diff --git a/.cursor/rules/architecture-authority.mdc b/.cursor/rules/architecture-authority.md
similarity index 100%
rename from .cursor/rules/architecture-authority.mdc
rename to .cursor/rules/architecture-authority.md
diff --git a/.cursor/rules/csharp-style.mdc b/.cursor/rules/csharp-style.md
similarity index 100%
rename from .cursor/rules/csharp-style.mdc
rename to .cursor/rules/csharp-style.md
diff --git a/.cursor/rules/gdscript-style.mdc b/.cursor/rules/gdscript-style.md
similarity index 100%
rename from .cursor/rules/gdscript-style.mdc
rename to .cursor/rules/gdscript-style.md
diff --git a/.cursor/rules/git-workflow.mdc b/.cursor/rules/git-workflow.md
similarity index 100%
rename from .cursor/rules/git-workflow.mdc
rename to .cursor/rules/git-workflow.md
diff --git a/.cursor/rules/story-kickoff.mdc b/.cursor/rules/story-kickoff.md
similarity index 97%
rename from .cursor/rules/story-kickoff.mdc
rename to .cursor/rules/story-kickoff.md
index eed6bcd..3588999 100644
--- a/.cursor/rules/story-kickoff.mdc
+++ b/.cursor/rules/story-kickoff.md
@@ -24,7 +24,7 @@ When the user starts work on a **Jira story** (e.g. issue key `NS-14`, phrases l
 ## 4. Planning document
 
 - Add **`docs/plans/{JIRA_KEY}-implementation-plan.md`** (example: `docs/plans/NS-14-implementation-plan.md`). Create `docs/plans/` if it does not exist.
-- Prefer committing this plan on **`main`** so it exists even before a feature branch; it counts as documentation-style work per [git workflow](git-workflow.mdc).
+- Prefer committing this plan on **`main`** so it exists even before a feature branch; it counts as documentation-style work per [git workflow](git-workflow.md).
 
 **Required sections** in that file:
 
@@ -39,4 +39,4 @@ When the user starts work on a **Jira story** (e.g. issue key `NS-14`, phrases l
 
 ## 5. After the plan
 
-- Implement only after the user confirms. For code, scenes, data, or CI changes, use a **branch** and follow [git workflow](git-workflow.mdc).
+- Implement only after the user confirms. For code, scenes, data, or CI changes, use a **branch** and follow [git workflow](git-workflow.md).
diff --git a/.cursor/rules/testing-expectations.mdc b/.cursor/rules/testing-expectations.md
similarity index 99%
rename from .cursor/rules/testing-expectations.mdc
rename to .cursor/rules/testing-expectations.md
index dba88b1..2ac2742 100644
--- a/.cursor/rules/testing-expectations.mdc
+++ b/.cursor/rules/testing-expectations.md
@@ -27,4 +27,4 @@ alwaysApply: true
 ## Cross-cutting
 
 - If **CI** is added later, treat its **required** steps (e.g. `dotnet test`, schema validation) as gates: fix failures or update workflows/docs intentionally—do not silence checks without a recorded reason.
-- When a story is **explicitly client-only or spike** (no server), match that scope in tests too (manual client checks only), and call out temporariness per [architecture authority](architecture-authority.mdc).
+- When a story is **explicitly client-only or spike** (no server), match that scope in tests too (manual client checks only), and call out temporariness per [architecture authority](architecture-authority.md).