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Walking skeleton: end-to-end per-domain matrix projection on a 1-cell slice

Goal

Prove the whole projection pipeline end-to-end on a minimal slice: a typed coordinate (incl. domain) on ONE cycle event flows through a trivial read_matrix() and renders one OPEN/CURED cell inside its domain’s isolated sub-matrix, joined to the floor. The skeleton is the linear-DAG root; later sections deepen each stage without changing the pipeline shape.

Implementation Sketch

Add the minimal typed coordinate (domain, shape_id, mechanism_class) as OPTIONAL fields to ONE ledger binding; a trivial ledger_matrix.project_skeleton() folds a single cycle to a single cell inside one domain partition; a smoke render prints the 1x1 grid under its domain header. No propagation, no rank, no migration yet — only the data path from appended event to rendered per-domain cell.

Spec References

learning-ledger.md §5 append-only (optional fields preserve it); §13.2 derived read-view precedent. Design v6 D-CORE + D6 + D7 (domain isolation).

Work Items

  • Add optional domain + shape_id + mechanism_class to the v7 ledger binding ($defs/LedgerEntry); append-only intact (existing 285 entries valid without them).
  • Author scripts/plan_corpus/ledger_matrix.py with a trivial project_skeleton(plan_dir) folding one cycle to one cell inside its domain partition + a 1x1 per-domain smoke render.
  • Skeleton test: an appended cycle with a (domain, coordinate) renders exactly one cell under its domain; an entry without a coordinate is tolerated.

Fresh intel (regenerated)

{ “schema_version”: 1, “target”: { “kind”: “plan-section”, “ref”: “ledger-matrix/s-bc45b69f” }, “generated_at”: “2026-06-29T15:47:51.170043+00:00”, “graph_state”: { “head_sha”: “6b4f84d0”, “last_code_import_at”: “2026-06-29T15:46:30.042Z”, “embedding_stale”: true, “insights_stale”: false, “cpg_stale”: false }, “surfaces”: {}, “summary”: “intel-package[plan-section:ledger-matrix/s-bc45b69f] agent-authored dossier”, “degraded”: false, “dossier”: { “objective_symbols”: [], “tiers”: {}, “agent_authored”: true, “constrained_symbols”: [ “assemble_corpus”, “_FORBIDDEN_REFERENCES”, “validate_ledger_append_only”, “validate_evolution_append_only” ], “difficulty”: { “class”: “routine”, “research_online”: false, “research_mode”: “auto”, “signals”: [], “plan_dir”: “/home/eric/projects/ori_lang/plans/ledger-matrix” } } }

(full dossier: walking-skeleton—s-bc45b69f.intel.json)