chore: prepare dquic v0.7.0-beta.3

[eareimu]

Summary

Prepare the dquic transport release for tag v0.7.0-beta.3 after the remote main change that makes netwatcher opt-in.

Published crates

• qinterface 0.7.0-beta.1
• qtraversal 0.7.0-beta.3
• qconnection 0.7.0-beta.2
• dquic 0.7.0-beta.3

Unchanged workspace crates keep their existing versions. h3-shim remains outside the release surface.

Version rationale

• qinterface moves from 0.6.0 to the 0.7.0 prerelease line because disabling the new netwatcher feature removes the previously unconditional Devices::restart_watcher API. cargo-semver-checks confirms this is a major compatibility change for a 0.x crate.
• qtraversal, qconnection, and dquic receive prerelease patch increments so their published dependency graph resolves the new qinterface line without duplicate incompatible versions.

Verification

• git diff --check
• cargo +nightly fmt --all -- --check
• cargo +nightly clippy --all-targets --all-features -- -Dwarnings
• cargo test --workspace --all-features --all-targets -- --test-threads=1
• RUSTDOCFLAGS="-D warnings" cargo +nightly doc --no-deps
• cargo +1.88.0 build --workspace --release
• cargo publish --dry-run --locked --allow-dirty -p qinterface -p qtraversal -p qconnection -p dquic
• cargo +1.92.0 semver-checks check-release against the latest published version of each changed crate; the three prerelease patch surfaces pass, and the qinterface probe reports the expected removal that requires the 0.7 line.

Proposed annotated tag message

# dquic v0.7.0-beta.3

## Changes

- Make interface watching opt-in through the `netwatcher` feature across `qinterface`, `qconnection`, and `dquic`.
- Move `qinterface` to the `0.7.0` prerelease compatibility line because its default public API no longer exposes watcher-only methods.
- Keep the published transport dependency graph on one compatible `qinterface` version.

## Published crates

- `qinterface` v0.7.0-beta.1
- `qtraversal` v0.7.0-beta.3
- `qconnection` v0.7.0-beta.2
- `dquic` v0.7.0-beta.3

Unchanged workspace crates remain on their existing published versions. `h3-shim` remains outside the dquic release surface.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 9 files with indirect coverage changes

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