Restructures the custom nb-quicknav header (docs/overrides/main.html):
- Portal Guide dropdown replaces the standalone Topic Map pill → Topic Map · Methodology · Technical Tags · About.
- Videos dropdown (after Digest) promoted out of More → Video Hub · AI Agents & MCP · DevOps, IaC & SRE · Cloud Native Core · Fundamentals.
- More trimmed → Demos · FAQ · Career · V1 Archive.
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