L-CONSOLIDATE-16: restructure 48 chapters → 16 thick R3-compliant chapters (PLAN ONLY)

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Mission

Design (not yet execute) the restructuring of the current 48-entry monograph chapter set into 16 thick R3-compliant chapters totalling ≤400 pp (Springer LNM ceiling).

Defense T-38 (2026-06-15). Rehearsal #2 T-17 (2026-05-25). Live dashboard https://trios-production.up.railway.app/ shows 48 chapters, 0/48 R3 ≥1500 lines. Current PDF ≈1243 pp >> 400.

DELTA's L-PHASE1-R3 honest finding (PR #592, merged): chapters fa-1..fa-5 cap at ~500 lines without padding. The conclusion is structural: source MDs are too short. We need fewer, thicker chapters.

Scope of THIS PR (plan only)

This PR delivers the design document mapping 48 sources → 16 targets. No actual chapter merging happens here. Existing ch_NN.tex and NN-named.tex files are untouched. The actual merge is L-CONSOLIDATE-16-EXEC (separate PR per phase).

Deliverables

1. docs/phd/restructure/CONSOLIDATION_PLAN.md — primary design doc with mapping table, grouping rationale, page budget, migration order, anti-padding rules.
2. docs/phd/restructure/chapter_map.json — machine-readable mapping (16 targets × N sources each).
3. docs/phd/restructure/RISK_REGISTER.md — explicit risk inventory: cross-refs that will break, Coq theorem references in *.v files, bibliography orphan risk, tectonic compile order.
4. scripts/consolidation_check.py — validator: every source accounted for once, page budget ≤400, narrative_spine non-empty per target. Exit 0/1 with diff.

Source inventory (48 = 34 fa- + 14 ap-)

The 48 figure comes from the dashboard's ssot.chapters table:

• 34 fa-NN-* slugs (main body) — corresponds to ch_NN.tex files (35 incl. ch_35_mesh_node).
• 14 ap-* slugs (appendices) — out of scope for chapter consolidation per Springer LNM convention; appendices keep their own structure.

This PR's 16-target plan covers the 34 main-body chapters (and acknowledges the 35 ch_NN + 34 named-companion = 69 actual .tex files which the plan must reconcile).

Acceptance

• L1 All 34 fa-NN main-body chapters mapped to exactly one of 16 targets. No orphans, no duplicates.
• L2 Each target chapter ≥3 source slugs OR exactly 1 source slug already ≥1500 lines.
• L3 Total estimated pages (sum of target_lines / 50) ≤ 400.
• L4 scripts/consolidation_check.py exits 0 on the produced JSON.
• L5 Plan documents the parallel NN-named.tex series (Vesica Piscis / Metatron / etc.) and how it merges with the ch_NN.tex auto-gen series — no fabricated chapters.
• CI green; cargo run -q -p trios-phd -- --phd-root docs/phd audit passes.

Out of scope

• Actual chapter file merging.
• Appendices ap-* restructuring.
• Coq proof renaming.
• Bibliography pruning.

These belong to follow-up issues L-CONSOLIDATE-16-EXEC (per-phase merge) and downstream lanes.

Anchor

phi^2 + phi^-2 = 3 · DOI 10.5281/zenodo.19227877