chore(classification): add repo classification

Sector and category decided with the repository owner on 2026-08-25.
Classification is not mechanical: the sector describes intended users, so a
confident wrong value is harder to correct than a missing one.

Refs CUST-WP-0068

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 2583210@bnt-lap001
Assistant-Session: f2bff2d5-e9b2-4338-92ca-10282a927006

.repo-classification.yaml

@@ -0,0 +1,21 @@
+repo_classification:
+  standard: Repo Classification Standard
+  version: '1.0'
+  classified_at: '2026-08-25'
+  classified_by: codex
+  category: product
+  domain: communication
+  secondary_domains: []
+  capability_tags:
+  - documents
+  - integration
+  - experience
+  business_stake:
+  - experience
+  - product
+  - technology
+  business_mechanics:
+  - operation
+  notes: Chrome MV3 extension that detects a PDF in the browser, sends it to Binect
+    for physical mail, and tracks its lifecycle. Backend-free; stores no document
+    content.