Add sanitized parse-error report mode

[qingfeng312]

Summary

• Adds --parse-error-report to tools/log_aggregator.py for sanitized JSON parser failure reporting.
• Captures parser type, file path, line number, and redacted error text without changing the normal parsed-log output.
• Adds a focused smoke script covering malformed JSON, non-object JSON, valid JSON, and text fallback logs.
• Includes the generated diagnostic JSON from python3 build.py; no encrypted .logd artifact was produced locally.

/claim #1
Closes #1

Testing

• python3 -m py_compile tools/log_aggregator.py tools/log_aggregator_parse_error_smoke.py
• python3 tools/log_aggregator_parse_error_smoke.py
• git diff --check
• python3 build.py generated diagnostic/build-2b54872c.json; frontend and v2-market-stream passed, while backend/market/engine/compliance/nfc/openapi modules failed locally because required toolchains or platform-specific build support were unavailable (cargo, go, cmake, Java runtime, luac, ghc, and macOS MAP_HUGETLB).

Checklist

• I ran the focused validation commands above.
• I included the generated diagnostic JSON.
• I included an encrypted .logd artifact. It was not created by the local build run; the included diagnostic JSON records the failure.