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feat(game): encode rondel yields alongside positions (#1709)

Adds a second 9-slot section to the shared block of the feature
vector: for each rondel token, the resource amount it would currently
yield if taken (computed via the existing take() function in
board/rondel.ts), normalized by the max possible yield of 10. Tokens
not yet on the rondel encode as 0.

The model previously got the token positions as deltas mod 13 — useful
for "where is each token" but not directly the play-relevant signal.
Yield is the value the player would actually receive on take, so
exposing it lets the heuristic head learn rondel decisions without
re-deriving the arm-value table.

FEATURE_LEN grows by 9. featureSpec.vocab.rondelKeys still describes
both sections; consumers can index them as
  deltas: shared
  yields: shared + rondelKeys.length

https://claude.ai/code/session_012g8vWmxD3NfWGedLs6YqpK

Co-authored-by: Claude <noreply@anthropic.com>

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