test(tools): add independent log parser fixtures (#5)

[yanyishuai]

Summary

Independent hand-written log parser fixtures + unit tests for tools/log_aggregator.py (issue #5).

Acceptance criteria (#5)

• Independent fixtures: JSON, plain text, nginx-style lines (tools/tests/fixtures/log_parser/)
• Tests verify timestamp, level, service/format, key fields
• Malformed line case does not crash parsing
• No production parser behavior change unless fixture exposes a bug
• python build.py -m compliance diagnostic included (diagnostic/build-bf2147ac.logd)

Testing

python -m unittest tools.tests.test_log_parser_fixtures -v
python build.py -m compliance

Closes #5

Solana wallet for bounty payout: Do4v7foHJvRJLpRRoGaVPWX6DDEjX3yTK7J91gpwUQpE

[yanyishuai]

Bounty submission ready for review. Independent parser fixtures + unit tests pass; build diagnostic included in PR. Happy to address feedback quickly.

[yanyishuai]

Updated with acceptance criteria checklist, independent fixtures, and build diagnostic. Ready for review.

[yanyishuai]

External bounty ready for maintainer review — acceptance criteria documented in PR body. Happy to address feedback immediately.