Let the release skill drive this repo, and let make drive the pipeline

The release skill only knew repos that deploy an image through a wrapper
chart. terdut-tui publishes binaries to a Gitea release and nothing else,
so its first two releases were cut by hand. It now has a .release.conf
saying KIND=binary, which the skill treats as gate, tag, wait for the
pipeline, then check what was published.

The gate had to exist as make targets for that: fmt, lint and test, the
same three the other repos have. ci.yaml and release.yaml now call them
instead of carrying their own copy of gofmt, vet and the tests, so a green
gate locally and a green pipeline are the same code and cannot drift. The
gofmt handling moved over as written, including the comment on why both of
its failure modes need catching; both fail the target, checked with a
misformatted file and an unparseable one.

The binaries job calls make dist too. DIST_TARGETS is now the one place
that says what a release contains, and dist-assets prints the names dist
builds so the skill can verify the published release against a list
instead of a count. The names are unchanged, and they are the self-updater's
contract with every installed binary: internal/updater matches
terdut-tui-<tag>-<goos>-<goarch> exactly.

CLAUDE.md gains a Release section, including that the annotated tag's
message is what appears on the release page.

Not run in the pipeline yet: make is in the golang image, as terdut-server's
CI relies on, but this repo's workflows only exercise it on the push that
carries this commit, and make dist only on the next tag. A failure in the
release workflow's test job stops the publish rather than shipping
something unchecked.

.release.conf

@@ -0,0 +1,9 @@
+# Read by the `release` skill (~/.claude/skills/release).
+#
+# terdut-tui publishes binaries to a Gitea release and nothing else: no image, no Helm
+# chart, no wrapper in Ryuvia/charts. KIND=binary tells the skill to gate, tag, wait for
+# release.yaml and verify the published assets, and to skip the chart steps.
+KIND=binary
+
+# English, like the rest of the terdut projects.
+PROSE_LANG=en