chore: bump pnpm to 12.4.1

[btravers]

Bumps packageManager from pnpm 11.7.0 to 12.4.1 (major).

• Lockfile regenerated with pnpm install --lockfile-only: the only change is pnpm 12's new packageManagerDependencies document pinning pnpm's own integrity. Dependency graph unchanged.
• pnpm 12 breaking changes to watch in CI: unrecognized pnpm-workspace.yaml settings now error, --frozen-lockfile false removed (use --no-frozen-lockfile), stricter engineStrict.

https://claude.ai/code/session_01JqjTCSDPsbgreJKHcRABi9

[Copilot]

🟡 Changes recommended

The updated pnpm-lock.yaml is structured as multiple YAML documents (duplicated ---/root keys), which can break pnpm’s lockfile parsing and installs.

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Pull request overview

Updates the repository’s toolchain to pnpm 12.4.1 by changing the packageManager pin and regenerating the pnpm lockfile so installs use the newer pnpm major version.

Changes:

• Bump packageManager in package.json from pnpm 11.7.0 to pnpm 12.4.1.
• Update pnpm-lock.yaml with pnpm 12 metadata (including pnpm’s self-pin/integrity information).

File summaries

File	Description
package.json	Updates the pnpm version pin used by Corepack/tooling.
pnpm-lock.yaml	Regenerated lockfile content intended to reflect pnpm 12’s lockfile structure.

Review details

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

• Files reviewed: 1/2 changed files
• Comments generated: 1
• Review effort level: Lite

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