docs: add API redesign plan for v0.5#147

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ElFantasma wants to merge 4 commits intomainfrom

feat/critical-api-issues

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
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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
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