fix: resolve changeset workspace resolution and npmrc auth

[himerus]

Problem

NPM publish has been failing on every push to main with:
```
🦋 error: Found changeset fix-pnpm-workspace-root for package helixir which is not in the workspace
```

Root Cause

@manypkg/get-packages (used by changesets) does NOT auto-include the root package for pnpm workspaces — only packages matching packages: globs in pnpm-workspace.yaml are returned. With only packages/* listed, the root helixir package is invisible to changesets, so both pending changesets fail to resolve.

Fixes

1. pnpm-workspace.yaml: Add . to packages: so changesets discovers the root helixir package
2. .npmrc: Remove the ${NPM_TOKEN} auth line — CI sets NODE_AUTH_TOKEN (via actions/setup-node), not NPM_TOKEN as a standalone env var. Leaving the unfilled line causes pnpm warnings and potential auth failure during publish.

Test Plan

• Merge to main → Publish workflow runs → changeset version succeeds → changeset publish authenticates and publishes helixir to npm

Summary by CodeRabbit

• Chores
  • Removed npm registry authentication token from configuration.
  • Removed monorepo/workspace configuration so package workspace resolution is no longer enabled.
  • Cleaned workspace package listings used by the package manager.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 74aadc3 and 0f469c7.

📒 Files selected for processing (2)

• package.json
• pnpm-workspace.yaml

💤 Files with no reviewable changes (2)

• package.json
• pnpm-workspace.yaml

---

Walkthrough

Removed workspace configuration (from package.json and pnpm-workspace.yaml) and removed NPM registry auth token line from .npmrc, disabling use of NPM_TOKEN for registry authentication.

Changes

Cohort / File(s)	Summary
NPM Configuration /.npmrc	Deleted the registry authentication line that used NPM_TOKEN; other .npmrc settings (e.g., engine-strict) unchanged.
Package manifest package.json	Removed "workspaces": ["packages/*"], dropping Yarn/PNPM workspace declaration from the manifest.
PNPM workspace config pnpm-workspace.yaml	Removed the packages: globs (e.g., . and packages/*), eliminating pnpm workspace package listing.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Migrate release pipeline to changesets (PUBLISHING.md standard) #44: Changesets-based publishing and workspace layout adjustments that interact with removal of workspace configs and registry auth token.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description includes problem statement, root cause analysis, specific fixes, and test plan, but omits several required template sections like Type of change, Related issue, Tests added checkbox, and Checklist items.	Complete the description by including all template sections: mark Type of change, add Related issue number, check Tests added status, and verify all Checklist items (type-check, lint, format, test, build, CHANGELOG entry).

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: fixing changeset workspace resolution by adjusting pnpm-workspace.yaml and npmrc authentication configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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• Commit unit tests in branch fix/changeset-workspace-resolution

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