fix(wrap): prepend rtk bin dir to PATH for wrapped tools

[ketpatil77]

Description

Make wrapped tools able to resolve Headroom-managed rtk without requiring users to manually add ~/.headroom/bin to PATH.

headroom wrap now prepends the managed rtk bin directory to the child process PATH before launching the tool.

Changes Made

• headroom/cli/wrap.py: added _prepend_rtk_bin_to_path() and call it before launching wrapped tools
• tests/test_cli/test_wrap_helpers.py: regression test for PATH prepending

Testing

• pytest tests/test_cli/test_wrap_helpers.py -k "prepend_rtk_bin_to_path_injects_managed_bin_dir"
• ruff check headroom/cli/wrap.py tests/test_cli/test_wrap_helpers.py

Impact

Bare rtk ... rewrite output now works inside wrapped shells.

[github-actions]

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