Build color swatch and color showcase fixtures (litmus-c55s)


Status	Done · `archived`
Type	Task
Priority	normal
Parent	Fixtures iteration — more realistic, better color showcase (litmus-49jz)

Create two special-purpose fixtures:

color-swatch/ — raw reference palette:

Small Rust or shell program
Prints all 16 ANSI colors (0-15) as labeled foreground text + background blocks
256-color palette grid (6x6x6 cube + 24 grayscale)
A few truecolor gradients (red→green, dark→light, hue wheel)
Must fit 80x24

color-showcase/ — themed palette in context:

Looks like a real scenario (e.g. status dashboard, CI pipeline summary)
Naturally exercises all 16 ANSI colors including brights
Uses background colors for status bars/highlights
Deterministic output

Plan

color-swatch fixture

A shell script that prints a reference palette:

16 ANSI colors as labeled foreground text and background blocks
256-color palette grid (6×6×6 cube sampling + grayscale)
A few truecolor gradient samples
setup.sh is empty (no state needed), command.sh does all output

color-showcase fixture

A simulated CI/deploy dashboard that naturally uses all 16 ANSI colors:

Build status lines (green pass, red fail, yellow warning)
Deploy pipeline stages
Service health checks
Deterministic, self-contained printf/echo output

Todo

Create color-swatch fixture (setup.sh + command.sh)
Create color-showcase fixture (setup.sh + command.sh)
Test both fixtures locally
Update README.md fixture inventory
Review

Summary of Changes

Created two new fixtures:

color-swatch: Reference palette with 16 ANSI colors (fg labels + bg blocks), full 256-color cube, grayscale ramp, and truecolor gradient. 19 lines.
color-showcase: Simulated CI deploy dashboard exercising all 16 standard and bright ANSI colors through build, deploy, health check, and error sections. 20 lines.

Both are pure printf output (no setup needed), deterministic, fit 80x24, and parse cleanly through the ANSI parser. Updated fixtures/README.md inventory.