Maintain incremental control-state projections from durable history

[Brad-Edwards]

Control-history appends and effect processing repeatedly scan accumulated history, producing quadratic cumulative work as a run grows.

Acceptance criteria

• Maintain the state needed for crossing admission, provider causal state, and pending-effect processing incrementally under the revised commit and occurrence contracts.
• Keep immutable history authoritative. Define projection versioning, invalidation, reconstruction, and crash consistency without changing historical meanings.
• Verify incremental state against a complete fold across accepted, refused, duplicate, and recovered operations, including incomplete commits.
• Demonstrate that steady-state append/dispatch work no longer scales with unrelated accumulated history. Bound performance claims to the measured workload and disclosed active-state size.

Prerequisites: #1369.

References: Diagnosis.