Add repo classification and work-record index

Clears C-24/C-35 (missing .repo-classification.yaml). Classified as
`research` under the agents domain: the repo defines and studies a practice
rather than shipping tooling or a product.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SQ6oF1DtVDKcD1FCpvRVLx

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 272883@bnt-lap001
Assistant-Session: f40c8f53-fb65-4980-9d29-bcdb3dd946f7

.repo-classification.yaml

@@ -0,0 +1,18 @@
+repo_classification:
+  standard: Repo Classification Standard
+  version: '1.0'
+  classified_at: '2026-09-05'
+  classified_by: agent
+  category: research
+  domain: agents
+  secondary_domains: []
+  capability_tags:
+  - governance
+  - documentation
+  - observability
+  business_stake:
+  - technology
+  - operations
+  business_mechanics:
+  - adaptation
+  - intention