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Fix flaky/hanging note-c card.binary HIL tests (#253)

The nightly HIL job kept failing, and recently hung for hours. Fixes:

- Use the current notestation-client (v3.5.1) via the
  install_notestation_client action, replacing the old v2.2.0 client. The old
  one briefly flickered the Swan's USB test port while the board rebooted after
  flashing, so the tests couldn't open it and none ran.

- Wait for the board's prompt and send the "start" command a few times. The
  board can miss a single "start" sent while its USB is still settling (~2s),
  which left the run hung with no output.

- Add a concurrency group so a new push cancels the previous run instead of two
  runs fighting over the single test station.

- Cap the job at 30 minutes so a stall fails fast.

- Drop the "Install notecard CLI" and socat steps; the current client no longer
  needs them (a plain cat streams the Notecard trace).

Verified on barcelona-notestation-1.

Authored by Claude Code (AI agent).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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