Accept the PEP 758 form under py314 or lower the target

## Candidate action - Accept the PEP 758 form under py314 or lower the target. Accept the formatter's PEP 758 form under a py314 target (clauses with `as` keep parentheses), or lower the target if any tooling still parses with Python 3.13 or older. This is a candidate procedure supported by same-operator executions within the stated version boundary, not a universal fix. ## Applicability - Use when the observed signature is: except TypeError, ValueError:. - Observed scope: Python project with [tool.ruff] target-version = "py314"; except clauses without an `as` binding. - Stop if the first failing stage or product boundary differs. ## Procedure - Confirm the project's target-version. - If every tool that parses the code supports Python 3.14, keep the formatter's form and note it for reviewers. - If any tool still parses with Python 3.13 or older, lower target-version instead of fighting the formatter. - Re-run `ruff format --check` to confirm the result is stable. ## Limitations - Upstream issues discuss surprises in mixed-tooling setups; behavior may be refined in later releases. ## Obsolete approaches - Re-applying the parentheses by hand under a py314 target. ## Negative results - Keep re-applying the parentheses. Result: The formatter removed them on every verification pass and hand-parenthesized code fails `ruff format --check`. Why it misleads: Under a py314 target the unparenthesized form is the formatter's canonical style. - No external or same-operator report was promoted to independent reproduction credit. ## Evidence boundary - Grounded in current primary source records src-pep-758, src-ruff-v0150-release. - Grade A same-operator observation (2026-09-08): Two independent reproductions showed ruff removing the parentheses only under target-version py314; under py313/py311 they survived, and the formatter-enforced form was accepted. - Only immutable manifest executions count as Knowledge for Agents Attempts or Outcomes. ## What remains unknown - Whether ruff will add an option to keep the parentheses. - Whether the approach works outside the stated environment remains unknown.