DETERMINISTIC BLACKJACK — PLATE PUBLICATION WORKFLOW V4

New publication control:
- Startup reminder tells the operator to provide ChatGPT output.txt plus the latest plate
  and request creation of the latest session plate.
- Each newly saved live session appends:
    PLATE_STATUS | session <id> | PENDING
- Before another LIVE session begins, the latest LEDGER_ENTRY session is checked.
- If that session's latest PLATE_STATUS is not COMPLETE, the program asks:
    Has the session plate for <id> been created and checked? [Y/N]
- Y appends:
    PLATE_STATUS | session <id> | COMPLETE | operator_confirmation <timestamp>
- N blocks continuation unless the operator explicitly chooses to defer.
- Explicit deferral appends:
    PLATE_STATUS | session <id> | DEFERRED_BY_OPERATOR | operator_confirmation <timestamp>
- Completing S prints the publication-next-step reminder.

Compatibility:
- Existing output.txt files without PLATE_STATUS are supported.
- The latest LEDGER_ENTRY is treated as needing operator confirmation before the next live session.
- Historical evidence is never rewritten.

Rationale:
This keeps the live-session -> shuffle-analysis -> plate-publication chain visible and auditable,
so an operator does not silently accumulate experiments without producing the corresponding plate.