v0.28.0

What's Changed

• fix(windows): avoid encoded PowerShell updater by @elkaix in #36
• feat(shell): welcome banner redesign + TUI polish, update orchestrator, release-orchestration plans by @elkaix in #37
• ci: dispatch App migration + retire dead docs step + installer hardening by @elkaix in #38
• ci(actions): update workflows for Node 24 by @elkaix in #39
• feat(release): release.py + version lockstep SSOT (P1) by @elkaix in #40
• feat(release): add P2 distribution channels by @elkaix in #41
• chore(release): prepare 0.28.0 by @elkaix in #42
• chore(release): prepare 0.28.0 by @elkaix in #43
• docs: remove dead Zsh plugin integration by @elkaix in #44
• docs(changelog): fold pending notes into 0.28.0 + document migration by @elkaix in #45
• fix(ci): restore version-tag trigger glob in release workflows by @elkaix in #46

Full Changelog: v0.27.0...v0.28.0