chore: consolidate Docs/ into docs/ (single documentation directory)

Move UML/ directory and Architecture.md from Docs/ to docs/.
Rename Architecture.md to UML_ARCHITECTURE.md to avoid collision
with existing docs/ARCHITECTURE.md (docs organization file).

Update all references in README.md, CONTRIBUTING.md, CLAUDE.md,
and the architecture file itself.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -8,7 +8,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 **Version:** 3.3.0 | **Python:** 3.10+ | **Website:** https://skillseekersweb.com/
 
-**Architecture:** See `Docs/Architecture.md` for UML diagrams and module overview. StarUML project at `Docs/UML/skill_seekers.mdj`.
+**Architecture:** See `docs/UML_ARCHITECTURE.md` for UML diagrams and module overview. StarUML project at `docs/UML/skill_seekers.mdj`.
 
 ## Essential Commands
 

CONTRIBUTING.md

@@ -500,10 +500,10 @@ Skill_Seekers/
 
 Full UML class diagrams are maintained in StarUML and synced from source code:
 
-- **[Docs/Architecture.md](Docs/Architecture.md)** - Overview with embedded PNG diagrams
-- **[Docs/UML/skill_seekers.mdj](Docs/UML/skill_seekers.mdj)** - StarUML project (open with [StarUML](https://staruml.io/))
-- **[Docs/UML/exports/](Docs/UML/exports/)** - 14 PNG exports (package overview + 13 class diagrams)
-- **[Docs/UML/html/](Docs/UML/html/index.html/index.html)** - HTML API reference
+- **[docs/UML_ARCHITECTURE.md](docs/UML_ARCHITECTURE.md)** - Overview with embedded PNG diagrams
+- **[docs/UML/skill_seekers.mdj](docs/UML/skill_seekers.mdj)** - StarUML project (open with [StarUML](https://staruml.io/))
+- **[docs/UML/exports/](docs/UML/exports/)** - 14 PNG exports (package overview + 13 class diagrams)
+- **[docs/UML/html/](docs/UML/html/index.html/index.html)** - HTML API reference
 
 **Key design patterns documented in UML:**
 - Strategy + Factory in Adaptors (SkillAdaptor ABC + 20+ implementations)

README.md

@@ -916,7 +916,7 @@ graph LR
 
 The system is organized into **8 core modules** and **5 utility modules** (~200 classes total):
 
-![Package Overview](Docs/UML/exports/00_package_overview.png)
+![Package Overview](docs/UML/exports/00_package_overview.png)
 
 | Module | Purpose | Key Classes |
 |--------|---------|-------------|
@@ -931,7 +931,7 @@ The system is organized into **8 core modules** and **5 utility modules** (~200
 
 Utility modules: **Parsers** (28 CLI parsers), **Storage** (S3/GCS/Azure), **Embedding** (multi-provider vectors), **Benchmark** (performance), **Utilities** (16 shared helpers).
 
-Full UML diagrams: **[Docs/Architecture.md](Docs/Architecture.md)** | StarUML project: `Docs/UML/skill_seekers.mdj` | HTML API reference: `Docs/UML/html/`
+Full UML diagrams: **[docs/UML_ARCHITECTURE.md](docs/UML_ARCHITECTURE.md)** | StarUML project: `docs/UML/skill_seekers.mdj` | HTML API reference: `docs/UML/html/`
 
 ## 📋 Prerequisites
 
@@ -1201,10 +1201,10 @@ skill-seekers config --github
 - **[docs/QUICK_REFERENCE.md](docs/QUICK_REFERENCE.md)** - One-page cheat sheet
 
 ### Architecture
-- **[Docs/Architecture.md](Docs/Architecture.md)** - UML architecture overview with 14 diagrams
-- **[Docs/UML/exports/](Docs/UML/exports/)** - PNG diagram exports (package overview + 13 class diagrams)
-- **[Docs/UML/html/](Docs/UML/html/index.html/index.html)** - Full HTML API reference (all classes, operations, attributes)
-- **[Docs/UML/skill_seekers.mdj](Docs/UML/skill_seekers.mdj)** - StarUML project file (open with [StarUML](https://staruml.io/))
+- **[docs/UML_ARCHITECTURE.md](docs/UML_ARCHITECTURE.md)** - UML architecture overview with 14 diagrams
+- **[docs/UML/exports/](docs/UML/exports/)** - PNG diagram exports (package overview + 13 class diagrams)
+- **[docs/UML/html/](docs/UML/html/index.html/index.html)** - Full HTML API reference (all classes, operations, attributes)
+- **[docs/UML/skill_seekers.mdj](docs/UML/skill_seekers.mdj)** - StarUML project file (open with [StarUML](https://staruml.io/))
 
 ### Guides
 - **[docs/LARGE_DOCUMENTATION.md](docs/LARGE_DOCUMENTATION.md)** - Handle 10K-40K+ page docs