Feature request: route ACP agents (Claude Code, Qwen Code) to local Ollama models

## Problem

ACP agents such as Claude Code and Qwen Code are designed to call their provider's API (Anthropic, Alibaba, etc.) by default. Users who self-host Ollama cannot use these agents with local models without manually hacking environment variables (ANTHROPIC_BASE_URL, etc.).

## Use case

I run Ollama locally and want to use ACP coding agents (Claude Code, Qwen Code) against local models instead of cloud APIs. Currently:

- Claude Code hardcodes ANTHROPIC_BASE_URL → api.anthropic.com
- Qwen Code hardcodes its provider endpoint
- Injecting env vars globally affects ALL agents, not just the ones I want routed to Ollama

A per-agent env injection mechanism in AionCore's ACP launch policy would let users selectively route individual agents to local models while others continue using their cloud endpoints.

## Prior work

I had an implementation in PR #626 (now in draft/paused) that:
- Detected agents configured for Ollama mode
- Injected the correct env vars (ANTHROPIC_BASE_URL, auth tokens, model pins) at ACP spawn time
- Left non-Ollama agents untouched

## Question

Is per-agent env injection for local model routing something the project would consider? Happy to refactor the approach to match the team's preferred architecture.

Start by reviewing PR #626 and the ACP launch policy in AionCore, since the issue identifies that policy as the intended integration point. Determine whether per-agent environment injection fits the project architecture; done means selectively routing configured Claude Code or Qwen Code agents to Ollama while leaving other agents unchanged.

Written by the indexing model from the issue text.