tooling: Auto-sync driver examples to micropython-steami-sample on release.

[nedseb]

What

Add an automatic sync job that copies all driver examples from lib/*/examples/*.py into a drivers/ directory in steamicc/micropython-steami-sample after each release.

Why

Driver examples live in this repo (close to the code they validate) but students look for examples in micropython-steami-sample. Currently there is no link between the two repos — the 94 example files across 15 drivers are invisible to students unless they browse this repo directly.

How

1. Create scripts/sync_examples.sh

A simple shell script that:

• Takes a version string and a target directory as arguments
• Deletes <target>/drivers/ and recreates it from lib/*/examples/*.py
• Generates a drivers/README.md with the version and a "do not edit" notice

2. Add a sync-examples job to .github/workflows/release.yml

After semantic-release publishes a new version:

1. Checkout this repo at the release tag
2. Checkout micropython-steami-sample
3. Run scripts/sync_examples.sh
4. Commit and push to micropython-steami-sample

Uses the same GitHub App token already configured for semantic-release.

3. Update CONTRIBUTING.md

Short mention of the sync mechanism so contributors know their examples will propagate to the sample repo.

Blocked by

• chore: Rename directories from UPPERCASE to lowercase. micropython-steami-sample#6 (rename directories to lowercase — so drivers/ is consistent)
• tooling: Add ruff linting and CI workflow. micropython-steami-sample#7 (CI/lint — so synced files pass the new quality gate)

Verification

Run scripts/sync_examples.sh v0.23.1 /tmp/sample-test locally and verify the drivers/ directory contains all expected files.