docs: add the weather widget implementation plan

Nine tasks, TDD throughout: the domain tables and parser get tests, the
card gets a screenshot.

The icon codepoints in the plan were each rendered and inspected rather
than derived. That caught U+E30A, which is present in the font and draws
a sun-with-rain, standing in for snow; the correct glyph is U+E31A. A
wrong-but-present codepoint fails this way, plausibly, which is why the
plan tells the implementer to look at the rendered sheet instead of
trusting a fontconfig query.

Task 6 and Task 8 both state which outcomes are acceptable when the OWM
key is still activating, so an inactive key blocks neither.

Paths are relative to the repo root rather than absolute: the first
version of this file hardcoded a home directory in eighteen places and
the pre-commit hook rejected it, correctly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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