fix(validator): align event watcher busy state with reservations and TTL

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Summary

Closes ##326

Aligns ContractEventWatcher busy tracking with on-chain reservations as well as swaps: MinerReserved / ReservationCancelled, bootstrap from get_miner_reserved_until when there is no active swap row, and a synthetic busy -1 at reserved_until + 1 because the contract clears expired reservations lazily with no event.

Crown-time replay now treats a reserved miner (including reservation-only episodes with no SwapInitiated) as busy through the correct block range, so crown credit flows to the next eligible miner until the reservation lapses or is cancelled.

Changes

• allways/validator/event_watcher.py
  • Handle MinerReserved, ReservationCancelled, and SwapInitiated transitions so reservation busy and swap busy do not double-count.
  • Bootstrap busy state from active reservations (TTL from contract or RESERVATION_TTL_BLOCKS), with bootstrapped_reserved_miners so replay does not apply a second +1.
  • _apply_reservation_expiry_synthetics during sync_to to emit the missing busy -1 at reservation expiry.
  • Extend reserved_until on TimeoutExtensionFinalized when the miner is in reservation-only busy state.
• tests/test_event_watcher.py: unit tests for reservation busy, cancel, swap handoff, and bootstrap replay.
• tests/test_scoring_v1.py: integration-style crown replay test where the best-rate miner is reserved without a swap and the runner-up receives crown share until expiry.

How to test

uv sync
uv run pytest tests/test_event_watcher.py tests/test_scoring_v1.py -q

(Full suite: uv run pytest tests/)

Checklist

• Branch is up to date with target base
• Tests pass (uv run pytest tests/)
• Lint clean where touched (uv run ruff check allways/ neurons/)

Related

• Fixes busy / crown behavior around miner reservations and TTL (issue Reservations don't mark a miner busy in crown-time scoring #326 if that is the tracking ticket).