perf(server): drop transient native events from provider logs

[leoisadev1]

What Changed

Provider event logs no longer persist streaming chunks that cannot change thread state: Codex item/realtime deltas, Claude content-block deltas, ACP agent_message_chunk/agent_thought_chunk, and OpenCode text/reasoning part updates. Writes push into the pending buffer instead of copying it. ACP request diagnostics stay on; full protocol logging is opt-in through the Cursor and Grok provider settings and applies the same chunk filter.

Why

Native streams currently write every delta into thread-scoped ndjson files. Canonical events already drop content.delta and similar types. Native events did not, so the files grew with records nobody reads. Remaining pingdotgg#8187 logging work, kept off #230 (narrow projection queries) and off #203 (async log drains).

EventNdjsonLogger.ts is shared with OPEN #203. This PR only changes persist filters and pending-buffer mutation. It does not rewrite drain/close.

Out of scope here: OpenCode adapter text merge, native telemetry sampling, GitVcsDriver Trace2 decode, RepositoryIdentityResolver root cache (already local).

UI Changes

None.

Checklist

• This PR is small and focused
• I explained what changed and why
• I linked the accepted plugin or provider proposal in Why, or this PR does not add one
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Verification

• Focused event logger, ACP logging, and settings suites — 94 passed
• Cursor and Grok adapter integration checks for the verbose logging setting — 2 passed
• Scoped lint on changed files — clean apart from one pre-existing unused settings-test helper warning
• Server and contracts typechecks — suggestions only, no errors

Grok 4.6 High via Grok Build authored the change. Codex gpt-5.6-sol in T3 Code completed the review fixes.

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Project	Deployment	Actions	Updated
akeru-bot-landing	Building	Preview	Sep 10, 2026 6:14pm UTC

[greptile-apps]

Greptile Summary

This PR reduces provider log volume by dropping transient native streaming events before serialization and makes full ACP protocol diagnostics explicitly configurable.

• Filters transient Codex, Claude, ACP, and OpenCode native events while retaining durable lifecycle records.
• Adds opt-in verbose protocol logging settings for Cursor and Grok.
• Preserves default ACP request diagnostics and filters transient entries from verbose protocol logs.
• Mutates the serialized pending buffer in place while retaining synchronized drain behavior.
• Adds focused coverage for filtering, settings decoding, and adapter wiring.

Confidence Score: 5/5

Merge-safe. No outstanding blocking issues remain.

No accepted new findings or outstanding previous findings remain. The previous ACP protocol logging concern is fully addressed because both Cursor and Grok forward the configured verbose protocol logging setting into ACP native logger construction.

_{Reviews (2): Last reviewed commit: "Merge remote-tracking branch 'origin/mai..." | Re-trigger Greptile}