chore(iroh): Update n0-watcher

[matheus23]

Description

Updates the n0-watcher dependency to the new version (that has a lot fewer Results everywhere).

• Depends on chore(netwatch): Update n0-watcher dependency net-tools#31
• Needs a release of net-tools

Breaking Changes

• Updated n0-watcher from version 0.2 to 0.3.
  Migration guide for users:
  • endpoint.node_addr().initialized().await? -> endpoint.node_addr().initialized().await (no ? needed anymore) and similarly for endpoint.home_relay() and other uses of Watchers.
  • endpoint.node_addr().get()? -> endpoint.node_addr().get() and similarly for endpoint.home_relay() and other uses of Watchers.
  • If all you have is a &impl Watcher but you need the current value, then you can't call Watcher::get anymore, as that now takes a &mut self instead of &self. You can work around this by .clone()ing to an intermediate watcher:
    watcher_ref.get() -> watcher_ref.clone().get()

Change checklist

• Self-review.
• Documentation updates following the style guide, if relevant.
• All breaking changes documented.

[github-actions]

Documentation for this PR has been generated and is available at: https://n0-computer.github.io/iroh/pr/3405/docs/iroh/

Last updated: 2025-07-28T18:01:19Z

[github-actions]

Netsim report & logs for this PR have been generated and is available at: LOGS
This report will remain available for 3 days.

Last updated for commit: d98dc64

[Frando]

Diff looks good, nice to see this simplification. Migration guide also read very good and didn't spot anything missing.

I had a quick thought if we could have the Watcher be a future so that you could skip the .initialized but don't think this is possible due to same-crate rules for trait impls on generics. Well, people will get used to the .initialized.