umputun / agterm / 29673744980

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feat: hold a command session open after its command exits (#255)

* feat: hold a command session open after its command exits

session new --command --wait keeps the session on libghostty's press-any-key
prompt after the command exits, with the final output intact, instead of
closing right away. It is the session-surface counterpart of overlay open
--wait, opt-in and default unchanged.

the wait flag persists (SessionSnapshot.commandWait), so a restored command
session that re-runs its command holds again instead of diverging from a fresh
one across restart. It reads back on tree's commandWait, and --wait without
--command is rejected server-side.

no new control command (a flag on session.new, like --follow), so the catalog
stays at 61.

Fix #254

* fix(review-loop): final cleanup pass, addressed 4 findings

- [minor] [AppStore+Panes.swift] clear commandWait alongside initialCommand on split
  promotion, so a promoted survivor's snapshot can't persist commandWait:true with no
  initialCommand (both live readers gate on initialCommand, so no behavior change)
- [test-gap] [AppStorePaneTests] set commandWait=true in the plain-shell tree case so the
  initialCommand!=nil read-back gate is actually exercised (kills the drop-the-guard mutant)
- [test-gap] [SnapshotRoundTripTests] add a round-trip test for the false->nil write and the
  nil->false restore mapping (kills the ?? true mutant)
- [doc-gap] [site/commands.html] add commandWait to the tree Session-node field enumeration

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