feat(style): Add anti-OOP conventions and OOP refactoring tracker

- Add section 10 (Anti-OOP Conventions) to python.md with hard rules,
  class justification requirements, and Strangler Fig refactoring pattern
- Create conductor/refactor_oop.md tracker with 4 phases for class elimination
- Add ruff PLR rules (PLR0912, PLR6301, PLR0206) to pyproject.toml for
  OOP anti-patterns

Addresses AI agent scope misinterpretation issues by enforcing flat
function-call graphs over deep class hierarchies.

conductor/refactor_oop.md

@@ -0,0 +1,55 @@
+# OOP Refactoring Tracker
+
+Tracks elimination of class-based OOP from the codebase to reduce AI agent scope misinterpretation.
+
+## Status: IN PROGRESS
+
+## Phase 1: Leaf Classes (No internal dependents)
+These classes have no dependencies on other classes being refactored. Start here.
+
+- [ ] `src/tool_bias.py` - ToolBiasEngine → module functions + dict
+- [ ] `src/session_logger.py` - SessionLogger → module-level functions
+- [ ] `src/summarize.py` - SummaryCache class → plain dict + functions
+
+## Phase 2: Internal Classes (Depend on Phase 1)
+These classes use Phase 1 classes. Refactor Phase 1 first.
+
+- [ ] `src/project_manager.py` - ProjectManager class
+- [ ] `src/aggregate.py` - Aggregator class
+
+## Phase 3: Core Classes (High risk - many callers)
+These have many dependents. Handle last with extra testing.
+
+- [ ] `src/ai_client.py` - AI client classes (AIProvider, etc.)
+- [ ] `src/mcp_client.py` - MCPClient, ToolRegistry
+- [ ] `src/models.py` - Data classes → dataclass/NamedTuple
+
+## Phase 4: GUI Classes (Highest risk)
+Classes used in GUI callbacks. Require live testing.
+
+- [ ] `src/gui_2.py` - Main GUI class, panel classes
+
+## Anti-Regression Protocol
+
+Before refactoring ANY class:
+
+1. **Write test** that validates current behavior
+2. **Commit baseline** with `test(baseline): add baseline for <class>`
+3. **Extract method** into module-level function
+4. **Update all callers** to use function directly
+5. **Run test** - must pass identically
+6. **Commit extraction** with `refactor(oop): extract <method> from <Class>`
+7. **Delete class** only when ALL methods extracted
+
+## Progress Log
+
+### 2026-05-11
+- Initial tracker created
+- Anti-OOP conventions added to `conductor/code_styleguides/python.md`
+- Ruff PLR rules added to `pyproject.toml`
+
+## Notes
+
+- Use Strangler Fig pattern: keep class working until last caller migrated
+- Prefer `dict`/`NamedTuple` over classes for data containers
+- Classes with only data: convert to `dataclass(frozen=True)` or `NamedTuple`