chore: add explicit error types for actors

[NathanFlurry]

Fixes ACTR-6

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ACTR-6 Clean up actor error handling

[NathanFlurry]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• chore(actors-sdk): convert this._connections to map #1612
• chore: add max message size #1611
• chore: add support for multiple protocols #1610
• chore: shorten protocol keys #1609
• chore: add zod for ws protocol #1608
• chore: finalize query syntax for manager #1607
• chore: add explicit error types for actors #1606 👈 (View in Graphite)
• chore: throttle save state #1604
• chore: rename protected properties to _* #1603
• chore: expose logging to actors #1602
• chore: move actor sdk logging to @std/log #1601
• chore: fix actor sdk biome lints #1600
• main

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Merge activity

• Dec 12, 5:06 AM EST: A user added this pull request to the Graphite merge queue.
• Dec 12, 5:08 AM EST: CI is running for this PR on a draft PR: #1613
• Dec 12, 5:12 AM EST: A user merged this pull request with the Graphite merge queue via draft PR: #1613.