Created detailed design document for implementing proper color support
in tempComplexRegexTrigger by converting string color names to ANSI codes.

Key design elements:
- Color string to ANSI code conversion using RGB distance matching
- Backward compatibility with numeric ANSI codes
- Support for named colors, hex colors, and special values
- Modified tempComplexRegexTrigger to accept both numbers and strings
- Proper color storage using setupColorTrigger()

Includes:
- Complete code examples and function signatures
- Implementation strategy with color matching algorithm
- File modification list (Host.h, Host.cpp, TLuaInterpreterMudletObjects.cpp)
- Challenges: color approximation, performance, user expectations
- Possible improvements: CIE Delta E, caching, KD-tree optimization
- Testing strategy with unit and integration test examples
- Documentation requirements
- Effort estimation: 9-13 hours total

Documented in OPTION-B-DESIGN.md for evaluation against simpler
Option A (deprecating the non-functional parameters).

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…t#2574)

Fixes GitHub issue Mudlet#2574 where tempComplexRegexTrigger arguments 5 and 6
(foreground/background colors) were read but never stored, making them
completely non-functional.

Implementation (Option B with exact matching):

1. Added Host::colorNameToAnsiCode() (Host.h:334, Host.cpp:2635-2696)
   - Converts color name strings to ANSI codes (0-15)
   - Supports basic 16 ANSI colors with multiple naming variations
   - Special values: "default", "ignore"
   - Case-insensitive matching
   - Returns pair<success, code> for error handling
   - Exact matching only - returns false for unrecognized names

2. Modified tempComplexRegexTrigger() (TLuaInterpreterMudletObjects.cpp:2206-2366)
   - Now accepts BOTH numeric ANSI codes AND color name strings
   - Validates numeric codes are in valid range (0-255, scmIgnored, scmDefault)
   - Converts color names to ANSI codes using Host::colorNameToAnsiCode()
   - Returns nil + error message for invalid color names
   - Validates at least one color is set (not both "ignore")

3. Added setupColorTrigger() call (TLuaInterpreterMudletObjects.cpp:2357-2366)
   - THE CRITICAL FIX: actually stores color values in trigger object
   - Creates TColorTable and adds to mColorPatternList
   - This is what was missing in the original broken implementation

Backward compatibility: 100% compatible with existing code using numeric
ANSI codes. New functionality: accepts color names like "red", "blue",
"light_green", etc.

Supported colors: black, red, green, yellow, blue, magenta, cyan, white,
light_black/gray/grey, light_red, light_green, light_yellow, light_blue,
light_magenta, light_cyan, light_white, plus "default" and "ignore".

Error handling: Returns nil + descriptive error message for unrecognized
color names instead of silently failing.

Detailed documentation in FIX-ISSUE-2574-IMPLEMENTATION.md

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Added comprehensive Busted/Lua test suite for the tempComplexRegexTrigger
color functionality fix (issue Mudlet#2574).

Test coverage includes:

1. Color name string support:
   - All basic 16 ANSI colors (black, red, green, yellow, blue, magenta, cyan, white)
   - All light/bright color variations (light_red, lightred, "light red")
   - Gray/grey aliases for light_black
   - Special values: "default", "ignore"
   - Case insensitivity (RED, Red, red all work)

2. Numeric ANSI code support (backward compatibility):
   - Basic ANSI codes 0-15
   - Extended ANSI codes 16-255
   - Special values -1 (scmDefault) and -2 (scmIgnored)
   - Validation of invalid codes (> 255, < -2)

3. Mixed numeric and string support:
   - Numeric fg + string bg
   - String fg + numeric bg
   - Both numeric
   - Both string

4. Error handling:
   - Invalid color names (purple, orange, pink, brown)
   - Returns nil + descriptive error message
   - Error messages suggest valid alternatives

Test file: src/mudlet-lua/tests/TriggerColor_spec.lua
Total test cases: 35+ covering all aspects of the fix

Tests follow Mudlet's Busted testing conventions:
- Uses describe() for test grouping
- Uses setup()/teardown() for test fixtures
- Uses it() for individual test cases
- Mocks the C++ tempComplexRegexTrigger function for pure Lua testing

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Changed tempComplexRegexTrigger API to require special values "default"
and "ignore" to be passed as strings instead of numeric codes -1 and -2.

Rationale:
- More readable: "default" is clearer than -1
- Consistent: Aligns with new string color API ("red", "blue", etc.)
- Type-safe: Prevents confusion between ANSI codes and special values
- No breaking changes: Feature has been broken since 2019

API changes:
- Numbers: Only accept 0-255 (valid ANSI color codes)
- Strings: Accept color names and special values "default"/"ignore"
- Reject: -1, -2, and any negative numbers

Updated code:
1. TLuaInterpreterMudletObjects.cpp:
   - Changed validation to reject negative numbers
   - Updated error messages to guide users to use strings
   - Removed checks for scmIgnored (-2) and scmDefault (-1) in numeric path

2. TriggerColor_spec.lua:
   - Replaced tests for -1/-2 with rejection tests
   - Updated mock functions to match new validation
   - All tests now use "default"/"ignore" strings for special values

3. FIX-ISSUE-2574-IMPLEMENTATION.md:
   - Added "Why Strings for default/ignore" section
   - Clarified API with examples of correct/incorrect usage
   - Updated all code examples to use strings

Examples:
```lua
-- ✅ CORRECT
tempComplexRegexTrigger("test", ".*", func, 0, "default", "ignore", ...)
tempComplexRegexTrigger("test", ".*", func, 0, 1, "blue", ...)

-- ❌ WRONG (will error)
tempComplexRegexTrigger("test", ".*", func, 0, -1, -2, ...)
```

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Added extensive Busted test suite for the string special values
"default" and "ignore" in tempComplexRegexTrigger color arguments.

New test coverage (21 additional tests):

1. **'default' string tests:**
   - As foreground color
   - As background color
   - For both fg and bg
   - Case insensitivity (DEFAULT, Default, dEfAuLt, default)

2. **'ignore' string tests:**
   - As foreground color (with bg set)
   - As background color (with fg set)
   - Case insensitivity (IGNORE, Ignore, iGnOrE, ignore)

3. **Combination tests with regular colors:**
   - 'default' fg + color name bg
   - Color name fg + 'default' bg
   - 'ignore' fg + 'default' bg
   - 'default' fg + 'ignore' bg

4. **Combination tests with numeric ANSI codes:**
   - 'default' fg + numeric bg
   - Numeric fg + 'default' bg
   - 'ignore' fg + numeric bg
   - Numeric fg + 'ignore' bg

5. **Rejection tests for numeric -1/-2:**
   - Numeric -1 for fg (must use string 'default')
   - Numeric -2 for fg (must use string 'ignore')
   - Numeric -1 for bg (must use string 'default')
   - Numeric -2 for bg (must use string 'ignore')

Total test file size: 625 lines (added ~210 lines)
Test describe blocks: 5 (added dedicated section for special values)

All tests validate that:
- String special values work correctly
- Numeric -1 and -2 are properly rejected
- Error messages guide users to use strings
- Case insensitivity is maintained
- Combinations with colors and numbers work

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Moved all tempComplexRegexTrigger color support tests from the standalone
TriggerColor_spec.lua into the existing Miscallaneous_spec.lua file.

Rationale:
- Miscallaneous_spec.lua is for "C++ functions in the Miscallaneous category"
- tempComplexRegexTrigger is a C++ Lua API function
- Avoids creating a new spec file for a single C++ function
- Keeps related tests together (other C++ API functions)

Changes:
- Deleted: src/mudlet-lua/tests/TriggerColor_spec.lua (546 lines)
- Modified: src/mudlet-lua/tests/Miscallaneous_spec.lua
  - Before: 40 lines (only getOS tests)
  - After: 584 lines (getOS + tempComplexRegexTrigger tests)

All test describe blocks:
- Tests the functionality of getOS (existing)
- Tests color name string support (moved)
- Tests special string values 'default' and 'ignore' (moved)
- Tests numeric ANSI code support (moved)
- Tests mixed numeric and string color support (moved)
- Tests error handling for invalid color names (moved)

Test count unchanged: 43 tests total

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