Migrated SDK workspace to pnpm (PLA-322)

[9larsons]

What changed

• replaced Yarn Classic with an integrity-pinned pnpm 10.34.5 workspace and verified pnpm-lock.yaml
• enabled the supply-chain baseline: minimumReleaseAge: 4320, strictDepBuilds: true, and blockExoticSubdeps: true
• explicitly denied the currently detected dependency build scripts; there are no true build approvals
• converted package lifecycle scripts, Lerna, developer docs, and repository metadata to pnpm
• replaced the Yarn-only reusable test workflow with an equivalent local Node 20/22 pnpm matrix
• migrated the publish workflow to frozen pnpm installs while preserving npm OIDC, provenance, independent package versioning, build-artifact commits, and Lerna's from-package release flow
• declared build-time dependencies that Yarn hoisting had supplied implicitly

Why

This brings SDK onto the pnpm supply-chain baseline tracked by PLA-322 and makes dependency lifecycle execution reviewable and deny-by-default.

Validation

• pnpm install --frozen-lockfile
• pnpm lint
• pnpm test (all 17 packages)
• pnpm build
• individual pnpm publish --dry-run --no-git-checks for all 17 packages
• NPM_CONFIG_DRY_RUN=true pnpm ship:ci
• actionlint
• JSON/YAML parsing and git diff --check

The exact Lerna publish dry-run completed successfully with no unpublished packages detected.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e050d68) to head (4af4a24).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1041   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           30        30           
  Lines         3060      3060           
  Branches       459       459           
=========================================
  Hits          3060      3060           

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