feat(canvas): add rApplet circuit components + template system
Unified applet abstraction for canvas — compact dashboard cards with typed
I/O ports, expandable circuit editors, and save-able reusable templates.
New files: shared/applet-types.ts, lib/folk-applet.ts, lib/applet-circuit-canvas.ts,
lib/applet-template-manager.ts, lib/applet-defs.ts, plus applets for rGov (Signoff Gate,
Governance Circuit), rFlows (Flow Summary), rWallet (Balance Card, Token Balance).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Jeff Emmett
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