feat: add pause point capture modes and history

[hatayama]

Summary

This Phase 1 base branch adds continuous and trace capture modes plus bounded pause point hit history.

• Add single-shot, continuous, and trace capture modes while preserving single-shot as the default.
• Retain bounded captured-variable history with hit sequence, frame count, timestamp, truncation, and dropped-frame metadata.
• Expose mode/history through enable-pause-point and pause-point-status, including validation and shared C#/Go response contracts.
• Add await-pause-point contract coverage, CLI schema guidance, and the source pause-point skill documentation with regenerated copies.

Validation

• Unity compile: 0 errors, 0 warnings.
• Targeted Unity tests: 58/58 passed.
• scripts/check-go-cli.sh: passed.
• Continuous E2E: an Update line in SimulateMouseDemoScene was hit, then three Editor Steps grew history from four consecutive frames.
• Trace E2E: playback continued without pause; 372 hits were recorded with a five-frame history and 367 dropped frames.
• Single-shot E2E: the first hit paused Unity, recorded one history frame, and auto-disarmed.
• The checkout has no dedicated jumping-ball scene, so the equivalent Update-path behavior was verified in SimulateMouseDemoScene using dist/darwin-arm64/uloop directly; no PATH-resolved uloop was used.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: ab5f9cea-477f-4f89-b5cb-af4be04ad502

📥 Commits

Reviewing files that changed from the base of the PR and between 7318b9d and 7b29d36.

⛔ Files ignored due to path filters (4)

• Assets/Tests/Editor/PausePointCaptureModeTests.cs.meta is excluded by none and included by none
• Assets/Tests/Editor/PausePointToolModeTests.cs.meta is excluded by none and included by none
• Packages/src/Runtime/PausePoints/UloopPausePointCaptureMode.cs.meta is excluded by none and included by none
• Packages/src/Runtime/PausePoints/UloopPausePointCapturedHistoryFrame.cs.meta is excluded by none and included by none

📒 Files selected for processing (19)

• .agents/skills/uloop-pause-point/SKILL.md
• .claude/skills/uloop-pause-point/SKILL.md
• Assets/Tests/Editor/PausePointCaptureModeTests.cs
• Assets/Tests/Editor/PausePointStatusResponseContractTests.cs
• Assets/Tests/Editor/PausePointToolModeTests.cs
• Assets/Tests/Editor/SourcePausePointCapture/SourcePausePointCaptureTests.cs
• Packages/src/Editor/CliOnlyTools~/PausePoint/Skill/SKILL.md
• Packages/src/Editor/FirstPartyTools/PausePoint/PausePointTools.cs
• Packages/src/Editor/Infrastructure/Api/PausePointStatusBridgeCommand.cs
• Packages/src/Runtime/PausePoints/UloopPausePointCaptureMode.cs
• Packages/src/Runtime/PausePoints/UloopPausePointCapturedHistoryFrame.cs
• Packages/src/Runtime/PausePoints/UloopPausePointEntry.cs
• Packages/src/Runtime/PausePoints/UloopPausePointRegistry.cs
• Packages/src/Runtime/PausePoints/UloopPausePointSnapshot.cs
• cli/common/tools/default-tools.json
• cli/project-runner/internal/projectrunner/pause_point_types.go
• cli/project-runner/internal/projectrunner/pause_point_wait.go
• cli/project-runner/internal/projectrunner/pause_point_wait_test.go
• tests/contracts/pause_point_status_response_contract.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/pause-point-capture-modes

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