that escape it reach this
cap - a successful turn is unaffected.
Fixes#92450
56e7fd2adf