feat(ITC-WP-0016): establish PracticePattern language

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a025c2-407a-7a32-b40a-f37a52f03f62

infospace/indexes/concept-ownership.yaml

@@ -1,4 +1,4 @@
-concept_count: 110
+concept_count: 114
 concepts:
 - concept: "Assimilation \u2014 IT Capability Canon (ITCC) v0.1"
   owner: assimilation/it-capability-canon
@@ -268,6 +268,10 @@ concepts:
   owner: pattern/intent-scope-purposes
   path: patterns/intent-scope-purposes.md
   source: frontmatter.owned_concepts
+- concept: InterfaceDeprecationStrangler
+  owner: practice-pattern/interface-deprecation-strangler
+  path: patterns/InterfaceDeprecationStrangler.md
+  source: artifact_title
 - concept: Intake and Assimilation Practice
   owner: practice/intake-and-assimilation
   path: assimilation/intake-and-assimilation-practice.md
@@ -300,6 +304,18 @@ concepts:
   owner: review-kit/alignment/workplan-template
   path: agent/templates/consumer-alignment-workplan.template.md
   source: artifact_title
+- concept: PracticePattern Scheme
+  owner: scheme/practice-pattern
+  path: patterns/PracticePatternScheme.md
+  source: artifact_title
+- concept: PracticePattern
+  owner: scheme/practice-pattern
+  path: patterns/PracticePatternScheme.md
+  source: frontmatter.owned_concepts
+- concept: PatternLanguage
+  owner: scheme/practice-pattern
+  path: patterns/PracticePatternScheme.md
+  source: frontmatter.owned_concepts
 - concept: Namespace Per Tenant Control
   owner: small-saas/control/namespace-per-tenant
   path: profiles/small-saas/artifacts/control.namespace-per-tenant.yaml