Fix native multi-AI setup frame limit

[matthewevans]

Fixes native Play vs AI falling back to WASM when 3+ seats make the CreateGameWithSettings frame exceed the old 8 KiB WebSocket limit.\n\nRaises the bounded frame limit to 64 KiB and adds a WebSocket integration regression for a 3-seat AI setup frame larger than 8 KiB.

Summary by CodeRabbit

• Bug Fixes
  • Increased the maximum WebSocket message size from 8 KB to 64 KB.
  • Native Play-vs-AI game setup messages larger than 8 KB can now be transmitted and validated successfully.
  • Added regression coverage for larger game-creation requests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 24a9edcf-ba92-4db4-b252-5d5b2785f387

📥 Commits

Reviewing files that changed from the base of the PR and between 40a36f6 and ea8e6d5.

📒 Files selected for processing (1)

• crates/phase-server/src/main.rs

---

📝 Walkthrough

Walkthrough

The WebSocket message limit increases from 8 KB to 64 KB. A full-mode regression test constructs an oversized native multi-AI game-creation request and verifies it passes framing before receiving the expected validation error.

Changes

WebSocket message limit

Layer / File(s)	Summary
Increase WebSocket payload limit crates/phase-server/src/main.rs	Raises the WebSocket frame payload limit to 64 KB and updates the adjacent comment.
Validate oversized create requests crates/phase-server/src/main.rs	Adds AI protocol imports, a large-deck helper, and a regression test confirming an 8–64 KB CreateGameWithSettings request reaches server validation.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: parthmishra, realdiligent

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: increasing the native multi-AI setup frame limit.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ship/fix-native-multi-ai-frame

---

_{Comment @coderabbitai help to get the list of available commands.}