…llation

Complete redesign of internationalization architecture eliminating runtime
overhead and simplifying installation workflow.

Changes:

1. Static Message Patching System
   - Add patch-statusline.sh for build-time message compilation
   - Replace runtime config loading with @CONFIG_START/@CONFIG_END blocks
   - Replace runtime message loading with @MESSAGES_START/@MESSAGES_END blocks
   - Hardcode SHOW_MESSAGES/SHOW_COST flags as readonly constants
   - Refactor get_context_message() to use bash arrays (not pipe-delimited strings)
   - Performance: Eliminates 3-5ms i18n overhead (~100ms → ~95ms)

2. Simplify Message Format
   - Migrate from bash (.sh) to JSON format
   - Remove metadata and nested .tiers structure
   - Flatten to simple tier-to-array mapping
   - Remove backward compatibility code (~200 lines)
   - Breaking change: JSON-only format (no migration)

3. SKILL-based Installation
   - Add skills/install-statusline/SKILL.md (257 lines)
   - Remove install.sh (798 lines) and install.ps1 (548 lines)
   - Unified installation workflow via Claude Code SKILL system

4. Cross-Platform Fixes
   - Strip CRLF line endings from jq output (Windows Git Bash)
   - Force C locale for printf decimal formatting (LC_NUMERIC=C)
   - Preserve executable permissions during patching (chmod --reference)
   - Fix CI test environment compatibility

5. Test Suite Improvements
   - Consolidate redundant tests (76 unit + 24 integration = 90 total)
   - Remove circular tests (functions only in test file)
   - Add fixture-based integration test
   - Achieve 100% pass rate
   - Update for static patching (remove runtime loading tests)

6. Documentation Updates
   - CLAUDE.md: Reflect static patching architecture
   - README.md: Add patch-statusline.sh usage examples
   - messages/README.md: Document simplified JSON format

Net changes: -1217 lines deleted, +830 lines added

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>