chore(phd): substitute remaining 'Neon' references with 'Railway phd-postgres-ssot' #522

chore(phd): substitute remaining Neon references with Railway phd-postgres-ssot

Tracker for the documentation cleanup PR (#520).

Scope

Documentation-only post-migration cleanup. The PhD SSOT lives on Railway phd-postgres-ssot (interchange.proxy.rlwy.net:30942, project IGLA, db railway) since the schema DDL was applied. Remaining Neon / export-neon strings in docs/phd/* are stale and contradict the active source of truth.

Files in scope (8)

docs/phd/AUDIT_REPORT.md
docs/phd/appendix/E-lexicon.tex
docs/phd/appendix/K-agent-memory.tex
docs/phd/appendix/L-pollen-channel.tex
docs/phd/chapters/15-kepler-solids.tex
docs/phd/chapters/ch_15.tex
docs/phd/main.tex
docs/phd/v5-hero-fullwidth.md

Acceptance

• PR chore(phd): substitute remaining 'Neon' references with 'Railway phd-postgres-ssot' (refs #446 #380 #498) #520 CI green
• No Rust / pipeline / CI changes (idempotent doc-only diff)
• Tectonic build still green on EN+RU
• No remaining occurrences of export-neon or "wait for Neon" in docs/phd/

Refs

• Part of 🌻 EPIC — E2E TTT Pipeline O(1) · Ring-Pattern Refactor (3 GOLD × ~19 SR) #446 (PhD pipeline reproducibility, observability)
• Part of 🌻 GOLDEN SUNFLOWERS — Trinity S³AI / Flos Aureus (UNIFIED v6.2 · 98 ch · 2.53M ch · 2173 thm) #380 (PhD SSOT migration)

Anchor: φ² + φ⁻² = 3 · TRINITY · NEVER STOP