feat(acp): Add ACP wire proxy logging

[CSRessel]

Summary

🤖 Generated with Nori

• Adds config-gated ACP wire proxy logging via [acp_proxy] enabled = true, writing append-only JSONL files under $NORI_HOME/acp-wire.
• Wraps each ACP child subprocess transport with raw JSON-RPC line logging in both directions, including prompt-summary subprocesses.
• Documents the new diagnostic path and adds durable config plus real subprocess coverage.

Test Plan

• cargo test -p nori-acp
• cargo test -p nori-tui
• cargo build --bin nori && cargo test -p tui-pty-e2e
• Manual TUI smoke with elizacp, temp NORI_HOME, [acp_proxy] enabled = true, and generated wire logs
• just fmt
• just fix -p nori-acp
• just fix -p nori-tui
• git diff --check

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