build: scaffold the Gradle project and draw floret-kit from source

Copied from Agendula, which is the family's current template: AGP 9.x
conventions, the shared version catalog, and the F-Droid reproducibility
invariants that are load-bearing rather than cosmetic — no foojay toolchain
resolver anywhere, vcsInfo off on release, dependenciesInfo out of the APK.

floret-kit comes in as a git submodule wired up as a Gradle composite build,
so the kit is built from source and pinned by commit, exactly as its
ARCHITECTURE.md prescribes.

Two deliberate divergences from Agendula's catalog:

- Room replaces Glance. Clockula owns its storage (docs/PLAN.md §0) and ships
  no widget in v1 (§1, decision 2). The schema is exported to a committed
  directory, because a migration is only reviewable against a recorded
  previous version.
- :provider and core-reminders are dropped. There is no vendored task
  provider here, and Agendula's reminder lead-time model is not the shape
  Clockula's scheduling takes.

Version starts at 0.1.0 / 100.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L94fydiJC37LtxVusNQBDy

.gitignore

@@ -0,0 +1,86 @@
+# Built application files
+*.apk
+*.aar
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+release/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log files
+*.log
+
+# Android Studio / IntelliJ
+*.iml
+.idea/
+.navigation/
+captures/
+.externalNativeBuild/
+.cxx/
+
+# Keystore files
+*.jks
+*.keystore
+*.p12
+/key.properties
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# F-Droid local artifacts (the pipeline generates them in CI)
+/fdroid/
+
+# Release-pipeline scratch files. release.yaml writes these into the workspace
+# while cutting a release; a self-hosted runner reuses that workspace, so they
+# must never end up committed (in Agendula, release-notes.md did, up to 0.3.2).
+/release-notes.md
+/payload.json
+/existing.json
+/response.json
+/cb-payload.json
+/cb-response.json
+
+# KSP
+.ksp/
+
+# Editor swap/backup files
+*.swp
+*.swo
+*~
+
+# Google Play Developer API service-account key. Reconstructed in CI from the
+# PLAY_SERVICE_ACCOUNT_JSON secret and shredded afterwards — never committed.
+/play-service-account.json
+
+# fastlane (Play uploader only — see fastlane/Fastfile)
+/fastlane/report.xml
+/fastlane/README.md
+/vendor/bundle/
+/.bundle/
+Gemfile.lock
+
+# Claude Code
+/CLAUDE.md