The blanket ban could not be satisfied: a lambda's type is unnameable, and
std::function is the wrong substitute in per-tick hot paths, so around seven
named local lambdas in lib violated the rule with no way to comply. Spelled-out
iterator types were being followed inconsistently in the same file.
Carving out the two cases makes the guideline enforceable rather than silently
broken. No code is changed here; existing spelled-out iterator types stay valid.
Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YHcUerKAZKWNvSKJxYKbnG
