epic(ux): Command Palette & Quick Switcher (Epic B / CP-01…05) #742

Goal

Keyboard-first navigation (Obsidian / VS Code): one command registry, Ctrl/Cmd+P palette, object Quick Switcher, wire existing actions, then extension contributions.

Template: docs/ui-parity-and-command-palette-issues.md Epic B. Workspace chrome (Epic A UI-01…04) is shipped; UI-05 #740 is a sibling, not a blocker.

Children

• #743 — CP-01 QueryaCommandRegistry
• #744 — CP-02 Palette UI (Ctrl/Cmd+P)
• #747 — CP-03 Quick Switcher (Ctrl/Cmd+K)
• #745 — CP-04 Bridge menus / SQL / grid / connections
• #746 — CP-05 Extension manifest contributes.commands

Non-goals

• Replacing the connections tree
• Marketplace storefront (0.5.0) beyond command contribution API

Acceptance (epic)

• Palette opens from any workspace and runs a core command
• Fuzzy filter + arrows + Enter / Esc
• Quick Switcher opens a table/collection without walking the tree
• isEnabled matches current workspace
• Disabled extension commands leave the registry