Add RC example for MLE team testing

Author: michaeldwan

examples/rc/README.md

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+# Cog 0.17.0-rc.2
+
+## Prerelease CLI
+
+```bash
+# macOS ARM
+sudo curl -o /usr/local/bin/cog -L \
+  https://github.com/replicate/cog/releases/download/v0.17.0-rc.2/cog_Darwin_arm64
+sudo chmod +x /usr/local/bin/cog
+sudo xattr -d com.apple.quarantine /usr/local/bin/cog
+```
+
+## Prerelease SDK
+
+Pin `sdk_version` in your `cog.yaml` to use the RC SDK and coglet inside the container:
+
+```yaml
+build:
+  python_version: "3.14"
+  python_requirements: requirements.txt
+  sdk_version: "0.17.0rc2"
+predict: "predict.py:Predictor"
+```
+
+Without `sdk_version`, the CLI installs whatever SDK version it was built with.
+The RC coglet (Rust HTTP server) is pulled automatically as a dependency of the SDK.
+
+## Try it
+
+```bash
+cd examples/rc
+cog predict -i text=hello
+# => HELLO
+```
+
+Add `--debug` to see the coglet boot logs with version info.

examples/rc/cog.yaml

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+build:
+  python_version: "3.14"
+  python_requirements: requirements.txt
+
+  # Pin to the 0.17.0 RC SDK. Remove this line to use the default
+  # SDK version bundled with your cog CLI.
+  sdk_version: "0.17.0rc2"
+
+predict: "predict.py:Predictor"

examples/rc/predict.py

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+from cog import BasePredictor, Input
+
+
+class Predictor(BasePredictor):
+    def setup(self) -> None:
+        pass
+
+    def predict(self, text: str = Input(description="Input text")) -> str:
+        return text.upper()

examples/rc/requirements.txt

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+# Add your model dependencies here, e.g.:
+# torch==2.6.0
+# transformers