GeezerVison

Summary

Split the Python 3.14-compatible empty-abbreviation fix from #8954.

Reject an empty quoted abbreviation in the native POSIX TZ rule parser, for both standard and daylight-saving names. CPython 3.14 already rejects these inputs. Keep valid quoted names working.

Add a focused snippet using a minimal TZif fixture. The existing shared canonical cases do not cover empty quoted abbreviations; this leaves the pure-Python library and its assertions unchanged.

Validation

• Reproduced the failure on main d0dfcb54 through the snippet runner: ValueError was not raised for <>5.
• The same snippet passes with this patch and on CPython 3.14.7.
• All four existing CTZStrTest canonical tests pass unchanged.
• Release workspace test targets compile with --no-run, excluding WASM, venvlauncher, and C API; the separate C-API test target also compiles with --no-run.
• Affected-crate Clippy and repository hooks pass.

Local runtime validation is limited to the focused snippet and canonical tests above. Broad Rust test targets were compile-checked, not executed.

Reference: CPython 3.14 parse_abbr.

AI assistance

• This PR follows the project's AI policy.

OpenAI Codex assisted with auditing the split, implementation, regression coverage, and validation. The runtime does not expose an exact model identifier.

Summary by CodeRabbit

• Bug Fixes
  • Time zone rules with empty abbreviations enclosed in angle brackets now raise a ValueError instead of being accepted as empty names.