Sync opam package metadata including x-maintenance-intent
and external dependency specifications.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Update homepage/bug_reports in dune-project files to use the actual
upstream URLs (anil.recoil.org, github.com/mirage) instead of the
fork URLs. sources.toml overrides these when publishing to the fork.

- Format source files with ocamlformat
- Add .ocamlformat with disable=true to lexicons/ subdirectories
to prevent reformatting of generated code

- Add README files for jsonwt, owntracks, monopam, and srcsetter
- Fix langdetect language count (47→49) in dune-project
- Remove unused variable in crockford encode function
- Improve retention type documentation in zulip channels.mli
- Refactor conpool is_healthy to reduce nesting and improve clarity
- Document unimplemented IDNA features in punycode README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>