1.8.2

v1.8.2: glow gate — only suppress off-topic CONTENT-RICH notes, let stubs glow

1.8.1 gated ALL empty stubs (glow only if structurally tied), which left notes with
NOTHING highlighted — e.g. an on-topic but empty "LLM" stub stopped glowing in an
essay about LLMs. Now that off-topic notes with real content (a math "Analysis" full
of calculus) are caught by the centered semantic test, the blunt stub rule is no
longer needed.

New glowAllowed: gate ONLY a content-rich target (chunkCount > 1) that is both
off-topic (centered similarity < GLOW_CONTEXT_FLOOR) AND not structurally tied (no
link either direction, no shared tag). Everything else glows — empty stubs (concept
placeholders to link/build out), on-topic notes, and linked/tagged notes. Extracted
the structural test into structurallyTied(). No re-embed.

Verified live: in the security essay, "analysis" (now a content-rich math note) stays
gated, while "llm" (empty stub) glows again — highlighting is back without the
off-topic noise.