chore: strip redundant comments and PR-number test prefixes

[Itsusinn]

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What

Two non-functional cleanups across all own crates (crates/, vendored patches/ untouched):

1. Removed redundant comments (~782 lines). Section-divider banners (// ===== Foo =====, // ── bar ──), label comments naming obvious blocks, and comments that merely restate the adjacent code (plus stray trailing comments echoing their line).
2. Stripped PR-number tokens from 22 test names. e.g. pr4_acl_ipv6_address_yields_128_host_route → acl_ipv6_address_yields_128_host_route, pr5_format_protocol_zero_alloc_output → format_protocol_zero_alloc_output, test_pr2_fragmented_udp_emits_no_info_log_noise → test_fragmented_udp_emits_no_info_log_noise. The descriptive remainder is kept.

Why

The prN_ prefixes encode PR numbers that mean nothing to a future reader, and pair with the now-removed "PRn regression tests" banner comments. The comment pass drops noise that duplicated the code while keeping every comment that earns its place: rationale/"why", invariants, SAFETY: notes, protocol/RFC references, byte-layout annotations, user-facing config-field docs, and all //!//// module/API docs.

Reviewer notes

• No logic changes. The full diff is comment deletions, trailing-comment trims, and fn renames only.
• All 22 renamed functions are in-module #[test]/#[tokio::test] fns with no external callers; no collisions after stripping.
• Updated one comment in wind-test/src/tuic.rs that referenced the old span name (test_pr2_..._noise: → test_..._noise:); the tracing-test logs_assert filter derives the span from the live fn name, so behavior is unchanged. The descriptive "PR2 demoted log …" error string was intentionally left as prose.
• cargo check --workspace --all-targets passes.
• The pending .gitmodules / .github/remote-workflows submodule setup in the working tree is unrelated and deliberately not part of this PR.

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