fix(hello-world): centre the text, and always pass the configured colour

[ChuckBuilds]

Thirteenth plugin in the README pass — and two bugs in the plugin that new plugins are copied from, which is what makes them worth more than their size.

The default message did not fit the default panel

draw_text treats x as the left edge unless centered=True is passed. The plugin passed x=width // 2 without it, under a comment reading "Calculate positions for centered text". So "Hello, World!" began at the midpoint of a 128-wide panel and ran off the right:

Before — Hello, Worl, starting at x=64:

the text began mid-panel and was clipped by the right edge

After — centred and complete. The hero image in the README is the fixed render.

The harness could not catch this. PIL clips at draw time, so the drawn bounding box stays inside the panel and the overflow check sees nothing — check_plugin.py reports 8/8 PASS both before and after. It was only visible by looking at the output, which is exactly what generating README screenshots does.

A configured colour was silently ignored on real installs

Each draw_text call branched on whether the font manager returned a face, and the font-manager branch omitted color:

if message_font:
    draw_text(self.message, x=..., y=..., font=message_font)   # no colour
else:
    draw_text(self.message, x=..., y=..., color=self.color, font=self.bdf_font)

On any install with a font manager — the normal case on a Pi — the message drew white regardless of color.

Worth noting how close I came to missing this: my own hash-check passed the colours, because the test harness supplies no font manager, so the else branch ran. The check said "colour works" and it does, but only in the environment I was checking in. Reading the branch is what caught it.

Both branches are collapsed — font=message_font or self.bdf_font with the colour passed either way — which also halves the code.

Why this one matters beyond itself

CLAUDE.md says new plugins start from hello-world. Both mistakes are the kind that propagate silently into every plugin copied from it, so the README's template section now calls them out explicitly:

• draw_text(x=...) is the left edge — omit x to auto-centre, or pass centered=True
• pass color on every draw_text call, never in only one branch

Audits

• Config tokens: none dropped; 6/6 schema leaves documented, all six verified to change the render
• Old section list read by hand — caught that I'd dropped the Examples block; restored
• All four core doc links verified to exist before carrying them over
• check_plugin.py — 8/8 PASS; render_docs_assets --check — images match
• manifest bumped 1.0.3 → 1.1.0 (minor: rendering changes visibly)

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