fix(docs): critical factual corrections v3.6.1

Major audit correcting misleading documentation about Claude Code behavior:

### Fixed
- `--add-dir`: permissions (not context loading)
- `excludePatterns` → `permissions.deny` (never existed)
- `.claudeignore` removed (not an official feature)
- "selective loading" myth → lazy loading reality
- Invented CLI flags (`--think`, `--headless`, `--learn`) → prompt keywords
- `@` file reference: "loads automatically" → "reads on-demand"

### Added
- Session Search Tool (`cs`) - zero-dep bash script for finding sessions
- Security section: Known limitations of permissions.deny

15 files modified, 516 insertions, 200 deletions

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

quiz/questions/01-quick-start.yaml

@@ -82,7 +82,7 @@ questions:
       d: "Activates an agent"
     correct: "b"
     explanation: |
-      The `@` symbol references specific files in your prompts for targeted operations. For example, `Review @src/auth/login.tsx for security issues` directly loads that file. This provides precision (target exact files), speed (skip file discovery), and clarity (makes your intent explicit). Claude automatically loads the file content.
+      The `@` symbol references specific files in your prompts for targeted operations. For example, `Review @src/auth/login.tsx for security issues` signals Claude to read that file. This provides precision (target exact files), speed (skip file discovery), and clarity (makes your intent explicit). Claude reads the file on-demand via tools.
     doc_reference:
       file: "guide/ultimate-guide.md"
       section: "1.3 Essential Commands"

quiz/questions/10-reference.yaml

@@ -390,7 +390,7 @@ questions:
   - id: "10-016"
     difficulty: "senior"
     profiles: ["senior", "power"]
-    question: "What flag adds additional directories to context?"
+    question: "What flag allows Claude's tools to access directories outside the current working directory?"
     options:
       a: "--include-dir"
       b: "--add-dir"
@@ -398,15 +398,15 @@ questions:
       d: "--load-dir"
     correct: "b"
     explanation: |
-      Use `--add-dir` to add additional directories to context:
+      Use `--add-dir` to allow tool access to additional directories:
 
       ```bash
       claude --add-dir ../shared ../utils
       claude --add-dir packages/api
       ```
 
-      This is more efficient than loading the entire monorepo.
-      Multiple directories can be specified for multi-package projects.
+      By default, Claude can only access files in the current working directory.
+      Use --add-dir to extend permissions to other directories (e.g., shared libraries in a monorepo).
     doc_reference:
       file: "guide/ultimate-guide.md"
       section: "10.3 Configuration Reference"