fix(venice): harden discovery limits and tool support (#38306)

* Config: add supportsTools compat flag

* Agents: add model tool support helper

* Venice: sync discovery and fallback metadata

* Agents: skip tools for unsupported models

* Changelog: note Venice provider hardening

* Update CHANGELOG.md

* Venice: cap degraded discovery metadata

* Apply suggestion from @greptile-apps[bot]

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

* Venice: tolerate partial discovery capabilities

* Venice: tolerate missing discovery specs

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

src/config/zod-schema.core.ts

@@ -188,6 +188,7 @@ export const ModelCompatSchema = z
     supportsDeveloperRole: z.boolean().optional(),
     supportsReasoningEffort: z.boolean().optional(),
     supportsUsageInStreaming: z.boolean().optional(),
+    supportsTools: z.boolean().optional(),
     supportsStrictMode: z.boolean().optional(),
     maxTokensField: z
       .union([z.literal("max_completion_tokens"), z.literal("max_tokens")])