Add comprehensive bash script tests and fix old mcp/ path references

- Created tests/test_setup_scripts.py with 19 tests covering:
  * setup_mcp.sh validation (11 tests)
  * General bash script quality (4 tests)
  * MCP path consistency across codebase (4 tests)

- Fixed old 'mcp/' references in documentation:
  * docs/B1_COMPLETE_SUMMARY.md (3 refs)
  * docs/PDF_MCP_TOOL.md (2 refs)
  * docs/MCP_SETUP.md (18 refs)
  * docs/TEST_MCP_IN_CLAUDE_CODE.md (4 refs)

These tests would have caught Issue #157 before it reached users.

Tests verify:
- Bash syntax validity
- No hardcoded paths
- Correct skill_seeker_mcp/ directory references
- Files referenced in scripts actually exist
- No deprecated backticks
- Proper error handling (set -e)

All 19 tests passing ✅

docs/PDF_MCP_TOOL.md

@@ -165,7 +165,7 @@ Returns `TextContent` with:
 
 ### MCP Server Changes
 
-**Location:** `mcp/server.py`
+**Location:** `skill_seeker_mcp/server.py`
 
 **Changes:**
 1. Added `scrape_pdf` to `list_tools()` (lines 220-249)
@@ -304,7 +304,7 @@ Error: json.decoder.JSONDecodeError: Expecting value: line 1 column 1
 
 ```bash
 # 1. Start MCP server
-python3 mcp/server.py
+python3 skill_seeker_mcp/server.py
 
 # 2. Test with MCP client or via Claude Code