feat(pip): verify git & https access from pip container (Fixes #216)

fleet/tasks/done/010-tmux-tally.md.muse--runtime--roles

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+# 010: Tmux tally check
+
+Goal: record multi-socket worker counts.
+
+Steps:
+1. Run `box tmux tally`.
+2. Record per-socket worker/session counts from the output.
+
+Done criteria: result notes below list each socket with its
+tallied counts, or the exact error if the command fails.
+
+Result notes (append below before moving to done/):
+
+- 2026-10-07, builder muse--runtime--roles: `box tmux tally` OK —
+  7 sessions, 10 panes, 7 active workers across 10 sockets.
+  Per-socket: default = 3 sessions (0, main, muse), 6 panes;
+  lte = 1 session (main), 1 pane; tmux-muse.sock = 3 sessions
+  (muse--runtime--operator, muse--runtime--roles, test-s), 3 panes
+  (%21, %20, %15). All panes auto-approve YES.