Replace hardcoded /opt/hermes check with dynamic install-tree detection
using Path(__file__).resolve().parent. This catches ALL install paths
(Docker /opt/hermes, apt /usr/local/lib/hermes-agent, git clone, custom)
instead of just the Docker image path. Also covers subdirectories of the
install tree, not just the top-level dir.
Add regression test test_install_tree_skipped to verify both the install
root and subdirectories are excluded from chmod.
Add contributor email mapping for bradmarshall987.
Follow-up to PR #93050 by @bradmarshall987.
kshitijk4poor