feat: Add sanitized parse-error reports for log aggregation (closes #1)

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Parse Error Reporting for Log Aggregation

This PR adds a --parse-error-report PATH CLI option that writes a JSON summary of parse failures.

Changes:

• Added ParseErrorReporter class for collecting parse errors
• Added _sanitize_error_message() to remove secrets and sensitive data
• Added _parse_json_line() and _parse_plaintext_line() with error reporting
• Added comprehensive tests

Acceptance Criteria:

• --parse-error-report PATH writes JSON summary
• Records parser type, file path, line number, sanitized error
• No raw log lines or secrets in report
• Existing outputs backward compatible
• Tests for valid/malformed logs

Test Results:

✓ Sanitize test passed
✓ JSON parse test passed
✓ Report generation test passed
All tests passed!

Usage:

python3 tools/log_aggregator.py --input logs/*.log --parse-error-report errors.json

Closes #1

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Bounty: $40
Lightning Address: fullphone56@walletofsatoshi.com