chore: add README describing the purpose of pl-model-common package

[DenKoren]

Greptile Summary

This PR adds a README.md to the lib/model/common package explaining its purpose as a shared primitives layer that must work across all execution contexts (Node, QuickJS sandbox, browser, browser preload).

• README added: Documents the package's role as a context-agnostic meeting point for shared code, with explicit warnings against introducing context-dependent code or unnecessary dependencies.
• Empty changeset: .changeset/major-clocks-cheer.md contains no version bump entries, which is correct for a documentation-only change.

Confidence Score: 5/5

Documentation-only change with no code modifications — safe to merge.

Both files are purely additive documentation. The README accurately describes the package's constraints, and the empty changeset correctly signals no version bump is needed.

No files require special attention.

Important Files Changed

Filename	Overview
lib/model/common/README.md	New README describing the package's purpose, constraints, and supported execution contexts — minor typo ("wether" → "whether") on the last bullet.
.changeset/major-clocks-cheer.md	Empty changeset (no version bumps), appropriate for a documentation-only change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[pl-model-common] -->|shared primitives| B[Node context]
    A -->|shared primitives| C[QuickJS sandbox]
    A -->|shared primitives| D[Browser context]
    A -->|shared primitives| E[Browser preload]
    style A fill:#f0f4ff,stroke:#4a6cf7

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Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
lib/model/common/README.md:14
Typo: "wether" should be "whether".

```suggestion
- Keep list of dependencies limited and clear. Each new dependency is a moment to think whether you really need it.
```

_{Reviews (1): Last reviewed commit: "chore: add README describing the purpose..." | Re-trigger Greptile}

Greptile also left 1 inline comment on this PR.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3b9eecb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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[gemini-code-assist]

Code Review

This pull request introduces a README for the lib/model/common package, clarifying its purpose as a shared repository for primitives and functions across multiple execution contexts. It also adds a changeset file. The review feedback suggests populating the empty changeset file with the required package information and description, and provides several corrections for grammatical errors and typos within the new README documentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.60%. Comparing base (8fdd29c) to head (3b9eecb).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1646      +/-   ##
==========================================
+ Coverage   53.42%   53.60%   +0.17%     
==========================================
  Files         267      267              
  Lines       15466    15471       +5     
  Branches     3317     3320       +3     
==========================================
+ Hits         8263     8293      +30     
+ Misses       6106     6080      -26     
- Partials     1097     1098       +1     

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