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feat(errutil): add ErrNilErrorFunc, make JoinFnError panic-free, and harden Trace metadata

- Add ErrNilErrorFunc and join it into *err when fn is nil, and make JoinFnError a no-op when the target pointer is nil, so defer/cleanup paths never panic; callers can errors.Is the nil-func case.
- Stop re-wrapping the primary error when fn returns nil: JoinFnError now leaves *err untouched (same concrete type) instead of wrapping it in a single-element joinError.
- Harden Trace: fall back to the function name "unknown" when runtime caller metadata is unavailable, and simplify the caller lookup.
- Document JoinFnError's defer/named-return usage and the silent-discard footgun, and note that Trace's file path is compiler-recorded and -trimpath dependent.
- Add nil-func, nil-pointer, and no-rewrap tests, an output-verified defer example, and Trace/JoinFnError benchmarks. Coverage stays at 100%.

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