docs: bilingual credentials/settings-consumer documentation, catalogs, and gates

New credentials data-structure page (type-equiv manifested), group README,
rewritten llm-deepseek/llm-pi-ai READMEs (dynamic configuration, dict
profiles, credential chain), capability-seams/service-role registration,
Agent Note (bilingual), demo compositions mounting settings-local +
credentials-local with no inline key plumbing, installSettingsSection
consumer helper on the settings seam (deduplicating both adapters' wiring),
jscpd symmetry markers for the provider twins, runtime-closure additions for
python/sdk-runtime, and doc-budget ceilings AGENTS.md 1750→1755 /
packages/README.md 850→865 for the structural one-line group rows.

scripts/type-equiv.manifest.json

@@ -1328,6 +1328,21 @@
       "doc": "docs/core-data-structures/settings.md",
       "symbol": "SettingsUpdateSource",
       "source": "packages/settings/settings/src/index.ts"
+    },
+    {
+      "doc": "docs/core-data-structures/credentials.md",
+      "symbol": "CredentialRef",
+      "source": "packages/credentials/credentials/src/index.ts"
+    },
+    {
+      "doc": "docs/core-data-structures/credentials.md",
+      "symbol": "ResolvedCredential",
+      "source": "packages/credentials/credentials/src/index.ts"
+    },
+    {
+      "doc": "docs/core-data-structures/credentials.md",
+      "symbol": "CredentialInfo",
+      "source": "packages/credentials/credentials/src/index.ts"
     }
   ]
 }