Colours for shapes and pen strokes (FL-92)

[raj-khan]

Starts M12, Draw by hand, cleanly: adds FL-92 to FL-94 to the backlog and ships FL-92.

• A named palette (red, orange, yellow, green, teal, blue, violet, pink, grey) from Open Color, with light and dark values. A coloured shape strokes in the colour and fills with its tint.
• Selecting shapes shows swatches; one pick colours them all in one undoable change, and Default clears it.
• The pen has its own colour, remembered in the browser.
• .flow writes and reads id color: red; an unknown colour names the choices. Colours are names, so an agent can use them to mean something.
• SVG and PNG export, and Excalidraw import and export (nearest named colour), carry them. The README, the format page, llms-full, the plugin skill and the draft prompt teach the line.

Tests: 320 unit, 148 e2e, all passing. Includes the rebuilt plugin bundle.

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