Release v1.0.2: fix WASI no-default build, MSRV CI, repo rename

[al8n]

Summary

• P2 WASI --no-default-features build: the stats API and feature re-exports now gate on cfg(any(unix, windows)) so wasm32-wasip1 compiles (rustix does not expose statvfs/flock/fallocate there); on WASI the crate reduces to FsStats + TryLockError.
• P2 async-feature MSRV drift in CI: minrust now runs cargo hack check --each-feature at 1.75.0 (skipping async-std/smol, which documented MSRV is higher), and a new minrust-async job pins 1.85.0 to catch future drift in async-std/smol transitive deps.
• P3 AsFd / AsHandle cleanup (declined): async_std::fs::File, smol::fs::File, and both fs_err{2,3}::tokio::File wrappers only expose AsRawFd/AsRawHandle upstream. Splitting the macros into safe/raw variants would be churn without soundness benefit (reviewer already noted the existing lifetimes are fine). Added explanatory comments in src/unix.rs, src/unix/{sync,async}_impl.rs, and src/windows.rs so this isn't re-opened.
• Crate-level allow(unused_macros) so cargo clippy --no-default-features no longer errors on the feature-gated cfg_*! macros.
• Repo rename: github.com/al8n/fs4-rs → github.com/al8n/fs4 (Cargo.toml repository, README badges/links).
• Bump version to 1.0.2.

Test plan

• cargo test --all-features -- --test-threads 1 (90 passed)
• cargo clippy --all-features -- -Dwarnings
• cargo clippy --no-default-features -- -Dwarnings (reproduced reported failure, now green)
• cargo clippy --no-default-features --features <each> for sync / async-std / tokio / smol / fs-err2 / fs-err3 / fs-err2-tokio / fs-err3-tokio
• cargo check --target wasm32-wasip1 --no-default-features (previously failed to compile)
• cargo check --target wasm32-wasip1 --no-default-features --features sync | fs-err2 | fs-err3
• cargo fmt --all -- --check
• CI: verify new minrust (1.75.0, cargo-hack --skip async-std,smol) and minrust-async (1.85.0) jobs both pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.27%. Comparing base (f5e148e) to head (ed3212b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files          11       11           
  Lines         753      755    +2     
=======================================
+ Hits          740      742    +2     
  Misses         13       13           

Files with missing lines	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/unix.rs	100.00% <ø> (ø)
src/unix/async_impl.rs	100.00% <ø> (ø)
src/unix/sync_impl.rs	100.00% <ø> (ø)
src/windows.rs	90.90% <ø> (ø)

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[Copilot]

Pull request overview

This PR refines platform/MSRV handling for fs4 by (1) clarifying and centralizing the rationale for raw-handle/raw-fd usage at FFI boundaries, (2) tightening cfg gating so non-Unix/Windows targets can compile without the OS-backed extension APIs, and (3) strengthening CI’s MSRV coverage across feature flags.

Changes:

• Document and standardize the “single code path via AsRaw* + Borrowed*::borrow_raw” approach for supported file wrapper types.
• Gate file_ext + filesystem stat APIs to cfg(any(unix, windows)) so unsupported targets build without those backends.
• Update CI MSRV checking to validate feature-gated code paths via cargo hack, with a separate MSRV track for async-std/smol.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/windows.rs	Adds rationale for using AsRawHandle at the FFI boundary to support multiple file wrapper types.
src/unix.rs	Documents why BorrowedFd::borrow_raw is used to keep one implementation across file types.
src/unix/sync_impl.rs	Adds cross-reference comment explaining BorrowedFd::borrow_raw choice in allocation path.
src/unix/async_impl.rs	Adds cross-reference comment explaining BorrowedFd::borrow_raw choice in allocation path.
src/lib.rs	Gates backend-dependent modules/APIs to Unix/Windows so non-backend targets can still compile.
.github/workflows/ci.yml	Expands MSRV checks to --each-feature and adds a separate MSRV job for async runtimes.

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