fix(ci): rewrite mode-init-order test and retry deps install

Two CI failures from the first run, neither a real bug in production code.

The Emacs-snapshot job failed on
`test-wttrin-mode-initialization-order-normal-mode-before-buffer-local-vars-calls-mode-first`.
The original test mocked the `set' primitive to detect when
`xterm-color--state' was first set. That worked on the byte-code path some
older Emacs versions used, but `setq-local' doesn't go through the `set'
function on Emacs master, so the mock never fired and the assertion read nil.
The test was already brittle in isolation locally too.

Rewrote the test to use `advice-add :before' on `wttrin-mode' and
`make-local-variable'. Both are ordinary advisable functions, and
`make-local-variable' is on the code path for every form that defines a
buffer-local binding (`setq-local', `defvar-local', etc.) so the observation
holds across Emacs versions. Renamed the test to drop "calls-mode-first"
and use "mode-runs-before-xterm-color-state-binding" since that's what the
new advice actually observes.

The Emacs 26.3 job failed with a transient DNS error from elpa.gnu.org
during `make deps'. Wrapped the install step in a 3-attempt retry with a
15-second backoff so a runner-side network blip doesn't fail the build.
Applied to all three jobs (test, lint, coverage) since they all hit the
same archives.

0 files changed, 0 insertions, 0 deletions