Add new images and documentation updates; remove sensitive files

- Added new images related to architecture and development.
- Updated paths in various markdown files to correct resource locations.
- Created new markdown files for Python development topics.
- Deleted outdated and sensitive files, moving them to a secure archive.
- Added a README for the security-sensitive files archive with recommendations for handling sensitive information.

100-project/Personal/PKM/PARA/PKM-Consolidation-Decision.md

@@ -0,0 +1,39 @@
+# PKM Content Organization - Decision Note
+
+## Analysis (2025-12-29)
+
+After reviewing both locations containing PARA methodology content:
+- **[300-resources/Personal Knowledge Management](300-resources/Personal Knowledge Management)** - 8 files (course notes, references, essays)
+- **[100-project/Personal/PKM/PARA](100-project/Personal/PKM/PARA)** - 3 files (implementation guide)
+
+## Decision: Keep Current Structure
+
+**Rationale:**
+1. **Different purposes, complementary content:**
+   - `300-resources/PKM/` contains **source material** from BASB courses, external essays, and learning references
+   - `100-project/PKM/PARA/` contains **implementation documentation** specific to this vault's setup
+
+2. **PARA principle alignment:**
+   - Resources = generally useful reference material (course notes, methodology explanations)
+   - Projects = active work on implementing/customizing the system
+
+3. **Content breakdown:**
+   - **300-resources/PKM/** (Reference material):
+     - BASB Class 7 & 8 notes (course content)
+     - PARA Notes.md & PARA Notes from class.md (methodology reference)
+     - Gregory Gundersen essay (writing philosophy)
+     - Dickens deep work (anecdote)
+     - Images.md (visual references)
+   
+   - **100-project/PKM/PARA/** (Implementation):
+     - Methodology.md (how to apply in Obsidian)
+     - Workflows.md (practical examples for this vault)
+     - Outline.md (project plan)
+
+## Cleanup Actions Taken
+
+✅ Moved arc42 from `300-resources/PKM/` to `300-resources/Development/Architecture/` (was misplaced)
+
+## Recommendation
+
+No merge needed. The two locations serve distinct purposes and should remain separate. If PKM project becomes inactive, move implementation docs to `200-area/Personal Development/` (ongoing learning responsibility) and keep course references in `300-resources/`.