When the LLM splits a category group into multiple technique pages,
moments were blanket-linked to the last page in the loop, leaving all
other pages as orphans with 0 key moments (48 out of 204 pages affected).
Added moment_indices field to SynthesizedPage schema and synthesis prompt
so the LLM explicitly declares which input moments each page covers.
Stage 5 now uses these indices for targeted linking instead of the broken
blanket approach. Tags are also computed per-page from linked moments
only, fixing cross-contamination (e.g. "stereo imaging" tag appearing
on gain staging pages).
Deleted 48 orphan technique pages from the database.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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