docs: define a seam as the (Service, Service provider, Consumer) trio

docs/subsystems/workspace.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/subsystems/workspace.md
-workspace.md: ca088a2091a7f47a3d52992fec13fae44061a608
-workspace.zh.md: e414c759a043f934e1a8b5d89c7a3b6101bbb6f4
+workspace.md: 21b08bd8b0936e9c7357ad15e7ff4176a981a042
+workspace.zh.md: 30bfc0054880ca82b5f7c64780d405524656a1f1