docs: update #000031 status + CLAUDE.md textbook layer pointers
Reflects today's surface-ingest landings — Phase 1 (PD +
open-licensed textbooks across 6/7 g4 pillars) is in progress;
Phase 2 (chunk-resolution + derivations.proof_blob warrant
promotion) is the next substantial commit.
#000031 ticket file
===================
- Status flipped from "open · awaiting go/no-go" to "in progress
· Phase 1 landed 2026-05-09".
- §8 rewritten with the landed scope: 8 textbooks ingested across
3 license-validated manifest paths (HTML, BFS crawl, PG TeX),
total ~351 docs / ~1597 chunks.
- Coverage table per g4 pillar.
- Phase 2 scope explicit: citation parser, chunk resolver,
Merkle inclusion proof writer, derivations row writer,
verifier wiring, bench. ~300-500 LOC estimate.
- Phase 3 (Mendelson + Enderton license decision) still
deferred; Hilbert-Ackermann 1928 noted as PD substitute.
docs/TICKETS.md
===============
Index row updated to reflect "in progress · Phase 1 landed".
CLAUDE.md
=========
- sources/ comment lists the new textbook_tex source.
- Added textbook-layer make-target block to the build/test/run
section — make crawl-textbooks, make textbooks-tex,
make textbook ID=<id>, with the idempotency callout.
No source-code changes — pure documentation refresh aligned to
what shipped this session (commits b38f4b8 → 514e07d).