Introduce Mission v3 typed Polymarket task and authority identity

[proerror77]

Parent

#314

What to build

Add a versioned Mission v3 contract that makes product, task, run mode, authority profile, cohort identity, and immutable input identities explicit before dispatch. Supported tasks are settlement probability, Up-token execution, and Down-token execution. Token execution includes a typed prediction horizon. Mission v2 artifacts and checkpoints must not be silently reinterpreted as v3.

Acceptance criteria

• Mission v3 identifies BTC x 300-second product, typed task, pipeline_smoke or research_trial mode, authority profile, cohort or snapshot identity, search budget, and immutable policy identity.
• Settlement tasks cannot carry execution horizons or execution labels.
• Up and Down execution tasks bind their semantic side and one explicit 5, 10, 15, or 30-second prediction horizon.
• Admission rejects task, capability, authority, snapshot, and policy mismatches before execution.
• Mission identity changes when any decision-relevant field changes.
• Mission v2 and old checkpoints are either handled by their existing versioned path or rejected; no implicit v2-to-v3 mapping or resume exists.
• Counterexamples cover side mismatch, unsupported horizon, baseline authority requesting CEX-only features, mutable snapshot identity, and checkpoint version drift.

Blocked by

#315

Out of scope

Evaluator calculations, cohort partition implementation, collector or catalog changes, Job rendering, Paper, Shadow, Live, and promotion.