Add plan.md cleanup to Canvas App skills (#84)

Agent-Logs-Url: https://github.com/microsoft/power-platform-skills/sessions/5100f56e-6ef3-4329-b34e-9a99e6abb785

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lesaltzm <69215460+lesaltzm@users.noreply.github.com>

Author: Copilot

plugins/canvas-apps/skills/edit-canvas-app/SKILL.md

@@ -200,6 +200,9 @@ Track how many `compile_canvas` passes were needed.
 
 ## Phase 6 — Summary
 
+Delete `canvas-edit-plan.md` from the working directory using `Bash`:
+`rm <working-directory>/canvas-edit-plan.md`
+
 Present a final summary:
 
 > **Edit complete.**

plugins/canvas-apps/skills/generate-canvas-app/SKILL.md

@@ -123,6 +123,9 @@ Track how many `compile_canvas` passes were needed.
 
 ## Phase 4 — Summary
 
+Delete `canvas-app-plan.md` from the working directory using `Bash`:
+`rm <working-directory>/canvas-app-plan.md`
+
 Present a final summary:
 
 > **App generation complete.**