dshell v0.4.0

DShell core release for the DHTTP 0.4.0 release wave.

Changes

• Bump the published dshell package to 0.4.0.
• Move the DShell core dependency line to published h3x 0.4.0 with WebTransport/RPC support.
• Keep server-only test helpers feature-gated so all-target/all-feature checks stay clean across feature sets.

Release role

• Follows h3x 0.4.0 and dyns 0.4.0 publication.
• Unblocks downstream gmutils and gateway release validation that consumes DShell over WebTransport.

Verification

• cargo metadata --no-deps --format-version 1
• cargo fmt --check
• cargo publish --dry-run --allow-dirty
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-features
• cargo build --no-default-features --features pam
• dssh PR #3 final CI passed.

Authentication and provenance

• Release tag: v0.4.0
• Annotated tag object: c9ff7c9efdd03e86103ae28e3d55a9d9bd45e8bf
• Target commit: 48d952b650d6abbeea0be64860ef81b88514b888
• Published crate: dshell 0.4.0
• crates.io Trusted Publishing: GitHub repository genmeta/dssh, run 27645725314, commit 48d952b650d6abbeea0be64860ef81b88514b888
• GitHub Release created with an authenticated GitHub CLI session and --verify-tag.