pub fn derive_clone_id(exe_dir: &Path) -> Option<String>Expand description
Walk up from exe_dir looking for a workspace-root marker, then
hash that absolute (canonical) path with FNV-1a and return a 16-char
hex string. Used as the per-clone discriminator in
~/.agentmux/dev/<branch>/<clone_id>/. Returns None if no marker
is found (extreme edge case — task dev always runs from inside a
clone with .git/Cargo.toml/Taskfile.yml).
Recognized markers (any one suffices, in priority order):
.git (dir or file — supports git worktrees), Cargo.toml,
Taskfile.yml. We prefer .git because it identifies the literal
clone, but Cargo.toml is a safe fallback (the workspace root has
a [workspace] Cargo.toml).