wip: Phase 0 Xdebug profiling setup and analysis tools

- Phase0-ProfilingResults.md: Document profiling process and status
- analyze-cachegrind.py: Custom tool to parse Xdebug cachegrind profiles
- Enabled Xdebug v3.4.5 profiling mode
- Generated 10K record test file for profiling
- Running profiled import to capture bottleneck data

Profiling in progress: Will update with complete results once analysis
finishes. This real-world profiling validates the 99% database bottleneck
hypothesis before implementing DBAL bulk insert optimization.

Goal: Confirm >90% time in database operations to proceed with Phase 1-6
async queue implementation with DBAL optimization.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: CybotTM

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