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AGENTS.md

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+# Repository Guidelines
+
+## Scope
+
+This file is for AI coding agents working in this repository. Optimize for minimal, correct changes that preserve the shared client/server networking architecture.
+
+## Workspace Rules
+
+- Use LF line endings in files you create or edit.
+- Do not introduce `UnityEngine` dependencies into shared networking code under `Assets/Scripts/Network/`.
+- Keep Unity-only adapters and conversion helpers under `Assets/Scripts/Extensions/` or other host-specific locations.
+- Do not revert unrelated user changes in the worktree.
+
+## Project Layout
+
+- `Assets/Scripts/Network/`: shared transport, message routing, session lifecycle, and host adapters.
+- `Assets/Scripts/Extensions/`: Unity-specific helpers such as protobuf-to-Unity conversions.
+- `Assets/Tests/EditMode/Network/`: NUnit edit-mode regression tests.
+- `openspec/`: specs, active changes, and archived changes.
+
+## Commands
+
+- `dotnet build Network.EditMode.Tests.csproj -v minimal`
+  Build runtime and edit-mode test assemblies.
+- `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`
+  Run the CLI regression suite.
+- `openspec status --change "<name>"`
+  Check change progress.
+- `openspec instructions apply --change "<name>" --json`
+  Read current implementation tasks before editing code.
+
+If needed, set `DOTNET_CLI_HOME=.dotnet-home` and `DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1`.
+
+## Code Change Guidance
+
+- Follow existing C# style: 4-space indentation, `PascalCase` for public APIs, `_camelCase` for private fields.
+- Prefer focused types. Keep `SessionManager` single-session; use coordinators such as `MultiSessionManager` for per-peer collections.
+- Preserve the client single-session path unless the task explicitly changes it.
+- Treat `network-main-thread-dispatch` as client-only. Shared/server work should align with `shared-network-foundation`, `network-session-lifecycle`, and `multi-session-lifecycle`.
+
+## Testing Expectations
+
+- Add or update NUnit tests with every network-layer behavior change.
+- Cover both client single-session and server multi-session behavior when touching lifecycle code.
+- Prefer explicit regression-style test names such as `Method_Scenario_ExpectedBehavior`.
+- Do not finish a networking change without running `dotnet test` unless blocked.
+
+## OpenSpec Workflow
+
+- For substantial work: propose, apply, verify, then archive.
+- Sync delta specs to `openspec/specs/` before archive when requirements changed.
+- Keep implementation aligned with active change artifacts; update task checkboxes as work completes.