compat date for nonretryable release

[tewaro]

Includes a disable flag

Supersedes #6592

[ask-bonk]

UnknownError: ProviderInitError

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[vaishnav-mk]

lgtm,
cc: @deloreyj

[ask-bonk]

The change looks correct:

1. Ordinal (@170) is unchanged -- this is just modifying annotations on an existing field, not adding a new one.
2. Enable flag (workflows_preserve_non_retryable_error_message) was already present and is unchanged.
3. Disable flag (workflows_replace_non_retryable_error_message) is added -- naming follows convention (describes the old behavior).
4. Enable date (2026-05-14) is ~3 weeks in the future from today (2026-04-21), which is reasonable.
5. The $experimental annotation is correctly removed since this is being promoted to a standard flag.
6. The field comment adequately describes the behavior.
7. No wire-compatibility concerns -- only annotations changed, no field reordering/renaming/removal.

There are no logic bugs, security issues, backward compat violations, or missing compat flags. The disable flag is included. The naming is consistent. The enable date is in the future.

LGTM

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[kentonv]

We have a new policy that any PR to set a default-on date on a compat flag MUST be accompanied by a docs PR and that PR must be approved and ready to merge before landing the workerd PR.

Does this change have a docs PR?

[vaishnav-mk]

We have a new policy that any PR to set a default-on date on a compat flag MUST be accompanied by a docs PR and that PR must be approved and ready to merge before landing the workerd PR.

Does this change have a docs PR?

hey @kentonv, there's a docs PR associated with this as well
cloudflare/cloudflare-docs#30139