chore: add diagnostic logging around workspace git clone

The workspace creation endpoint returns 500 but the actual error is not
visible. Add explicit error logging when GitService.clone fails and info
logging when git creates a directory name different from the one derived
from the remote URL.

Quality gates:
- pytest tests/unit: 219 passed
- mypy: clean on changed files

apps/api/src/services/shared/.pi-map.index.md

@@ -2,12 +2,14 @@
 dir: apps/api/src/services/shared
 
 ## role
-Provides common infrastructure and utility services used across the API backend, including cross-cutting concerns like request tracing, file operations, notifications, Docker container management, and workspace lifecycle handling.
+Provides common infrastructure services used across the API backend, including security, I/O, container operations, and workspace lifecycle management.
 ## parent
 index: apps/api/src/services/.pi-map.index.md
 map: apps/api/src/services/.pi-map.md
 ## children
--
+- apps/api/src/services/shared/.ruff_cache
+  index: apps/api/src/services/shared/.ruff_cache/.pi-map.index.md
+  map: apps/api/src/services/shared/.ruff_cache/.pi-map.md
 ## files
 - __init__.py
 - correlation.py
@@ -24,5 +26,7 @@ map: apps/api/src/services/shared/.pi-map.md
 ## workflows
 - change shared behavior
   read: __init__.py, correlation.py, file_service.py
+- explore shared subdirectories
+  index: apps/api/src/services/shared/.ruff_cache/.pi-map.index.md
 ## dirty
 -