feat: add prek pre-commit hooks and dependabot (#1720)

* feat: add prek pre-commit hooks and dependabot

Pre-commit hooks (via prek):
- Basic hygiene: trailing-whitespace, end-of-file-fixer, check-yaml, check-added-large-files, check-merge-conflict
- Security: detect-secrets, zizmor (GitHub Actions audit)
- Linting: shellcheck, actionlint, oxlint, swiftlint
- Formatting: oxfmt, swiftformat

Dependabot:
- npm and GitHub Actions ecosystems
- Grouped updates (production/development/actions)
- 7-day cooldown for supply chain protection

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* docs: add prek install instruction to AGENTS.md

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

apps/android/app/src/main/java/com/clawdbot/android/CameraHudState.kt

@@ -12,4 +12,3 @@ data class CameraHudState(
   val kind: CameraHudKind,
   val message: String,
 )
-

apps/android/app/src/main/java/com/clawdbot/android/VoiceWakeMode.kt

@@ -12,4 +12,3 @@ enum class VoiceWakeMode(val rawValue: String) {
     }
   }
 }
-

apps/android/app/src/main/java/com/clawdbot/android/node/SmsManager.kt

@@ -135,7 +135,7 @@ class SmsManager(private val context: Context) {
 
     /**
      * Send an SMS message.
-     * 
+     *
      * @param paramsJson JSON with "to" (phone number) and "message" (text) fields
      * @return SendResult indicating success or failure
      */

apps/android/app/src/main/res/values/colors.xml

@@ -1,4 +1,3 @@
 <resources>
     <color name="ic_launcher_background">#0A0A0A</color>
 </resources>
-

apps/android/app/src/main/res/values/strings.xml

@@ -1,4 +1,3 @@
 <resources>
     <string name="app_name">Clawdbot Node</string>
 </resources>
-

apps/android/app/src/test/java/com/clawdbot/android/voice/VoiceWakeCommandExtractorTest.kt

@@ -23,4 +23,3 @@ class VoiceWakeCommandExtractorTest {
     assertNull(VoiceWakeCommandExtractor.extractCommand("hey claude!", listOf("claude")))
   }
 }
-

apps/android/settings.gradle.kts

@@ -16,4 +16,3 @@ dependencyResolutionManagement {
 
 rootProject.name = "ClawdbotNodeAndroid"
 include(":app")
-