ci: switch tag scheme to per-day mutable vYYYY.MM.DD

Drops the trailing patch digit from the CalVer model. Same-day
re-releases force-move the tag (and overwrite both the docker image
and the release asset of the same name). :latest is now updated by
every main push AND every tag push, so it always reflects the
newest blessed image without a separate cut step.

Comment-only changes — the workflow glob is already 'v*', so the
existing pipeline accepts the new format with no code changes.

.gitea/workflows/android.yml

@@ -5,6 +5,10 @@ name: android
 # minstrel-android-<tag>.apk to minstrel-<tag>.apk so the server's bundled
 # in-app-update channel (release.yml polls this name) resolves to the
 # native APK with no further changes.
+#
+# Tag format: vYYYY.MM.DD (per-day CalVer, mutable within the day). If a
+# tag is force-moved within the day, this workflow re-runs and overwrites
+# the existing release asset — same name, new content.
 
 on:
   push:

.gitea/workflows/release.yml

@@ -2,9 +2,15 @@ name: release
 
 # Builds and pushes the minstrel container image to the Gitea registry.
 #
-#   push to main         → :main and :latest
-#   push tag vX.Y.Z      → :vX.Y.Z and :latest
-#   workflow_dispatch    → manual trigger (same rules based on the ref)
+#   push to main             → :main and :latest
+#   push tag vYYYY.MM.DD     → :vYYYY.MM.DD and :latest
+#   workflow_dispatch        → manual trigger (same rules based on the ref)
+#
+# Release model: per-day CalVer tags (no trailing patch digit). The day's
+# tag is intentionally mutable — if a second release happens the same day,
+# move the tag with `git push -f origin vYYYY.MM.DD` and the image tag of
+# the same name gets overwritten. :latest is updated by every main push
+# AND every tag push, so it always reflects the newest blessed image.
 
 on:
   push:
@@ -57,8 +63,8 @@ jobs:
           else
             # Main is the protected, post-PR-merge branch. Treat it as the
             # rolling stable channel — every main push moves :latest.
-            # Pinned consumers can target :vX.Y.Z; everyone else gets the
-            # newest main.
+            # Pinned consumers can target :vYYYY.MM.DD; everyone else
+            # gets the newest main.
             echo "args=-t ${IMAGE}:main -t ${IMAGE}:latest" >> "$GITHUB_OUTPUT"
             echo "version=main" >> "$GITHUB_OUTPUT"
             echo "::notice::Main-branch build: :main + :latest"