chore(deps): repin bifrost 1.1.4→1.1.5 + v0.22.1

Adopt bifrost 1.1.5 (reference-impl posture — take the dep's canonical
hardening). 1.1.5 is a clean patch on the frozen v0.6 wire (no schema /
handshake change):

- fix: gate ALL optional store verbs → clean `unsupported_capability`
  (not 500), extending 1.1.4's maintenance-verb hasattr-backstop to the
  full optional-verb set. Directly improves our provider's error
  semantics on any unimplemented optional verb.
- feat: v0.6 memory verb-floor conformance harness (test infra).
- two docs clarifications (no runtime impact).

Verified: uv lock + sync resolved 1.1.5 from the gitea index; suite
494 green on 1.1.5; the :8392 combined provider restarted onto 1.1.5
(clean uvicorn boot, stores preserved). Patch bump v0.22.0→v0.22.1.

uv.lock

@@ -70,14 +70,14 @@ wheels = [
 
 [[package]]
 name = "bifrost"
-version = "1.1.4"
+version = "1.1.5"
 source = { registry = "https://gitea.phasefinal.com/api/packages/vh/pypi/simple/" }
 dependencies = [
     { name = "jsonschema" },
 ]
-sdist = { url = "https://gitea.phasefinal.com/api/packages/vh/pypi/files/bifrost/1.1.4/bifrost-1.1.4.tar.gz", hash = "sha256:498d156035a93bf37a6fc1e9c09b468aac61e869fd2a5353e2695dc823f57e9a" }
+sdist = { url = "https://gitea.phasefinal.com/api/packages/vh/pypi/files/bifrost/1.1.5/bifrost-1.1.5.tar.gz", hash = "sha256:8554b73e5b4f9d285cf91bb3d5e2e668ae7880b91601637394433cd9b9a149f8" }
 wheels = [
-    { url = "https://gitea.phasefinal.com/api/packages/vh/pypi/files/bifrost/1.1.4/bifrost-1.1.4-py3-none-any.whl", hash = "sha256:d67278528f12729eef0c19d875d36a2f1da6fa97737396ba130d525fee8d0b14" },
+    { url = "https://gitea.phasefinal.com/api/packages/vh/pypi/files/bifrost/1.1.5/bifrost-1.1.5-py3-none-any.whl", hash = "sha256:1cdcc893a5e04f58bfa1fac33fad62c930ba58b3594a9fd6eb54162a761160d2" },
 ]
 
 [[package]]
@@ -463,7 +463,7 @@ wheels = [
 
 [[package]]
 name = "ratatoskr"
-version = "0.22.0"
+version = "0.22.1"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },
@@ -495,7 +495,7 @@ web = [
 
 [package.metadata]
 requires-dist = [
-    { name = "bifrost", marker = "extra == 'provider'", specifier = "==1.1.4", index = "https://gitea.phasefinal.com/api/packages/vh/pypi/simple/" },
+    { name = "bifrost", marker = "extra == 'provider'", specifier = "==1.1.5", index = "https://gitea.phasefinal.com/api/packages/vh/pypi/simple/" },
     { name = "httpx", specifier = ">=0.27" },
     { name = "jsonschema", marker = "extra == 'provider'", specifier = ">=4" },
     { name = "mypy", marker = "extra == 'dev'", specifier = ">=1.11" },