The top tab bar forced Material to scope the left sidebar to the active
tab, which regressed the always-populated vertical nav. Revert
navigation.tabs (+ .sticky) so the left column behaves as before.
Apply the intended grouping in the (restored) left nav instead:
- New "Portal Guide" collapsible group: Topic Map, Methodology,
Technical Tags, About.
- about.md is pulled out of its Architectural Foundations dimension
(skipped in the generator's dimension loop) so it is not duplicated.
- Agentic Video Hub stays a prominent top-level group with its video
subpages (no longer hidden in a tab-overflow "...more" menu).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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