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TIER-2 READ conductor/code_styleguides/error_handling.md end-to-end before Phase 0. Phase 0 covered: - t0.1 [bf94fb2]: Update conductor/tracks.md (ready to start -> active 2026-06-19) - t0.2 [62188d6]: Styleguide re-read (empty commit acknowledging AI Agent Checklist Rule #0) - t0.3 [this commit]: Phase 0 checkpoint; state.toml Phase 0 status -> completed Phase 0 establishes the anti-sliming protocol for the 42 migration-target sites in src/gui_2.py. Each subsequent phase starts with a styleguide re-read + ack in the commit message (Rule #0 enforcement).