[config] fork.toml inherits default 0.0.0.0:9091 metrics bind — exposes fork metrics to LAN

[obchain]

Refs #52

File: config/fork.toml

Problem

PR #50 #213 flagged that default 0.0.0.0 metrics bind exposes endpoint publicly. fork.toml inherits this default. Operator running fork profile on laptop with public Wi-Fi exposes /metrics to the network.

Fix

In config/fork.toml explicitly set:

[metrics]
enabled = true
bind = "127.0.0.1:9091"

Applies regardless of default resolution in PR #50.

[obchain]

Fixed on feat/24-anvil-fork (4969bb7): fork.toml now binds the metrics exporter to 127.0.0.1:9091 with an inline comment explaining that the fork profile is a local-only demo surface, the exporter has no auth, and loopback is the only responsible default (cross-ref #213).