chore: add default resources, auth/encryption config, and improve docs

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]

CONTRIBUTING.md

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+# Contributing
+
+## Local Development
+
+### Prerequisites
+
+- [Helm 3.x](https://helm.sh/docs/intro/install/)
+- A local Kubernetes cluster (e.g., [minikube](https://minikube.sigs.k8s.io/docs/start/)). The default resource requests require at least 12GB of memory. For minikube, configure this before creating your cluster:
+  ```bash
+  minikube config set memory 12288  # 12GB
+  ```
+
+### Building Dependencies
+
+Fetch the subchart dependencies (PostgreSQL, Valkey). You only need to re-run this when the dependencies in `Chart.yaml` are updated:
+
+```bash
+helm dependency build ./charts/sourcebot
+```
+
+### Deploying Locally
+
+Apply the secrets and deploy the minimal installation example:
+
+```bash
+kubectl apply -f examples/minimal-installation/secrets.yaml
+helm upgrade --install sourcebot ./charts/sourcebot \
+  -f examples/minimal-installation/values.yaml \
+  --set-json "sourcebot.config=$(cat examples/minimal-installation/config.json)"
+```
+
+Port forward to access Sourcebot at http://localhost:3000:
+
+```bash
+kubectl port-forward svc/sourcebot 3000:3000
+```
+
+### Validating Changes
+
+Lint the chart:
+
+```bash
+helm lint ./charts/sourcebot -f ./charts/sourcebot/values.lint.yaml
+```
+
+Render templates locally without deploying:
+
+```bash
+helm template sourcebot ./charts/sourcebot -f ./charts/sourcebot/values.lint.yaml
+```
+
+Run the chart tests:
+
+```bash
+helm test sourcebot
+```
+
+### Updating Docs
+
+The chart README is auto-generated from `values.yaml` comments using [helm-docs](https://github.com/norwoodj/helm-docs). After modifying `values.yaml`, regenerate the docs:
+
+```bash
+helm-docs --chart-search-root ./charts
+```