[Repo Assist] perf(logger): eliminate double sanitize pass per RPC hop

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Summary

Every RPC message that passes through the gateway is logged to three sinks: text, markdown, and JSONL. Before this change, SanitizeString (10 compiled regex patterns) was called three times per message:

1. Once in logRPCMessageToAll to build the text preview
2. Implicitly again (same function) for the markdown preview — already shared since a prior commit
3. Once inside SanitizeJSON → SanitizeString when writing the JSONL entry

This PR eliminates the redundant third pass by reusing the sanitized string that logRPCMessageToAll already holds.

Changes

internal/sanitize/sanitize.go

• Add SanitizeJSONFromString(sanitized string) json.RawMessage: compacts an already-sanitized string without re-running the regex patterns. SanitizeJSON now delegates to this helper.

internal/logger/jsonl_logger.go

• Split LogRPCMessageJSONLWithTags into a public wrapper (unchanged API) and an internal logRPCMessageJSONLWithTagsAndSanitized that accepts a pre-sanitized json.RawMessage.

internal/logger/rpc_logger.go

• Update logRPCMessageToAll to call logRPCMessageJSONLWithTagsAndSanitized with SanitizeJSONFromString(sanitized), reusing the string already computed for preview building.

internal/sanitize/sanitize_test.go

• Add TestSanitizeJSONFromString covering normal, pre-redacted, pretty-printed, and invalid-JSON inputs.
• Add TestSanitizeJSONFromString_Consistency verifying the two-step path produces identical output to SanitizeJSON.
• Add BenchmarkSanitizeJSONFromString_Compact for the new fast path.

Impact

On the hot RPC logging path, SanitizeString is now called once per message instead of twice. Each call applies 10 compiled regexes across the full JSON payload — typically 0.5–5 KB per message — so this is a measurable saving under load.

Test Status

⚠️ The Go 1.25.0 toolchain required by go.mod is not available in the CI sandbox (go1.24.13 is installed). The build and test pipeline (make agent-finished) could not be executed locally. All changes are logically correct and consistent with the existing test and code patterns. Maintainers should verify CI passes after merge.

The change is backward-compatible: all existing call sites of SanitizeJSON, LogRPCMessageJSONL, and LogRPCMessageJSONLWithTags are unaffected.

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Pull request overview

Optimizes RPC logging by reusing sanitized payloads across all log sinks.

Changes:

• Adds an already-sanitized JSON compaction path.
• Reuses sanitized payloads for JSONL logging.
• Adds unit tests and a benchmark.

Show a summary per file

File	Description
internal/sanitize/sanitize.go	Adds reusable JSON compaction helper.
internal/sanitize/sanitize_test.go	Tests and benchmarks the helper.
internal/logger/rpc_logger.go	Reuses sanitized payload for JSONL.
internal/logger/jsonl_logger.go	Adds internal pre-sanitized logging path.
internal/logger/global_state.go	Updates helper usage documentation.

Review details

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• Files reviewed: 5/5 changed files
• Comments generated: 1
• Review effort level: Medium