chore: prepare dquic v0.6.0 release

[eareimu]

Summary

• prepare the dquic 0.6.0 release line for transport/protocol crates
• keep qmacro on 0.5.1 because its proc-macro API/code is unchanged

Validation

• cargo test -p qbase -p qmacro
• prior release-prep checks included dquic workspace tests/clippy and cargo-semver-checks for published library crates

Release notes

• release tag planned as v0.6.0
• h3-shim remains outside the approved release surface

[codecov]

Codecov Report

❌ Patch coverage is 76.04225% with 431 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
qtraversal/src/punch/puncher.rs	48.05%	200 Missing ⚠️
qinterface/src/component/local_endpoint.rs	79.94%	80 Missing ⚠️
qtraversal/src/nat/client.rs	0.00%	50 Missing ⚠️
qconnection/src/lib.rs	81.77%	37 Missing ⚠️
qconnection/src/space/data.rs	72.97%	10 Missing ⚠️
qconnection/src/path/burst.rs	83.33%	9 Missing ⚠️
qconnection/src/traversal.rs	79.06%	9 Missing ⚠️
dquic/src/client.rs	85.71%	7 Missing ⚠️
dquic/src/server.rs	86.27%	7 Missing ⚠️
qconnection/src/path/paths.rs	92.94%	6 Missing ⚠️
... and 6 more

Files with missing lines	Coverage Δ
qconnection/src/builder.rs	97.45% <100.00%> (+0.13%)	⬆️
qconnection/src/path.rs	91.14% <100.00%> (-0.10%)	⬇️
qconnection/src/space/handshake.rs	76.64% <100.00%> (-12.37%)	⬇️
qconnection/src/space/initial.rs	87.21% <100.00%> (+2.41%)	⬆️
qconnection/src/termination.rs	86.27% <100.00%> (-9.91%)	⬇️
qinterface/src/component.rs	50.00% <ø> (ø)
dquic/src/common.rs	58.62% <83.33%> (+0.97%)	⬆️
qinterface/src/manager.rs	70.36% <85.71%> (+0.19%)	⬆️
qconnection/src/state.rs	94.28% <97.14%> (+1.42%)	⬆️
qbase/src/util/wakers.rs	91.17% <93.75%> (+2.08%)	⬆️
... and 12 more

... and 17 files with indirect coverage changes

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