Phase 2: core-crash from floret-kit; complete the core-time wiring

Adds crash reporting to Agendula by drawing the kit's new core-crash module
(first Android-library module in floret-kit), and finishes the core-time wiring
that a Phase 0 staging slip left uncommitted on main.

core-crash (NEW capability — Agendula had none):
- CrashReporter.install() in AgendulaApp captures uncaught exceptions on-device
  (allowlist-only report, chains to the platform handler, uploads nothing).
- MainActivity routes to a standalone CrashReportActivity on a startup crash-loop,
  and surfaces a single captured crash as a dialog on next launch; markHealthy on
  resume. App label + issue-tracker URL flow in via CrashConfig.
- Thin app-side CrashReportActivity uses AgendulaTheme; the reusable machinery
  (reporter, dialog, submit, config) lives in the kit. Submodule re-pinned to the
  core-crash kit commit.

Completes Phase 0 (was only partially committed in ec7b696):
- Repoint DayWindow + Instant formatting imports to de.jeanlucmakiola.floret.time
  (the app copies were deleted in ec7b696 but the imports/includeBuild/dependency
  were never staged, leaving main non-building).
- settings.gradle.kts includeBuild("floret-kit"); app depends on core-time.

Also fixes the CI checkout YAML: the submodules block was mis-indented under
'uses:' (invalid step mapping) — dedented to a proper sibling.

Clean composite build + unit tests + lintDebug + debug assemble green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -15,6 +15,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Java
         uses: actions/setup-java@v4
@@ -73,6 +75,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Java
         uses: actions/setup-java@v4
@@ -322,6 +326,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Extract changelog section for this tag
         run: |