The fast-moving desktop prerelease channel is now "canary" everywhere:
the tag shape (vX.Y.Z-canary.<ts>), the electron-updater/R2 feed dirs
(canary.yml / releases/<os>/canary/), the update-channel consts and CLI
choices, the MSIX build-number derivation, the App Installer channel
paths, and the Windows Store flight var (MS_STORE_CANARY_FLIGHT_ID).
Also renames the scheduled workflow to canary-release.yml and the
release test file to test_release_canary.py, and flips the CLI flags
(--canary / --prune-canaries / prune-canaries subcommand).
Unrelated "nightly" mentions are untouched: Brave's own browser channel
(browser_connect), cron scheduling prose (README, i18n, cron/browser/
kanban docs, zh-Hans), upstream skill docs (comfyui/unsloth/torchtitan),
evals fixtures, Node's node-nightly prereleases, and cron job names in
gateway tests.
Note: MS_STORE_NIGHTLY_FLIGHT_ID was renamed to MS_STORE_CANARY_FLIGHT_ID
in the workflow — the matching repo/org variable on GitHub must be
renamed in repo settings for the Store flight ring to keep working.
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