feat(proto): add KpRotation + KpDeletion task variants + regen xmtp_proto

[insipx]

Stacked on #3806 (generic TaskRunner recurrence). Proto-only + minimal arms.

Adds KpRotation (tag 5) and KpDeletion (tag 6) to the xmtp.mls.database.Task oneof — two recurring singleton tasks for key-package maintenance. Empty payloads give each a stable data_hash so PullInDeadline (tag 4, from #3806) can target them.

• gen/ is regenerated AHEAD of the upstream proto pin: add TaskRunner scheduling protos: PullInDeadline, KpRotation, KpDeletion proto#339 carries all three messages; proto_version gets bumped to its merge SHA once it lands.
• Minimal dispatch arms (warn + delete) keep xmtp_mls compiling standalone; the real handlers land in the next PR of the stack.

🤖 Generated with Claude Code

Note

Add KpRotation and KpDeletion task variants to proto and worker

• Adds KpRotation (tag 5) and KpDeletion (tag 6) as new oneof variants to the Task message in xmtp.mls.database.rs, with generated serde implementations.
• In tasks.rs, the worker's run loop now matches on these new variants, logs a warning that the handler has not landed yet, and deletes the task from the database.

^{Macroscope summarized 395893d.}

[claude]

Claude finished @insipx's task —— View job

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PR Review

• Read changed files
• Analyze implementation
• Provide review feedback

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Review Summary (2026-07-02 17:48 UTC)

This PR cleanly adds two new recurring task variants for key-package maintenance. The implementation is minimal and appropriately structured as a proto-only change with placeholder handlers.

Key observations:

✅ Proto structure is sound — Empty message definitions (KpRotation {} and KpDeletion {}) correctly produce stable data_hash values via proto encoding, enabling the PullInDeadline mechanism to target these singletons

✅ Safe dispatch handling — Lines 395-404 in tasks.rs provide appropriate warn-and-delete behavior for these task variants before real handlers land

✅ Follows established patterns — Matches the approach used for PullInDeadline (tag 4) from the base PR

No critical issues found. The minimal dispatch arms appropriately prevent crashes while keeping xmtp_mls buildable. Since the PR description states "the real handlers land in the next PR of the stack," this is the expected state.

Minor observations:

• No test coverage for the new variants, but this is acceptable given they're placeholder arms that just log + delete
• The #[cfg_attr(not(test), expect(dead_code))] on TaskOutcome::RescheduleAt (line 28) will correctly self-clean when production code constructs it in the follow-up PR
• Proto regeneration produces expected boilerplate in xmtp.mls.database.serde.rs (+172 lines of serialize/deserialize implementations)

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.47%. Comparing base (01bd75a) to head (395893d).

Files with missing lines	Patch %	Lines
crates/xmtp_mls/src/worker/tasks.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                       Coverage Diff                        @@
##           insipx/taskrunner-recurrence    #3813      +/-   ##
================================================================
+ Coverage                         84.44%   84.47%   +0.03%     
================================================================
  Files                               409      409              
  Lines                             60408    60410       +2     
================================================================
+ Hits                              51009    51029      +20     
+ Misses                             9399     9381      -18     

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[insipx]

Folded into #3805 — both proto regens now ship in one PR (tags 4, 5, 6 + minimal arms).