Upgrade pnpm supply-chain safeguards

[JoviDeCroock]

Summary

• upgrade pinned pnpm usage to pnpm 11
• configure a 7-day minimumReleaseAge window for installs
• explicitly block exotic transitive dependencies

Why

Upgraded every repo to pnpm 11, so we inherit the ecosystem install-cooldown behaviour. It's not a fix on its own. It buys us a window.

Testing

• Not run; config-only change.

[changeset-bot]

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Latest commit: 35a00dd

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