* fix: pause auto-mode instead of blocking when env variables needed (#1146)
When gsd auto encounters pending secrets in the SECRETS.md manifest,
it now pauses the session with a clear notification listing the missing
keys, instead of blocking the entire auto loop with an interactive TUI
prompt. On resume (/gsd auto), secrets are re-collected via the TUI —
if all are skipped, the session re-pauses to prevent broken task runs.
* feat: notify remote channels (Slack/Discord/Telegram) on secrets pause
Sends a one-way notification to the configured remote channel when
auto-mode pauses for missing env variables. The notification directs
the user back to the terminal — secrets are never collected through
remote channels for security reasons.
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