chore(storage,workspace): gates — coverage, catalogs, bilingual note

- Per-file 100% coverage across the five new packages (invariant
  companion suites, failure-injection negatives, lifecycle and
  malformed-medium branches).
- Canonical README Model Experience / Known Limitations sections; new
  storage/ and workspace/ group READMEs; packages/README.md rows (budget
  ceiling raised 760 → 790 for the two new groups).
- Cordis catalog/type-link registrations, service-role classification,
  and regenerated catalogs/graphs for the new services and events.
- Agent Note: English body + i18n pairing record; design-sketch fences
  opted out of doc-typecheck as ignore-check.
- Two exactOptionalPropertyTypes/discriminant fixes in new tests.

doc-sync (24 gates), typecheck, hygiene, and the five-package suite
(92 tests) all pass.

packages/workspace/workspace/README.md

@@ -16,7 +16,19 @@ Session persistence is an optional peer resolved with `ctx.get`: absent, attach
 
 ## Model Experience
 
-No model-visible surface: the package registers no tools, injects no prompts, and emits no context. Token and KV-cache cost are zero.
+### Workspace records and session accounts
+
+#### What the model sees
+
+Nothing. `ctx.workspace` serves workspace records to host-side consumers only: the package registers no tools, injects no prompts, and writes no session events, so no request field ever carries this package's data.
+
+#### Token effect
+
+Zero direct tokens on every request.
+
+#### KV Cache effect
+
+Independent of live requests: the package never touches a request prefix, so it cannot invalidate provider cache reuse.
 
 ## Known Limitations and Deferred Work