fix(tmux): isolate sessions on a dedicated socket + raise pane nofile limit (fixes new-session crash after tmux upgrade) (#96)

* fix: isolate codeman tmux sessions

* fix(tmux): unify all sessions onto a single dedicated socket

Remove the per-session `tmuxSocket` field that recorded which tmux server
each session lived on (default vs the `codeman` socket). That field was a
persisted cache of physical reality and could drift — causing live sessions
to be wrongly marked dead ("tab shows no session found") and spawning
duplicate "Restored:" tabs.

All Codeman sessions now live on one process-wide socket (`tmux -L codeman`,
overridable via CODEMAN_TMUX_SOCKET), exposed via TmuxManager.muxSocket on
the TerminalMultiplexer interface. reconcileSessions() collapses from a
multi-socket scan (locate / re-pin / cross-socket dedup) to a single
`list-panes` query. loadSessions() strips the obsolete field from on-disk
records so it stops being written back.

Also fix two sibling bare-`tmux` call sites the unification would otherwise
leave broken (same #80 regression class — bare tmux hits the user's default
server and never finds a session on the codeman socket):
- session.ts queryTmuxWindowSize(): add `-L <socket>` (was silently falling
  back to 120x40 on re-attach, losing scrollback)
- session-routes.ts send-key (Shift+Enter / Ctrl+Enter newline): route
  through ctx.mux.muxSocket

SSH chooser scripts (tmux-manager.sh, tmux-chooser.sh) route every tmux call
through `tmux -L $CODEMAN_TMUX_SOCKET`, matching the TS default.

---------

Co-authored-by: Teigen <teigen@TeigendeMac-mini.local>

scripts/tmux-chooser.sh

@@ -32,6 +32,13 @@ set -e
 CODEMAN_STATE="$HOME/.codeman/state.json"
 CODEMAN_SESSIONS="$HOME/.codeman/mux-sessions.json"
 
+# Dedicated tmux socket all Codeman sessions live on. MUST match
+# DEFAULT_CODEMAN_TMUX_SOCKET / CODEMAN_TMUX_SOCKET in src/tmux-manager.ts —
+# otherwise list-sessions would enumerate the user's default tmux server
+# (missing the real Codeman sessions, surfacing unrelated ones).
+CODEMAN_TMUX_SOCKET="${CODEMAN_TMUX_SOCKET:-codeman}"
+TMUX_CMD=(tmux -L "$CODEMAN_TMUX_SOCKET")
+
 
 # iPhone 17 Pro portrait width (conservative)
 MAX_WIDTH=44
@@ -286,7 +293,7 @@ parse_sessions() {
 
         # Get PID from tmux
         local pid
-        pid=$(tmux display-message -t "$session_name" -p '#{pane_pid}' 2>/dev/null || echo "0")
+        pid=$("${TMUX_CMD[@]}" display-message -t "$session_name" -p '#{pane_pid}' 2>/dev/null || echo "0")
 
         SESSION_PIDS+=("$pid")
         MUX_NAMES+=("$session_name")
@@ -314,7 +321,7 @@ parse_sessions() {
         fi
 
         i=$((i + 1))
-    done < <(tmux list-sessions 2>/dev/null || true)
+    done < <("${TMUX_CMD[@]}" list-sessions 2>/dev/null || true)
 }
 
 # ============================================================================
@@ -462,7 +469,7 @@ attach_session() {
     echo -e "${D}(Ctrl+B D to detach)${R}"
     sleep 0.3
 
-    tmux attach-session -t "$mux_name"
+    "${TMUX_CMD[@]}" attach-session -t "$mux_name"
 
     return 0
 }