Separate preview builds from AWS publishing

[mdroidian]

PR builds currently run installation and extension code with AWS deployment credentials available. Split that flow into a credential-free dry build and a separate preview publisher, using the pattern already implemented in Pinned Blocks.

• Update pr.yaml to build and upload dist as a GitHub artifact with read-only repository permissions.
• Add pr-preview.yaml to publish successful same-repository PR artifacts to the existing exact-case and lowercase Samepage/S3 paths without checking out or executing PR code.
• Run builds for every PR targeting main, including configuration-only changes, and isolate publisher concurrency by source repository and branch.
• Lowercase full object keys, including filenames, while retaining exact-case uploads.
• Preserve Presentation's npm install: the existing lockfile causes npm ci to fail with an Android-only esbuild dependency.

Validation: local dependency installation, samepage build --dry (0 errors), actionlint, Prettier, and git diff --check pass. Local installation used --package-lock=false to preserve the existing lockfile. A mocked AWS invocation test also passes for mixed-case filenames, nested paths, spaces, and an already-lowercase destination prefix; trigger/concurrency assertions pass. No real upload was performed. The privileged upload requires a post-merge check because GitHub activates workflow_run from the default branch.

This PR contains only the two preview workflows and is independent of the Craft compatibility PR #16. Production publishing is unchanged.

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Reviewing files that changed from the base of the PR and between 3825961 and 5c7d5ec.

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• .github/workflows/pr-preview.yaml
• .github/workflows/pr.yaml

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-13T19:50:42.536894Z	5c7d5ec	New commits

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