Add fast CI checks

[IlyaasK]

Summary

• Add a fast local Markdown link checker for tracked Markdown files.
• Add Terraform example validation using a locally built provider and dev_overrides, with no live API calls.
• Add the new checks to the release checklist.

Why this is v0 work

v0 needs CI to run on pull requests and main before tagging. The extra checks are small, credential-free validation gates for docs and examples, and they keep the provider releasable without broadening the runtime surface.

Intentionally unsupported in v0

• No acceptance tests run on ordinary PRs or push CI.
• No live API calls are made by example validation.
• No runtime/session Terraform operations are added.
• No v1 resources, force_destroy, or codegen work is included.

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Note

Low Risk
Changes only add CI/release validation scripts and workflow steps; no provider runtime, auth, or API behavior is modified.

Overview
Adds credential-free CI gates for docs and examples: a tracked-Markdown local link/image checker and Terraform validate for each examples/*/main.tf using a locally built provider via dev_overrides (no live API).

Wires both scripts into .github/workflows/ci.yml and documents them in docs/release.md, which now assumes a clean main checkout instead of naming a scaffold branch.

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There are 2 total unresolved issues (including 1 from previous review).

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[tnsardesai]

should be main?

[tnsardesai]

Nvm Saw the other PR with docs