fix(wasm): preserve simultaneous AI proposals

[matthewevans]

Preserves one bounded proposal token per semantic owner so simultaneous mulligan decisions cannot invalidate one another. A successful interaction still invalidates every token because the state revision changes.

Summary by CodeRabbit

• Bug Fixes
  • Improved simultaneous proposal handling so concurrent proposals from different owners are preserved.
  • Ensured each owner retains only one active proposal token.
  • Updated mulligan handling to support independent proposals and successful submission.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: 76fe423e-6a93-4f2b-9179-b530edc61cef

📥 Commits

Reviewing files that changed from the base of the PR and between e6c6bb0 and 7ee00dd.

📒 Files selected for processing (1)

• crates/engine-wasm/src/lib.rs

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📝 Walkthrough

Walkthrough

AI proposal insertion now replaces only proposals for the same semantic owner. Concurrent proposals for different owners remain available. The simultaneous-mulligan test verifies proposal retention and successful application.

Changes

AI proposal ownership

Layer / File(s)	Summary
Owner-scoped replacement and concurrent mulligan validation crates/engine-wasm/src/lib.rs	AiProposalRegistry::insert retains proposals for different semantic owners while superseding the incoming owner’s prior proposal. The simultaneous-mulligan test verifies that both owners’ proposals remain live and that the first owner’s proposal applies successfully.

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

Suggested reviewers: mike-thedude, parthmishra, davion-knight

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the change to preserve simultaneous AI proposals in WASM.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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/ai-proposal-owner-scope

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