fix: prevent refresh_state cursor increment when commit log is disabled

[xmtp-coder-agent]

Resolves #2983

Summary

• Changes publish_commit_log return type from Result<()> to Result<bool> across the XmtpMlsClient trait and all implementations
• D14N implementation now returns Ok(false) (no-op), V3 returns Ok(true) (actually published)
• CommitLogWorker::publish_commit_logs_to_remote only updates the refresh_state cursor when the publish actually occurred (Ok(true))

Problem

When using the D14N client, publish_commit_log returns Ok(()) without actually publishing anything (commit log is not yet implemented for D14N). The caller treats this as success and increments the EntityKind::CommitLogUpload cursor in refresh_state, even though no data was uploaded.

Test plan

• cargo check passes for all affected crates
• cargo clippy passes with no warnings
• Existing commit log tests continue to pass (V3 path unchanged)
• D14N path no longer increments refresh_state for entity kind 3

🤖 Generated with Claude Code

Note

Prevent refresh_state cursor increment when commit log publishing is disabled

• Changes the XmtpMlsClient::publish_commit_log trait method to return Result<bool> instead of Result<()>, where false signals a no-op (e.g. commit log disabled) and true signals successful publication.
• The d14n client in d14n/mls.rs now explicitly returns Ok(false) with a debug log when commit log publishing is disabled.
• CommitLogWorker::publish_commit_logs_to_remote in commit_log.rs skips updating upload cursors when the API returns false, preventing cursor advancement on no-op publishes.
• Behavioral Change: all XmtpMlsClient implementors must now handle a boolean return from publish_commit_log; the v3 client returns Ok(true) on success.

^{Macroscope summarized fc58d64.}

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.07%. Comparing base (bc560bb) to head (fc58d64).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/xmtp_api_d14n/src/queries/combined.rs	0.00%	1 Missing ⚠️
crates/xmtp_proto/src/api_client/impls.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3416      +/-   ##
==========================================
+ Coverage   83.06%   83.07%   +0.01%     
==========================================
  Files         378      378              
  Lines       51829    51834       +5     
==========================================
+ Hits        43050    43061      +11     
+ Misses       8779     8773       -6     

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