feat: let builder use caller or platform llm

agent_builder/skills/a2apack-agent-authoring/SKILL.md

@@ -24,8 +24,10 @@ Use `A2AAgent` class attributes for runtime and marketplace behavior:
 For generated/user-owned agents that call an LLM, default to
 `LLMProvisioning.CALLER_PROVIDED` with `Pricing(..., caller_pays_llm=True, ...)`.
 Use `LLMProvisioning.PLATFORM` only when the user explicitly wants
-platform-paid LLM usage. In either mode, read `ctx.llm`; never read
-`A2A_LITELLM_KEY`, provider keys, or platform secrets directly.
+platform-paid LLM usage. Reserve `LLMProvisioning.PLATFORM_OR_CALLER_PROVIDED`
+for trusted platform/meta agents that must work with either the caller's
+selected creds or a platform fallback grant. In every mode, read `ctx.llm`;
+never read `A2A_LITELLM_KEY`, provider keys, or platform secrets directly.
 
 Keep each `@skill` method `async`, put `RunContext[...]` immediately after
 `self`, and annotate every public argument. Do not use `*args` or `**kwargs`;

agent_builder/skills/agent-quality-review/SKILL.md

@@ -31,7 +31,8 @@ Check these items:
 - The public schema is small and stable. No unbounded command strings, hidden
   prompt fragments, or provider credentials as public inputs.
 - The implementation reads `ctx.llm` for both `CALLER_PROVIDED` and
-  `PLATFORM` LLM provisioning.
+  `PLATFORM` LLM provisioning. `PLATFORM_OR_CALLER_PROVIDED` is acceptable
+  only for trusted platform/meta agents and must also read `ctx.llm`.
 - Generated/user agents should default to
   `llm_provisioning = LLMProvisioning.CALLER_PROVIDED` and
   `Pricing(..., caller_pays_llm=True, ...)`. If the user explicitly wants