fix(runtime): settle authority on unlisted shells and drop the SSH generation entry

The command-finished guard required a shell in SHELL_NAMES, so a user on
ksh/dash/tcsh/csh/ash/elvish/xonsh could never settle launched-agent hook
authority until the pty itself exited. Those are bare shells for every
consumer of the predicate, so widening the set is the correct scope.

The settle-generation Map also kept one entry per abnormally-exited SSH pty:
that branch preserves launch authority by design (unverifiable, not exited),
but the counter is bookkeeping for a check that can no longer land.

src/shared/shell-process-detection.ts

@@ -2,7 +2,9 @@
 // renderer (agent-ready-wait, new-workspace). A bare shell is the negative
 // signal for "is an agent running" because it garbles injected preambles.
 const SHELL_NAMES = new Set(
-  '|bash|zsh|sh|fish|cmd|cmd.exe|powershell|powershell.exe|pwsh|pwsh.exe|nu'.split('|')
+  '|bash|zsh|sh|fish|cmd|cmd.exe|powershell|powershell.exe|pwsh|pwsh.exe|nu|ksh|mksh|dash|ash|tcsh|csh|elvish|xonsh'.split(
+    '|'
+  )
 )
 const WINDOWS_PROCESS_EXTENSION_RE = /\.(?:exe|cmd|bat|ps1)$/i