Migrate from yarn to pnpm

[devin-ai-integration]

Summary

Migrates the package manager from yarn to pnpm. This replaces yarn.lock with pnpm-lock.yaml and updates the packageManager field to pnpm@9.15.4.

Changes:

• Updated packageManager field from yarn@1.22.22 to pnpm@9.15.4
• Removed yarn.lock
• Added pnpm-lock.yaml with resolved dependencies
• Updated CI workflow to use pnpm (install via pnpm/action-setup@v4, cache pnpm, run pnpm install --frozen-lockfile, pnpm build, pnpm test)

Updates since last revision

Added CI workflow changes to use pnpm instead of yarn. The workflow now installs pnpm via pnpm/action-setup@v4 and runs all commands with pnpm.

Review & Testing Checklist for Human

• Verify CI passed on this PR (confirms pnpm install, build, and test work in CI environment)
• Run pnpm install && pnpm build && pnpm test locally to confirm everything works
• Check if README or other docs reference yarn commands that should be updated to pnpm

Notes

This is the second PR in a stack of 2 (PR #12 was merged):

1. Pin dependencies (PR Pin all dependencies to exact versions #12) - Merged
2. This PR - Migrate from yarn to pnpm
3. Upgrade TypeScript to 5.9.2 (PR Upgrade TypeScript to 5.9.2 #14) - depends on this PR

Link to Devin run: https://app.devin.ai/sessions/430d7bdf45164595b92dfaa0b15d73d4
Requested by: @nick-fields

[devin-ai-integration]

Original prompt from nick@flux.ai

# Pin All Dependencies to Exact Versions in package.json

## Background
The `package.json` file in the `buildwithflux/kicad-module-parser` repository currently uses caret (`^`) ranges for most dependencies, which allow minor and patch version updates. We need to pin all dependencies to their exact versions based on what's currently installed in the `yarn.lock` file.

## Task
Review the `yarn.lock` file to determine the exact versions currently being used for all dependencies listed in `package.json`, then update `package.json` to pin these dependencies to those exact versions (removing the `^` prefix).

## Current State
In `package.json`, the following dependencies need to be updated:

**DevDependencies** (most use caret ranges):
- `@types/argparse: ^2.0.10`
- `@types/fs-extra: ^11.0.1`
- `@types/js-yaml: ^4.0.5`
- `@types/klaw: ^3.0.6`
- `@types/node: ^22.5.5`
- `@types/through2: ^2.0.41`
- `pegjs: ^0.10.0`
- `prettier: ^3.3.3`
- `prettier-plugin-pegjs: ^2.0.2`

Note: `npm-run-all: 4.1.5`, `tsup: 8.3.5`, `tsx: 4.19.1`, and `typescript: 5.6.2` are already pinned.

**Dependencies** (all use caret ranges):
- `ajv: ^8.6.2`
- `argparse: ^2.0.1`
- `chalk: ^5.3.0`
- `fs-extra: ^11.1.1`
- `js-yaml: ^4.1.0`
- `klaw: ^4.1.0`
- `through2: ^4.0.2`

## Steps
1. Open the `yarn.lock` file in the `buildwithflux/kicad-module-parser` repository
2. For each dependency listed above, find the exact version that's currently resolved in `yarn.lock`
3. Update `package.json` to replace the caret ranges with the exact version numbers (e.g., change `^8.6.2` to `8.6.2` or whatever exact version is in the lockfile)
4. Ensure all dependencies in both the `dependencies` and `devDependencies` sections are pinned to exact versions

## Files to Modify
- `buildwithflux/kicad-module-parser/package.json` - Update dependency version strings to remove `^` and use exact versions from yarn.lock

You only need to look in the following repo: buildwithflux/kicad-module-parser

[devin-ai-integration]

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