* fix(codex): strip regex lookaround from tool schema patterns (port from 9router#1556)
Codex/OpenAI's Responses API rejects JSON Schema pattern fields using regex lookaround (e.g. ^(?=.*@).+$) with a 400 'regex lookaround is not supported' error. The existing numeric-field sanitizer (coerceSchemaNumericFields) was only wired into the translated-request path (openai-to-claude.ts), not the native codex/openai passthrough path (normalizeCodexTools in open-sse/executors/codex/tools.ts), so lookahead/lookbehind patterns reached upstream unmodified and broke tool calls for clients that emit them (e.g. IDE agent harnesses validating an email field).
Reported-by: evin (@evinjohnn) (https://github.com/decolua/9router/issues/1556)
* chore(changelog): move #1556 entry to changelog.d fragment
Consistency with the repo's canonical changelog.d/fixes/ workflow (avoids
merge-storm re-conflicts from editing CHANGELOG.md directly).
* refactor(codex): table-drive the regex-strip recursion to keep the complexity ratchet at baseline
The #1556 lookaround strip walked every sub-schema field with its own
copy-pasted if-block (properties / patternProperties / definitions / $defs,
then prefixItems / anyOf / oneOf / allOf), pushing stripUnsupportedRegexPatterns
past the cyclomatic threshold and check:complexity to 2057 > baseline 2056.
Collapse the eight near-identical blocks into two loops over the field-name
constants, with the object-map recursion factored into a helper. Same fields,
same traversal order, same behavior — complexity is back at baseline 2056 and
the #1556 regression tests still pass.
fdabec6e59