fix(hotel_receptionist): give card capture a no-usable-card exit

[u9g]

Summary

A caller whose only card is expired had no way out of GetCardTask. The expired-date ToolError told the agent to ask for another card, and decline_card_capture was documented as refusal-only, so the agent kept re-asking a caller who had already said they had nothing else to give.

Three changes route that dead end to the existing exit, kept to what the sub-task can actually observe:

• task instructions: if the caller refuses, or has no other card after theirs came back expired, don't keep asking - call decline_card_capture with the reason
• the expired-date ToolError first asks to confirm the date (a past date in voice is usually a misheard year), and names decline_card_capture only if the card really is expired and there's no other card
• decline_card_capture's docstring widens from "the caller explicitly refuses" to also cover the expired-with-no-other-card case

The sub-task does not speak any reassurance about the booking: it is also opened for a new booking that isn't written yet, so "the booking stays held" would be false there. The caller-facing script for the card-update path stays where it already lives, in the receptionist's instructions.

Follow-up: #7177 (stacked) gives BookRoomTask a directive when the capture ends without a card, so the loop doesn't move up a level.

Cherry-picked from #6567 (2a51757), get_card.py only, then narrowed as above.

Testing

• pytest examples/hotel_receptionist/ tests/test_tools.py --allow-uncategorized (114 passed)
• ruff format --check and ruff check clean
• Scenario 15 ("Caller pushing about a declined card") simulated with this change plus fix(hotel_receptionist): give the room-booking flow an exit when no card is taken #7177: passed. It reaches GetCardTask through start_card_update and the new wording did not misfire on "I don't have another card on me right now".

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[u9g]

Pushed a second commit narrowing the wording after review: dropped "the booking stays held" (false on the new-booking path, where nothing is written until confirm_booking) and "keeps failing / won't validate" (the sub-task never authorizes a charge), and the expired-date error now asks to confirm the date before offering the exit. PR body updated. The BookRoom side of the loop is in #7177, stacked on this.