docs: changelog, docs/ set, CONTRIBUTING, LICENSE

Bring floret-kit up to the family's repo conventions:
- CHANGELOG.md (Keep a Changelog) — what each module added.
- README.md — full module table (core-time/core-crash/identity/components) +
  consumption notes and a docs index.
- docs/README.md (index), docs/ARCHITECTURE.md (module layering, the submodule +
  composite-build consumption model, JVM vs android-library, the reproducibility
  rules, the share-mechanics-not-look contract), docs/ROADMAP.md (extracted vs
  deferred vs deliberately-not-shared, from the cross-app survey).
- CONTRIBUTING.md — the no-app-coupling rules, how to add a module, how an app
  adopts the kit.
- LICENSE (MIT, matching the apps).

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

CHANGELOG.md

@@ -0,0 +1,54 @@
+# Changelog
+
+All notable changes to floret-kit are documented here. The format follows
+[Keep a Changelog](https://keepachangelog.com/).
+
+floret-kit is consumed **from source** — each app embeds it as a git submodule
+and builds it through a Gradle composite build, pinning a specific commit. There
+are no binary releases; "version" tracks the shared `version` in the root build
+(currently `0.1.0`). Entries are grouped by module.
+
+## [Unreleased]
+
+### Added
+
+- **`core-time`** (JVM library) — pure-Kotlin date/time helpers, no Android and
+  no third-party dependencies:
+  - `DayWindow.today()` — local-day boundaries for smart-list logic.
+  - `Instant.formatDate()` / `formatTime()` / `formatDateTime()` — locale- and
+    zone-aware display formatting over `kotlin.time.Instant`.
+  - `TimeBridge` — `Long` epoch-millis ↔ `Instant`, for content-provider I/O.
+- **`core-crash`** (Android library) — privacy-respecting, on-device crash
+  capture and reporting. Writes an allowlist-only report (app/Android/device
+  version, locale, time, stack trace — nothing else) to private storage and
+  chains to the platform handler; uploads nothing. Includes startup crash-loop
+  detection, a report dialog that shows the full text before it leaves the
+  device, and an issue-tracker hand-off. Per-app specifics (display name, issue
+  URLs) come from a `CrashConfig` supplied at `install()`; each app keeps its
+  own thin themed `CrashReportActivity`.
+- **`identity`** (Android library) — the family's Material 3 Expressive theme
+  factory `FloretExpressiveTheme(lightScheme, darkScheme, …)` (dynamic colour on
+  API 31+, system light/dark fallback, the standard motion scheme) plus
+  `rememberNavSlideSpec()`. Each app passes its own seed-derived colour schemes
+  and typography — the mechanics are shared, the look is not.
+- **`components`** (Android library) — the shared Compose component vocabulary:
+  - `GroupedSurface` / `GroupedRow` + `Position` / `positionOf` — the canonical
+    press-morphing tonal grouped-row primitive (the Android-15 settings pattern).
+  - `InlineTextField` — the borderless tonal text input (capitalization is a
+    parameter).
+  - `OptionCard` — the sanctioned selection-dialog pick.
+  - `CollapsingScaffold` — the collapsing settings/sub-screen scaffold.
+  - `FullScreenPicker` / `OptionPicker` — the full-screen single-select picker.
+  - `pastelize()` — softens a raw provider colour to a theme-fitting pastel.
+
+  App-agnostic by design: apps compose their own screens and keep their own
+  identity chips/icons. String resources here (e.g. `back`) are fallbacks an app
+  can override.
+
+### Conventions
+
+- **No `foojay` toolchain resolver** anywhere — it can fetch a JDK at build time,
+  which reproducible / official F-Droid builds reject. Modules set `jvmTarget`
+  directly. See [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md).
+- AGP 9.x provides built-in Kotlin compilation, so Android modules apply only the
+  Android library + Compose plugins (no separate `kotlin.android`).