Add compat-enable-date for process-pth-files

[hoodmane]

No description provided.

[ask-bonk]

The date 2026-05-26 is about 3 weeks in the future from today (May 5, 2026), which is consistent with the pattern of other recent enable dates. The change is minimal and correct:

1. The flag already had $compatEnableFlag and $compatDisableFlag annotations.
2. The only change is adding a $compatEnableDate("2026-05-26") to make the flag default-on for workers with compat date >= 2026-05-26.
3. The semicolon was correctly moved from the $compatDisableFlag line to the new $compatEnableDate line.
4. The ordinal @176 and field name are unchanged.
5. The comment block explaining the flag behavior is already present.

This is a clean, one-line-addition change that follows the established patterns in the file. No logic bugs, no backward compatibility issues (the disable flag already exists for opt-out), no security concerns.

LGTM

github run

[codspeed-hq]

Merging this PR will improve performance by 14.3%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 71 untouched benchmarks
⏩ 129 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	Encode_ASCII_32[TextEncoder][0/0/32]	3.1 ms	2.7 ms	+14.3%

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_{Comparing hoodmane/pth-enable-date (88234c0) with main (d3ed2b2)}

Footnotes

1. 129 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩