chore: sync v4.1-dev with v4.0-dev (bring in the 4.0.0 release)

[shumkov]

Mechanical catch-up so v4.1-dev continues from the released 4.0.0 line before ongoing PRs are retargeted onto it.

Brings in 3 already-merged/reviewed commits:

• chore(release): update changelog and bump version to 4.0.0 #3975 chore(release): bump to 4.0.0
• chore: retarget in-repo branch references from v3.1-dev to v4.0-dev #3972 retarget branch references v3.1-dev → v4.0-dev
• build: update rust-dashcore to v0.44.0 #3973 build: rust-dashcore v0.44.0

No new changes; v4.1-dev is a strict ancestor of v4.0-dev (0 ahead, 3 behind). Merge with a merge commit (not squash/rebase) to preserve the commit identities.

[coderabbitai]

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[github-actions]

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Updated at 2026-07-02T07:43:56.427Z

[thepastaclaw]

✅ Review complete (commit 9f9092c)

[thepastaclaw]

Code Review

Verified the worktree is at 9f9092c and PR #3978 is scoped as a mechanical sync of v4.1-dev with the v4.0.0 release line. No reviewer or CodeRabbit payload contains any concrete in-scope finding to validate or carry forward.