v0.2.0 — Adaptive terminal theme

What's new

• Adaptive terminal theme: the terminal follows the DSH GUI light/dark appearance (falling back to OS prefers-color-scheme when the theme service is absent); open sessions hot-swap in place
• Toolbar cycle button: pin 跟随界面 / 深色 / 浅色 (auto / dark / light) per browser via localStorage
• WCAG contrast floors enforced by scripts/check-contrast.mjs in npm test: foreground/background ≥ 7:1, ANSI colors ≥ 4.5:1, for both palettes
• Shared palette module as the single source of truth for the client bundle and the contrast checker
• ADR 0002 records the reversal of the original always-dark decision

Closes #7 #8 #9 #10 (spec #6).

v0.1.0

Initial release: multi-server SSH terminal panel for DSH Web GUI.

• Bottom terminal panel, Ctrl+` toggle, multi-tab
• Password / private key / SSH agent / no-auth
• Connection test, drag-resize, localStorage persistence
• Integration tests against a real sshd