feat(plt): Migrate scitex.plt utilities to figrecipe

[ywatanabe1989]

Summary

Migrate scitex.plt utility modules to figrecipe to maintain single source of truth.

Background

figrecipe is now the canonical source for:

• Diagram functionality (done in feat(diagram): Delegate diagram functionality to figrecipe #122)
• Plotting/recipe MCP tools (done)

However, scitex.plt still contains utility modules that should live in figrecipe:

scitex/plt/
├── color/          # Color conversion, palettes, gradients
├── styles/         # Publication style presets
├── ax/             # Axis formatting utilities
├── utils/          # General plotting utilities
├── _subplots/      # Subplot management
├── io/             # Figure I/O

Proposed Migration

Phase 1: Color utilities

• Move scitex.plt.color → figrecipe.color
• Functions: str2rgb, rgb2rgba, rgba2hex, gradiate_color_rgb, etc.
• Update scitex to re-export from figrecipe

Phase 2: Style utilities

• Move scitex.plt.styles → figrecipe.styles (extend existing)
• Publication presets, journal-specific configs

Phase 3: Axis utilities

• Move scitex.plt.ax → figrecipe.axes
• Axis formatting, tick styling, label management

Phase 4: General utilities

• Move scitex.plt.utils → figrecipe.utils
• Move scitex.plt.io → figrecipe.io

Phase 5: Cleanup

• Remove migrated code from scitex
• Update imports to use figrecipe
• Update documentation

Benefits

• Single source of truth for all plotting functionality
• Reduced code duplication
• Clearer separation: scitex = scientific workflow, figrecipe = plotting

Related

• feat(diagram): Delegate diagram functionality to figrecipe #122 (diagram delegation - completed)
• figrecipe repository: https://github.com/ywatanabe1989/figrecipe

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