445#458
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Closes #445
Boxed error round-trip, anyhow parity (
from_boxed1.0.95,into_boxed_dyn_error1.0.98):AppError::from_boxed(kind, box)— wraps an already-boxeddyn Error + Send + Syncwithout re-boxing (stored as owned source, sodowncast/downcast_ref/downcast_mutwork on it)AppError::into_boxed_dyn_error(self)— boxes the error preserving kind, Display, metadata and the full source chain; always boxes self rather than unwrapping the source (no silent loss of kind/message/metadata), documented rationaleFrom<Box<dyn Error + Send + Sync>> for AppError(→ Internal) — checked against existing From impls, no conflicts; alloc-only, works under no_stdRound-trip verified: restored → original AppError → root cause chain intact; inner AppError recoverable by value. 5 new tests + 4 doctests; full suite, no_std build, clippy zero warnings, nightly fmt, readme_sync — all green.