docs: UI shell rework wave-1 implementation plan

Detailed 22-task plan for the foundation wave (build pipeline + theme
port + every CSS primitive, no page migration yet). Smoke-test page at
_primitives-smoke.html is the wave-1 QA gate. Waves 2-4 will get their
own plan documents after each prior wave ships.
This commit is contained in:
Zac Gaetano 2026-05-21 10:53:31 -04:00
parent b77a370eb7
commit c97759dc4e

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