feat: add databricks fable 5.1 model capabilities (#7213)

## Summary
- add the canonical public Databricks `Claude Fable 5.1` model record
- match the existing Fable family contract: adaptive thinking,
`low|medium|high|xhigh|max`, default `high`, Anthropic Messages, and no
normalization
- add generated Rust/TypeScript corpus coverage and canonical Global
Defaults label/persistence coverage
- remove deployment-specific catalog references from the repository

## Scope
This is metadata and regression coverage only. It does not change
model-capability resolution or production frontend logic.

## Validation
- `cargo fmt --check`
- `node --test
desktop/src/features/agents/ui/modelCapabilitiesCorpus.test.mjs`
- `cargo test -p buzz-agent`
- `pnpm build:e2e`
- `pnpm exec playwright test --project=smoke --grep 'defaults render the
Fable 5.1 label without changing the persisted id'` — 1 passed
- repository search for the removed catalog prefix — no matches

Signed-off-by: Kalvin Chau <kalvin@block.xyz>
Co-authored-by: am <6e30cd56c30e030cd31bb0939b94a7c257c9a09d5ba2d92cf2735da45629f248@buzz.block.builderlab.xyz>

scripts/model-capabilities.json

@@ -487,6 +487,24 @@
       "_provenance": "all axes materialized from family:anthropic-adaptive-xhigh-fable-5",
       "_source": "models.dev anthropic catalog label; Databricks workspace endpoint is absent from its provider catalog"
     },
+    {
+      "provider": "databricks_v2",
+      "raw_model_id": "databricks-claude-fable-5-1",
+      "registry_label": "Claude Fable 5.1",
+      "thinking_mode": "adaptive",
+      "supported_efforts": [
+        "low",
+        "medium",
+        "high",
+        "xhigh",
+        "max"
+      ],
+      "default_effort": "high",
+      "databricks_v2_wire_route": "anthropic-messages",
+      "normalization_policy": "none",
+      "_provenance": "all axes materialized from family:anthropic-adaptive-xhigh-fable-5",
+      "_source": "models.dev anthropic catalog label; Databricks workspace endpoint is absent from its provider catalog"
+    },
     {
       "provider": "databricks_v2",
       "raw_model_id": "databricks-claude-opus-4-8",

scripts/normative-corpus.json

@@ -759,6 +759,26 @@
       "registry_label": null
     }
   },
+  {
+    "id": "dbv2-claude-fable-5-1-exact-record-probe",
+    "provider": "databricks_v2",
+    "raw_model_id": "databricks-claude-fable-5-1",
+    "_note": "Probes the canonical Databricks Fable 5.1 endpoint record.",
+    "expect": {
+      "thinking_mode": "adaptive",
+      "supported_efforts": [
+        "low",
+        "medium",
+        "high",
+        "xhigh",
+        "max"
+      ],
+      "default_effort": "high",
+      "databricks_v2_wire_route": "anthropic-messages",
+      "normalization_policy": "none",
+      "registry_label": "Claude Fable 5.1"
+    }
+  },
   {
     "id": "dbv2-claude-opus-4-8-exact-record-probe",
     "provider": "databricks_v2",
@@ -2708,10 +2728,10 @@
     }
   },
   {
-    "id": "dbv2-uc-goose-deepseek-strip-probe",
+    "id": "dbv2-uc-fqn-deepseek-strip-probe",
     "provider": "databricks_v2",
-    "raw_model_id": "data_workflow_tools.goose.goose-deepseek-v4-pro-0813",
-    "_note": "Probes strip parity on a goose- prefixed UC FQN carrying the deepseek- token.",
+    "raw_model_id": "system.ai.deepseek-v4-pro-0813",
+    "_note": "Probes strip parity on a UC FQN carrying the deepseek- token.",
     "expect": {
       "thinking_mode": "none",
       "supported_efforts": [