stacklok / toolhive / 29594760160

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Serve prompts per-session in vMCP (#5857)

vMCP aggregated and listed backend prompts but never served prompts/get:
injectCoreSessionCapabilities injected tools and resources per session
but skipped prompts, because the mcpcompat shim had no per-session prompt
interface. Every prompts/get returned -32602 "unknown prompt", while
prompts/list only worked because it returned the aggregated list. MCP
conformance run against a vMCP endpoint caught this (all prompts-get-*
scenarios failed).

toolhive-core v0.0.30 adds SessionWithPrompts (mirroring
SessionWithResources). Wire it in, mirroring the resource path exactly:
setSessionPromptsDirect installs the session's prompts on the SDK
session, coreSessionPrompts adapts the core's advertised prompts to SDK
prompts, and corePromptHandler routes prompts/get through core.GetPrompt
with the same identity binding, audit labelling, and authorization-denial
mapping (vmcp.DenyMessagePromptGet) the resource handler uses. Prompts are
now injected in injectCoreSessionCapabilities alongside tools and
resources.

Bumps github.com/stacklok/toolhive-core to v0.0.30.

Refs #5844

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