refactor: split AnalyzeProject into pipeline components

Split 615-line God Use-Case into focused pipeline components:
- FileCollectionStep.ts (66 lines) - file scanning and basic parsing
- ParsingStep.ts (51 lines) - AST parsing and dependency graph
- DetectionPipeline.ts (371 lines) - all 7 detectors
- ResultAggregator.ts (81 lines) - response DTO builder

Reduced AnalyzeProject.ts from 615 to 245 lines (60% reduction).

All 345 tests pass, no breaking changes.
Improved separation of concerns and testability.

Closes #0.7.5 roadmap task.

packages/guardian/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@samiyev/guardian",
-    "version": "0.7.5-beta.1",
+    "version": "0.7.5",
     "description": "Research-backed code quality guardian for AI-assisted development. Detects hardcodes, circular deps, framework leaks, entity exposure, and 8 architecture violations. Enforces Clean Architecture/DDD principles. Works with GitHub Copilot, Cursor, Windsurf, Claude, ChatGPT, Cline, and any AI coding tool.",
     "keywords": [
         "puaros",