docs: preserve specification 0040 platform work

[bordumb]

What changed

• preserves the 26-commit specification 0040 documentation-platform implementation
• records the documentation contract, bundle, content ownership, information architecture, product journeys, reference surfaces, and qualification work
• keeps this work available while a new editorial direction begins on a clean branch

Why

This is a preservation PR. The current editorial result is not being presented as accepted or finished.

Checks

Not run for this handoff, per request.