fix(publish): pin npm to 11.5.1 for OIDC trusted publishing

[himerus]

Root cause

helixir@0.6.1 failed to publish with a misleading E404 'not in this registry'. Root cause: the publish job ran with npm 10.9.7 (Node 22 bundled), which cannot do OIDC trusted publishing. pnpm publish shells out to npm for the registry PUT, so npm version matters. The TP entry and OIDC token were correct; npm 10.9.7 just can't authenticate and returns 404 (npm/cli#8976).

Fix

Add npm install -g npm@11.5.1 --force after setup-node. Matches the working pattern from discord-ops and create-helix (both shipped via TP).

Publish flow

0.6.1 is already bumped on main (unpublished). Merging re-triggers the publish workflow → publishes 0.6.1 with the working npm. No new changeset needed.

Test plan

• Merge → publishes helixir@0.6.1 via OIDC
• npm view helixir@0.6.1 shows version + provenance attestation

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ℹ️ Review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b8b6d4 and 60d1ca1.

📒 Files selected for processing (1)

• .github/workflows/publish.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/pin-npm-1151

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