feat: add rectangular selection with fill/stroke (Fixes #7) [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]

[waterWang]

Summary

Add rectangular selection support with fill and stroke operations to the gimp-mcp server.

Changes

• Backend: Added , , , , methods to MockBackend with selection state tracking
• Protocol: Updated protocol with selection method signatures
• MCP Tools: Added , , , , tools
• Tests: 12 new tests covering all selection operations, edge cases (no selection, unknown image), and error handling
• Cleanup: Removed BOM characters from source files that caused SyntaxError

Usage

1. gimp_select_rect(image_id, x, y, width, height) — create a rectangular selection
2. gimp_fill_selection(image_id, color) — fill the selection with color
3. gimp_stroke_selection(image_id, color, width) — stroke the selection border
4. gimp_get_selection(image_id) — query current selection bounds
5. gimp_clear_selection(image_id) — clear the active selection

Test Results

All 12 new selection tests pass. Full test suite: 30 passed, 3 pre-existing failures (missing fixture file).

Fixes #7

[laurentketterle-hub]

QA Verification — gimp-mcp#30

PR: feat: add rectangular selection with fill/stroke (Fixes #7) [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]
Author: @waterWang | SHA: 524ba3b

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