feat: Add discoverable 'analyze' subcommand with preset flags (Phase 1 UX improvement)

Implements Phase 1 of the codebase analysis UX improvement plan, making the
command discoverable and adding intuitive preset flags while maintaining 100%
backward compatibility.

New Features:
- Add 'analyze' subcommand to main CLI (skill-seekers analyze)
- Add --quick preset: Fast analysis (1-2 min, basic features only)
- Add --comprehensive preset: Full analysis (20-60 min, all features + AI)
- Add --enhance flag: Simple AI enhancement with auto-detection
- Improve help text with timing estimates and mode descriptions

Files Modified:
- src/skill_seekers/cli/main.py: Add analyze subcommand (lines 15, 273-311, 542-589)
- src/skill_seekers/cli/codebase_scraper.py: Add preset logic and improve help text
- tests/test_analyze_command.py: NEW - 20 comprehensive tests
- tests/test_cli_paths.py: Fix version check (2.7.0 -> 2.7.2)
- tests/test_package_structure.py: Fix 4 version checks (2.7.0 -> 2.7.2)
- README.md: Update examples to use 'analyze' command
- CLAUDE.md: Update examples to use 'analyze' command

Test Results:
- 81 tests related to Phase 1: ALL PASSING ✅
- 20 new tests for analyze command: ALL PASSING ✅
- Zero regressions introduced
- 100% backward compatibility maintained

Backward Compatibility:
- Old 'skill-seekers-codebase' command still works
- All existing flags (--depth, --ai-mode, --skip-*) still functional
- No breaking changes

Usage Examples:
  skill-seekers analyze --directory . --quick
  skill-seekers analyze --directory . --comprehensive
  skill-seekers analyze --directory . --enhance

Fixes #262 (codebase UX issues)

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

CLAUDE.md

@@ -173,7 +173,7 @@ skill-seekers github --repo owner/repo --non-interactive         # CI/CD mode
 skill-seekers scrape --config configs/react.json --dry-run
 
 # Test codebase analysis (C2.x features)
-skill-seekers codebase --directory . --output output/codebase/
+skill-seekers analyze --directory . --output output/codebase/
 
 # Test pattern detection (C3.1)
 skill-seekers patterns --file src/skill_seekers/cli/code_analyzer.py
@@ -283,14 +283,17 @@ The project has comprehensive codebase analysis capabilities (C3.1-C3.8):
 
 **C3.8 Standalone Codebase Scraper** (`codebase_scraper.py`):
 ```bash
-# All C3.x features enabled by default, use --skip-* to disable
-skill-seekers codebase --directory /path/to/repo
+# Quick analysis (1-2 min, basic features only)
+skill-seekers analyze --directory /path/to/repo --quick
+
+# Comprehensive analysis (20-60 min, all features + AI)
+skill-seekers analyze --directory . --comprehensive
+
+# With AI enhancement (auto-detects API or LOCAL)
+skill-seekers analyze --directory . --enhance
 
 # Disable specific features
-skill-seekers codebase --directory . --skip-patterns --skip-how-to-guides
-
-# Legacy flags (deprecated but still work)
-skill-seekers codebase --directory . --build-api-reference --build-dependency-graph
+skill-seekers analyze --directory . --skip-patterns --skip-how-to-guides
 ```
 
 - Generates 300+ line standalone SKILL.md files from codebases