- E405: add documentation for all CDN origin values
- E410: fix doc style for format_directive, strict_policy, default_policy
- E600: move Alcotest.run to test.ml, export suite from test_csp.ml

Convert all packages from:
(source (uri https://tangled.org/handle/repo))
to:
(source (tangled handle/repo))

This uses dune 3.21's native tangled support for cleaner source
declarations. Also removes redundant homepage/bug_reports fields
that are auto-generated from tangled sources.