FW-07: _resolve_real_tmux_path and _init_tmux_isolation now use
_TMUX_SHIM_DIR_PATTERN and _TMUX_SKILLS_BIN_PATTERN env-overridable
constants instead of hardcoded path strings. All 4 reference sites
updated (lines 32, 37, 57, 76). Default values preserve original
slash semantics (/multi-agent-tmux-shim/, /skills/.bin).
FW-08: _delegate_py_bin caches result in AGENT_PYTHON_BIN shell
variable (not exported — avoids cross-workspace pollution).
Fallback uses command -v python3 for absolute path caching.
Reviewed by agy-existing (FAIL->fixed) and claude-existing (FAIL->fixed).
Both reviewers identified: slash omission, incomplete extraction at :57/:76,
export side effects. All issues resolved.
Godopu
4cea11438a