v1.4.4 — protocol fallback synced to CLI v1.35.0

Syncs the bundled fallback protocol (references/COOPERATION.md) to Parley Deck protocol v1.35.0:

• LE-4 completion contract (list-form checks: + driver-written ## Validation evidence + Phase-8 veto).
• §13.5 Playbooks (advisory parley learn distillation, beside consults).

Vendor-neutral skill install unchanged; both companion add-ons (parley-tracker, parley-worktrees) included.

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