* Rename AUR package from basecamp-bin to basecamp-cli

The -bin suffix implies a source-building counterpart that doesn't exist.
basecamp-cli matches the upstream project name and AUR convention for
single-variant packages.

Drops basecamp-cli from conflicts since the package can't conflict with
itself. Keeps basecamp in conflicts to prevent co-installation with
future variants.

* Update docs for basecamp-cli AUR package name

* Fix flaky TestCircuitBreakerFailureInHalfOpenOpens under race detector

The 1ms OpenTimeout meant the circuit re-transitioned from open back to
half-open between RecordFailure and State() under race detector overhead.
Use a long timeout and backdate the open timestamp to force the half-open
transition deterministically.

GoReleaser's aurs publisher enforces -bin suffix for binary packages
per Arch packaging guidelines. The basecamp-cli name caused pkgbase
mismatch. Also add basecamp-bin and basecamp-cli to conflicts.

GoReleaser's aurs section enforces a -bin pkgbase suffix, causing
push rejection. Use aur_sources instead — builds from source on
install, avoids the suffix issue, and is the standard Arch pattern.

aur_sources requires UploadableSourceArchive artifacts, produced by
the source section. Without it, GoReleaser fails with "no linux
archives found".

GoReleaser enforces a -bin suffix on pkgbase for binary AUR packages.
We want basecamp-cli without the suffix. AUR publishing is now handled
by scripts/publish-aur.sh instead.

Generates PKGBUILD with correct pkgbase, arch-specific checksums
from the release assets, and pushes to AUR via SSH.