feat(cli): add rnr.yaml for project development tasks (#47)

* feat(cli): add rnr.yaml for project development tasks

Adds task definitions for:
- fmt: Format code with rustfmt
- clippy: Run clippy lints
- test: Run all tests
- check: Run fmt, clippy, and tests (pre-commit validation)
- build: Build release binary
- dogfood-{platform}: Build and install to .rnr/bin for specific platform
- dogfood-all: Build and install for all platforms

* chore(cli): initialize rnr with all platforms

Adds .rnr directory with binaries for all platforms and wrapper scripts
for dogfooding during development.

Author: CalvinAllen

.rnr/bin/rnr-linux-amd64

@@ -0,0 +1,7 @@
+version: 0.1.0
+platforms:
+- linux-amd64
+- macos-amd64
+- macos-arm64
+- windows-amd64
+- windows-arm64

.rnr/bin/rnr-macos-amd64

@@ -0,0 +1,30 @@
+#!/bin/sh
+set -e
+
+# Detect OS
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+EXT=""
+case "$OS" in
+  linux*) OS="linux" ;;
+  darwin*) OS="macos" ;;
+  mingw*|msys*|cygwin*) OS="windows"; EXT=".exe" ;;
+  *) echo "Error: Unsupported OS: $OS" >&2; exit 1 ;;
+esac
+
+# Detect architecture
+ARCH=$(uname -m)
+case "$ARCH" in
+  x86_64|amd64) ARCH="amd64" ;;
+  arm64|aarch64) ARCH="arm64" ;;
+  *) echo "Error: Unsupported architecture: $ARCH" >&2; exit 1 ;;
+esac
+
+BINARY="$(dirname "$0")/.rnr/bin/rnr-${OS}-${ARCH}${EXT}"
+
+if [ ! -f "$BINARY" ]; then
+  echo "Error: rnr is not configured for ${OS}-${ARCH}." >&2
+  echo "Run 'rnr init --add-platform ${OS}-${ARCH}' to add support." >&2
+  exit 1
+fi
+
+exec "$BINARY" "$@"

.rnr/bin/rnr-macos-arm64

@@ -0,0 +1,19 @@
+@echo off
+setlocal
+
+:: Detect architecture
+if "%PROCESSOR_ARCHITECTURE%"=="ARM64" (
+  set "ARCH=arm64"
+) else (
+  set "ARCH=amd64"
+)
+
+set "BINARY=%~dp0.rnr\bin\rnr-windows-%ARCH%.exe"
+
+if not exist "%BINARY%" (
+  echo Error: rnr is not configured for windows-%ARCH%. >&2
+  echo Run 'rnr init --add-platform windows-%ARCH%' to add support. >&2
+  exit /b 1
+)
+
+"%BINARY%" %*

.rnr/bin/rnr-windows-amd64.exe

@@ -0,0 +1,62 @@
+# rnr task definitions for rnr.cli development
+# Run ./rnr --list to see available tasks
+
+# Code formatting
+fmt:
+  description: Format code with rustfmt
+  cmd: cargo fmt
+
+# Linting
+clippy:
+  description: Run clippy lints
+  cmd: cargo clippy -- -D warnings
+
+# Testing
+test:
+  description: Run all tests
+  cmd: cargo test
+
+# Full validation (run before commits)
+check:
+  description: Run fmt, clippy, and tests
+  steps:
+    - task: fmt
+    - task: clippy
+    - task: test
+
+# Build
+build:
+  description: Build release binary
+  cmd: cargo build --release
+
+# Dogfooding - build and update local rnr binary
+# Use the task matching your platform, or dogfood-all for all platforms
+dogfood-windows-amd64:
+  description: Build and install to .rnr/bin (Windows x64)
+  cmd: cargo build --release && copy /Y target\release\rnr.exe .rnr\bin\rnr-windows-amd64.exe
+
+dogfood-windows-arm64:
+  description: Build and install to .rnr/bin (Windows ARM64)
+  cmd: cargo build --release && copy /Y target\release\rnr.exe .rnr\bin\rnr-windows-arm64.exe
+
+dogfood-linux-amd64:
+  description: Build and install to .rnr/bin (Linux x64)
+  cmd: cargo build --release && cp target/release/rnr .rnr/bin/rnr-linux-amd64
+
+dogfood-macos-amd64:
+  description: Build and install to .rnr/bin (macOS x64)
+  cmd: cargo build --release && cp target/release/rnr .rnr/bin/rnr-macos-amd64
+
+dogfood-macos-arm64:
+  description: Build and install to .rnr/bin (macOS ARM64)
+  cmd: cargo build --release && cp target/release/rnr .rnr/bin/rnr-macos-arm64
+
+# Build and install for all configured platforms
+dogfood-all:
+  description: Build and install to .rnr/bin for all platforms
+  steps:
+    - task: dogfood-windows-amd64
+    - task: dogfood-windows-arm64
+    - task: dogfood-linux-amd64
+    - task: dogfood-macos-amd64
+    - task: dogfood-macos-arm64