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Make the crate do what its documentation already claimed

Browse Source 
Review from ai-app's session, acted on.

**A test that asserted nothing.** `a_missing_tunnel_explains_itself`
returned early whenever `wg0` was up -- which it is on this VM and on the
host, so it passed everywhere and never once checked the message. The same
shape of test that let the file-permissions bug survive three codebases.
`netif` now splits the lookup from the decision: `wg_address_among` and
`addresses_among` take the interfaces, so the failure is reachable by
handing in an empty list rather than by hoping the machine has no tunnel.
Four tests where there were two, including that an IPv6-only `wg0` is not
an answer.

**Two modules the docs promised and the crate did not have.** `certs`,
which is the piece where being written twice is worst -- a trust anchor
built two ways can be built differently two ways, and the difference
reaches a phone as an opaque handshake failure. And `format`, the RON
house rules, which were byte-identical in both projects and so the
clearest thing in the evidence table. `product` names the certificate and
is the whole of what is per-project; the test decodes the DER and looks
for it there rather than trusting what was passed in.

**The README title still said wg-server-app**, three commits after
everything else was renamed.

Two judgement calls promoted from silent to written down, both of which
would otherwise be inherited rather than chosen: `WG_INTERFACE` is a
constant because *these* projects have one tunnel, which is the first
thing a third user should expect to change; and `local_addresses` puts
the emulator's host alias in every certificate, a SAN for an address the
machine does not own.

And a review heuristic the day kept proving: when you find a rule stated,
grep for its siblings. Three bugs today were the correct rule already
written down and applied to one member of a set.
This commit is contained in:
iris committed 2026-08-28 14:34:48 -04:00
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commit 841a3a8372
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