Add --amend flag to patch command for continuing edits

[nomyfan]

Summary

Added documentation for a new --amend flag to the p12y patch command that allows users to continue editing an existing patch rather than starting from a clean workspace.

Changes

• Updated the p12y patch command signature in the CLI overview to include the optional [--amend] flag
• Added a new section in the usage guide explaining the --amend functionality:
  • Describes how --amend applies an existing patch file from patches/<package-name>+<version>.patch onto a fresh workspace
  • Documents the fallback behavior: if the patch cannot be applied cleanly, p12y uses a clean workspace and logs a warning
  • Provides a usage example showing how to invoke the command with the flag

Implementation Details

The documentation clarifies that --amend enables a workflow where users can:

1. Start with their previous changes already applied to the workspace
2. Continue making edits without losing prior work
3. Gracefully fall back to a clean state if the patch has conflicts with the package version

https://claude.ai/code/session_01N7buw5s2ZLYy4TWbarXWRe