Extractor: drawio → absolute_layout YAML scaffold (107/132 cached)

Closes the procedural hole that kept making Codex sessions fall back
to ``examples/`` for YAML scaffolding even after the SKILL forbade it.

The lookup tool returns a canonical Oracle ``.drawio`` as the geometry
source, but the agent had no YAML version of that geometry to copy —
the .drawio is XML with stencil-encoded icons. Without a scaffold,
agents reverse-engineered or fell back to ``examples/`` (which is
forbidden but happened anyway because the alternative was painful).

New tool ``tools/archcenter_drawio_to_template.py`` extracts:
  • canvas dimensions
  • containers (region / vcn / ad / subnet) classified by stroke /
    fill style markers
  • service bounding boxes with ``type: TODO_identify`` (the icon
    type is encoded in stencil bytes — agent fills it from the
    renderer's TYPE_TO_ICON aliases when authoring the spec)
  • edge waypoints (source, target, points)

Output lands at ``kb/diagram/assets/archcenter-refs/<slug>/_template.yaml``
next to the .drawio. Lookup now surfaces it as
``cached: yaml=<path>`` so the agent has a one-step "copy this YAML
and adapt" path.

Ran across all 132 cached folders: 107 templates emitted, 24 had no
.drawio (zip didn't ship one), 1 already cached.

Other persistent guardrails added in this commit:

- SKILL.md option 2 step 3: explicit reminder that valid ``type:``
  values come from ``TYPE_TO_ICON`` / ``ICON_TYPE_ALIASES`` in the
  renderer source plus the icon-index JSON files. Do NOT grep
  ``examples/`` for ``type:`` — that's where the previous Codex
  session was looking, against the rule.

- ``make archcenter-templates-refresh`` Makefile target.

- The lookup index now also indexes ``_template.yaml`` per slug.

- Auto-extracted templates committed under
  ``kb/diagram/assets/archcenter-refs/*/_template.yaml`` so a fresh
  clone has them on first lookup (no extraction step needed).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Makefile

@@ -1,6 +1,6 @@
 # OCI Deal Accelerator — Build Automation
 
-.PHONY: help install test validate example diagram deck full clean lint codex-package update-icons freshness freshness-refresh sync-skill sku-discover pptx-icons-refresh archcenter-benchmark-20 diagram-lookup diagram-validate-spec archcenter-descriptions-refresh diagram-spec-audit archcenter-smoke install-hooks
+.PHONY: help install test validate example diagram deck full clean lint codex-package update-icons freshness freshness-refresh sync-skill sku-discover pptx-icons-refresh archcenter-benchmark-20 diagram-lookup diagram-validate-spec archcenter-descriptions-refresh diagram-spec-audit archcenter-smoke install-hooks archcenter-templates-refresh
 
 # Use venv if present, otherwise find best available python3
 ifneq (,$(wildcard .venv/bin/python))
@@ -114,6 +114,9 @@ diagram-spec-audit: ## Run spec validator across every diagram-spec in examples/
 archcenter-descriptions-refresh: ## Re-fetch _description.md for every Architecture Center entry
 	$(PYTHON) tools/archcenter_description_fetcher.py --limit 200 --sleep 0.5
 
+archcenter-templates-refresh: ## Extract absolute_layout YAML scaffolds from every cached .drawio
+	$(PYTHON) tools/archcenter_drawio_to_template.py
+
 archcenter-smoke: ## 3-case Architecture Center reconstruction smoke test (CI-friendly)
 	$(PYTHON) tools/oci_archcenter_batch.py \
 		--limit 3 \