docs: add implementation plan for unified Tasks board (was never committed)

This should have been committed alongside the design spec (f626155) before
task execution began. It wasn't -- every claudomator container that cloned
this repo during the Tasks board build never actually had this file, since
containers clone from the pushed remote, not the local working tree. Tasks
dispatched with only a "read this file" instruction had nothing to read and
silently improvised instead, which explains most of the review-cycle churn
during that build far better than "the implementer didn't follow
instructions" did. Committing now for the historical record and so the
gap can't repeat for this specific file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VTUSAEKfsPc6WGDq45yPHD

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