docs(changelog): add the voice alias hint entry

Co-Authored-By: Claude Opus 5.5 <[email protected]>

changelog.d/1462-voice-alias-hint-budget.md

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+- Leave layer aliases the layer id already spells, such as "dams" for
+  `local-dams`, out of the voice layer hint. The Realtime prompt drops from
+  52,000 to 51,695 characters, leaving room under the 52,000 gate for new
+  voice-toggleable layers; every alias is still accepted (quanticsoul4772,
+  #1462).