docs: correct stale unityVersion input description

[frostebite]

Summary

Found while investigating a community report (Discord) about a Unity 6000.6.x retry-cycle failure in a downstream user's workflow (MirrorNetworking/Mirror, which runs a matrix of unityVersion overrides against this action). While confirming their per-job unityVersion override still works correctly under the thin-wrapper (#310), I noticed the input's own description contradicts the code.

action.yml currently says:

A value other than "auto" for a full project is currently ignored - the underlying game-ci CLI always detects the version from the checked-out project and has no override flag yet.

That hasn't been true since #310. src/test-args.ts maps a non-"auto" unityVersion to an explicit --engineVersion=<value> CLI flag:

const unityVersion = getInput('unityVersion') || 'auto';
if (unityVersion !== 'auto') {
  args.push(`--engineVersion=${unityVersion}`);
}

and game-ci/cli's engine-detection middleware genuinely respects that as an override rather than clobbering it with auto-detection - covered by its own test, 'respects an explicit --engineVersion instead of overwriting it'.

As written, the description tells every reader that per-job version overrides don't work at all - which is exactly the pattern a CI matrix testing one project against several Unity versions relies on (Mirror's own use case). This PR only corrects the description text to match actual behavior; no code changes.

Test plan

• Confirmed the description was the only stale part - test-args.ts's mapping and the CLI's engine-detection override behavior were both already correct and already covered by existing tests
• yarn test - all 20 tests pass (unaffected, doc-only change)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Clarified that specifying a Unity version for a full project overrides the version detected from the checked-out project.
  • Documented that the selected version is passed to the underlying command-line tool as an explicit engine version override.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: d293960c-d95c-4999-a9a9-19e452d135c9

📥 Commits

Reviewing files that changed from the base of the PR and between 32e5771 and 8d92861.

📒 Files selected for processing (1)

• action.yml

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📝 Walkthrough

Walkthrough

The unityVersion input description now documents that non-auto values for full projects pass to the game-ci CLI as --engineVersion overrides.

Changes

Unity version documentation

Layer / File(s)	Summary
Document Unity version override behavior action.yml	The unityVersion description now states that a non-auto value overrides the Unity version detected from the project.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 8d928

The action input documentation now accurately describes the existing Unity version override behavior without changing runtime code or deployment behavior. No merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: correcting outdated documentation for the unityVersion input.
Description check	✅ Passed	The description clearly explains the documentation correction, provides relevant technical context, and documents the test plan. It does not use all template headings and does not include a successful…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/unity-version-input-doc

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