bug(windows): amplifier update fails with [WinError 5] Access is denied on module cache directories

[hoopsomuah]

Description

amplifier update fails on Windows when clearing cached module directories. Every module cache entry fails to clear, and all bundle updates subsequently fail. Occurs on both normal updates and --force updates.

Error Output

Could not clear ...amplifier-module-context-simple-...: [WinError 5] Access is denied:
'...\.git\objects\pack\pack-....idx'
Could not clear ...amplifier-module-hooks-logging-...: [WinError 5] Access is denied: ...
... (repeats for all modules)

⚠ Update completed with errors
  ✗ Bundle: amplifier: [WinError 5] Access is denied: ...
  ✗ Bundle: browser-tester: [WinError 5] Access is denied: ...
  (all bundles fail)

Root Cause

Git pack files (.git/objects/pack/*.idx, .pack) are created read-only on Windows. Python's shutil.rmtree() does not handle read-only files on Windows.

Affected components:

• amplifier-app-cli: cache_management.py, module_cache.py, reset.py, sources_compat.py
• amplifier-foundation: sources/git.py (bundle cache clearing)

Fix

• microsoft/amplifier-app-cli#152
• microsoft/amplifier-foundation#137