feat: dc_rulekit v0.1 — agnostic on-device rules engine

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  rust:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo test --all
+
+  dart:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dart-lang/setup-dart@v1
+      - run: dart pub get
+        working-directory: packages/dc_rulekit
+      - run: dart analyze
+        working-directory: packages/dc_rulekit
+      - run: dart test
+        working-directory: packages/dc_rulekit

.gitignore

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+/target/
+**/.dart_tool/
+.packages
+.pub-cache/

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.1.0] - 2026-10-02
+
+### Added
+
+- Rust crate **`dc_rulekit`**: rule model, plugin registry, in-memory/file stores, proposal workflow, engine with dry-run, audit hook.
+- Dart package **`dc_rulekit`**: pure-Dart mirror of core semantics for Flutter hosts.
+- Toy plugins in **`dc_rulekit_demo_plugins`** (`demo.when.*`, `demo.then.*`).
+- ADR 0001 (agnostic core vs host plugins).
+- Unit tests for Rust and Dart.