fix(coding-agent): preserved prompted paused plan commands

Kept /plan <prompt> from paused plan mode on the prompted entry path while retaining the no-arg third-toggle exit.

Added regression coverage for paused plan mode resuming and submitting the prompt.

Fixes #2510

packages/coding-agent/CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Fixed
 
-- Fixed `/plan` cycling between `plan` and `plan_paused` with no path back to mode `none`. `handlePlanModeCommand` had branches for entering and pausing but fell through to `#enterPlanMode()` when invoked from the paused state, so once a session entered plan mode the only operator-visible toggle re-entered it. The handler now matches `planModePaused` and fully exits — clearing `planModeHasEntered` and appending a `mode_change` to `"none"` — so `/goal` (and any other mode gated on `planModeEnabled || planModePaused`) can run again after a third `/plan` ([#2510](https://github.com/can1357/oh-my-pi/issues/2510)).
+- Fixed `/plan` cycling between `plan` and `plan_paused` with no path back to mode `none`, while preserving prompted paused-mode requests. The no-arg third toggle now fully exits — clearing `planModeHasEntered` and appending a `mode_change` to `"none"` — and `/plan <prompt>` from `plan_paused` re-enters plan mode and submits the prompt as the first turn ([#2510](https://github.com/can1357/oh-my-pi/issues/2510)).
 
 ## [15.12.5] - 2026-06-13
 ### Changed

packages/coding-agent/src/modes/interactive-mode.ts

@@ -2237,12 +2237,12 @@ export class InteractiveMode implements InteractiveModeContext {
 			await this.#exitPlanMode({ paused: true });
 			return;
 		}
-		if (this.planModePaused) {
-			// Third toggle: paused → off. Tools, model, and plan state were already
-			// restored by the prior #exitPlanMode({ paused: true }); only the
+		if (this.planModePaused && !initialPrompt) {
+			// No-arg third toggle: paused → off. Tools, model, and plan state were
+			// already restored by the prior #exitPlanMode({ paused: true }); only the
 			// paused flag, the reentry marker, and the session mode entry remain.
-			// Without this branch the handler fell through to #enterPlanMode and
-			// the session was stuck cycling plan ↔ plan_paused (issue #2510).
+			// Prompted /plan invocations fall through to #enterPlanMode below so the
+			// supplied prompt is still submitted as the first plan-mode turn.
 			this.planModePaused = false;
 			this.#planModeHasEntered = false;
 			this.#updatePlanModeStatus();

packages/coding-agent/test/interactive-mode-resume-mode.test.ts

@@ -212,6 +212,26 @@ describe("InteractiveMode resume mode restoration", () => {
 		expect(created.session.getActiveToolNames()).toContain("resolve");
 	});
 
+	it("submits prompted plan commands when plan mode is paused", async () => {
+		const created = await createHarness();
+		await created.mode.handlePlanModeCommand();
+		await created.mode.handlePlanModeCommand();
+		expect(created.mode.planModeEnabled).toBe(false);
+		expect(created.mode.planModePaused).toBe(true);
+
+		let submittedText: string | undefined;
+		created.mode.onInputCallback = input => {
+			submittedText = input.text;
+		};
+
+		await created.mode.handlePlanModeCommand("write the plan");
+
+		expect(created.mode.planModeEnabled).toBe(true);
+		expect(created.mode.planModePaused).toBe(false);
+		expect(created.session.getPlanModeState()).toMatchObject({ enabled: true });
+		expect(submittedText).toBe("write the plan");
+	});
+
 	it("clears stale plan mode state when switching to a non-plan session", async () => {
 		const registry = modelRegistry();
 		const defaultModel = modelOrThrow(registry, "claude-sonnet-4-5");