Reduce debug trace noise and add safe outcomes

[Wibias]

Summary

Addresses the final trace-efficiency findings from the Grok delivery run:

• coalesces adjacent reasoning-summary deltas with the same trace identity instead of writing thousands of tiny JSONL records;
• preserves ordering by flushing at identity and non-reasoning event boundaries;
• enriches sanitised item_completed events with bounded outcome, durationMs, and errorKind metadata;
• keeps raw tool inputs, outputs, error messages, paths, and other sensitive payloads out of the trace.

Regression evidence

RED-first coverage reproduced both the record explosion and missing completion diagnostics. Provider and recorder tests also verify that sensitive terminal payloads remain excluded.

Verification

Exact head: f06c22ce85db09c818e4107e3ce6d4b0184089de

• CI: success
• Dependency Review: success
• Windows trace bins: success
• CodeQL: success

Scope

Debug trace efficiency and diagnostics only. No workflow, publication, mutation, or controller semantics are changed here.

Ready for review. Do not merge without explicit instruction.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 734f933f-3b77-462f-91df-88b8f64bd62d

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