[BUG] `apm install` does not deploy instructions to `.claude/rules/`

[BertenBevers]

Describe the bug
apm install deploys .instructions.md files to .github/instructions/ (Copilot) and .cursor/rules/ (Cursor), but does not deploy them to .claude/rules/ for Claude Code.

To Reproduce

1. Create a project with a .claude/ directory
2. Add a dependency that contains .apm/instructions/python.instructions.md
3. Run apm install
4. Observe that .github/instructions/python.instructions.md and .cursor/rules/python.mdc are created (if those target dirs exist), but .claude/rules/ is not created or populated

Expected behavior
apm install should deploy instruction files to .claude/rules/ as .md files (e.g., python.instructions.md → .claude/rules/python.md) when the .claude/ directory exists, consistent with how instructions are deployed to .cursor/rules/ for Cursor.

Environment (please complete the following information):

• OS: Windows 11
• Python Version: N/A
• APM Version: 0.8.9
• VSCode Version (if relevant): N/A

Logs
N/A — no error occurs; instructions are silently skipped for the Claude target.