feat: implement Handler<M> API with envelope-based mailbox#148

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ElFantasma wants to merge 6 commits intomainfrom

feat/handler-api-v0.5

Commits on Feb 4, 2026

docs: add API redesign plan for v0.5
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Commits on Feb 5, 2026

fix: use Receiver trait with Recipient alias for consistent naming
ElFantasma
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docs: use Actix-style object-safe Receiver trait in API plan
ElFantasma
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Commits on Feb 6, 2026

docs: address PR review comments on Supervisable and Handler traits
ElFantasma
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Commits on Feb 9, 2026

feat: implement Handler<M> API with envelope-based mailbox (#144, #145)
ElFantasma
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Commits on Feb 10, 2026

feat: add chat_room example demonstrating Recipient<M> circular dependency solution
ElFantasma
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