chore: ignore local agent state, clean packaged installers

.gitignore: add .omo/ (an AI-assisted-coding local state dir that was being
tracked — .omo/run-continuation/*.json is session scratch, not source) and
/plan.md (local working notes).

make clean: also remove cmd/build/ and cmd/gui/dist/. Those hold the packaged
installers (1.8 GB and 386 MB on this machine) and were never cleaned, so
`make clean` left almost all of the build output behind.

.gitignore

@@ -16,8 +16,12 @@ cmd/gui/*.log
 .pi/
 .pi-glla/
 .codegraph/
+.omo/
 /build/
 
 # local ops scripts (machine-specific, not for sharing)
 scripts/
 cmd/gui/dist/
+
+# local design/working notes (not part of the shipped repo)
+/plan.md

.omo/run-continuation/ses_fcda7f5e1ffe9g78A7lVoLMxn7.json

@@ -1,10 +0,0 @@
-{
-  "sessionID": "ses_fcda7f5e1ffe9g78A7lVoLMxn7",
-  "updatedAt": "2026-08-24T11:19:43.949Z",
-  "sources": {
-    "background-task": {
-      "state": "idle",
-      "updatedAt": "2026-08-24T11:19:43.949Z"
-    }
-  }
-}

Makefile

@@ -56,7 +56,7 @@ test:
 	go test ./...
 
 clean:
-	rm -rf $(BUILD_DIR) cmd/gui/build/gui-dist cmd/gui/bin
+	rm -rf $(BUILD_DIR) cmd/build cmd/gui/dist cmd/gui/build/gui-dist cmd/gui/bin
 
 help:
 	@echo "Targets:"
@@ -68,3 +68,4 @@ help:
 	@echo "  make gui-win    build Windows nsis (needs host mingw + wine)"
 	@echo "  make gui-win-docker  build Windows nsis all-in-docker (no host mingw needed)"
 	@echo "  make test       run go tests"
+	@echo "  make clean      remove build dirs and packaged installers (build/, cmd/build/, cmd/gui/dist/)"