Per fox 2026-06-01: same treatment as #000071 — replace the
review-archaeology structure with what we SHOULD grow. Ticket goes
from 978 lines (original Anchor6 §§1-8 design log + dav1d-review §0
retrofit) to 498 lines of directive spec. **Joseph6 stays as the
first registered example grammar** per fox's note — concrete enough
that an implementer sees what a WorldDimensionGrammar looks like
end-to-end, not abstract enough to lose its load-bearing role.
What changed in shape:
Before: §0 dav1d verdict retrofit + §§1-8 archaeology of the
original Anchor6 spec being reviewed (validate seed source,
segmentation method, mapper choice — all decisions long
since made).
After: §1-13 forward spec. Goal · Axis split · Hard constraints
(all phases) · AnchorN primitive · WorldDimensionGrammar ·
Quantization mappers (with uint256-H₁ + no-SO(3) corrections
documented inline) · π*_w_object canonicalizer with
four-identity-hash record · **Joseph6 as worked example** ·
Phase 1 deliverables (9 items) · Pre-review empirical
bench preserved as §7 · Phase 2/3 deferred · Open questions
(3 remaining; 5 closed by bench, 4 by dav1d's review) ·
Cross-references · Five-step alignment · One-line review
history at the bottom.
What changed in content: nothing material. The corrected spec from
the prior §0 retrofit IS the body now. The original Anchor6 design
log is no longer inlined — git history preserves it at commit
`862662b` (pre-rewrite tip); readers who want the rejection-by-
rejection detail go to
docs/dav1d-reviews/000070-spatial-anchor-pi-w-object--2026-06-01.txt.
Critical technical corrections preserved inline (not as "what was
fixed", but as the directive answer):
- §3.1: uint256 for H₁ position (octree depth >8 entropy
preservation)
- §3.2: rename `map_rotation_so3` → `map_rotation_euler_ypr` (no
SO(3) overclaim — quantized Euler is not SO(3) coverage)
- §4: WorldObjectRecord carries all four identity hashes
(grammar_hash, axiom_pack_hash, manifest_hash, seed_hash) for
replayability
- §5: Joseph6 ships as one example grammar; future grammars
register through the same mechanism
TICKETS.md index row also rewritten in directive voice.
doc_counts tests still pass.
russell@unturf.com
cb9b57eb80