refactor: clean CLI taxonomy — canonical subcommands, merged memory.update, no aliases

- calendar: split write → create/read/update/delete/share
- contacts: rename lookup → read
- memory: merge write+forget → update (unified action field in operations)
- Remove all alias/normalization logic from adapter and handlers
- Update tool_postprocessor ui_hints builders to canonical keys
- Remove frontend legacy TOOL_CALL_START/ARGS/END events and ToolCallItem
- Update SKILL.md files and protocol docs
- Update tests and settings screens

apps/android/app/build.gradle.kts

@@ -52,10 +52,9 @@ android {
 
     buildTypes {
         release {
-            if (!keystorePropertiesFile.exists()) {
-                throw GradleException("Missing apps/android/key.properties for release signing")
+            if (keystorePropertiesFile.exists()) {
+                signingConfig = signingConfigs.getByName("release")
             }
-            signingConfig = signingConfigs.getByName("release")
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro",