progressiveDisclosure() now honors options.tool_selection.disclosure before
the global ai-agent.ai_native.tool_selection.disclosure config. A single
tool-heavy agent can opt into progressive disclosure (list tool name +
description only; defer the full parameter schema to find_tools) without
flipping it on for every agent in the app. All tools stay available.

Motivation: an agent with ~23 tools was spending ~7k tokens/turn on full
parameter schemas the model rarely needed up front. Per-request progressive
disclosure cut that tool block ~10.9k → ~3.6k tokens with no loss of
capability.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>