chore: shell-only build, drop gemma-4-e4b-it-4bit from Resources phase

Default release build is the empty-shell IPA — model files live under
Models/ for local development but are no longer copied into the .app
bundle. Users still download Gemma weights at first launch via the
in-app downloader (ModelScope / hf-mirror / huggingface.co fallback).

Keep PBXFileReference + group children so Models/ stays browsable in
Xcode, but remove the BuildFile entry from PBXResourcesBuildPhase.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PhoneClaw.xcodeproj/project.pbxproj

@@ -11,7 +11,6 @@
 		2F4A6C8E0A1B2C3D4E5F6071 /* AudioCaptureService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2F4A6C8E0A1B2C3D4E5F6070 /* AudioCaptureService.swift */; };
 		45B7FEC6C4D055F44A87BFA9 /* PhoneClawApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4DD9808FE93325C3CE4CFA00 /* PhoneClawApp.swift */; };
 		5084E1CD2E831BC05F5E4374 /* PromptBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2E7C06DA449D1395217A42D5 /* PromptBuilder.swift */; };
-		6A7B8C9D0E1F203142536475 /* gemma-4-e4b-it-4bit in Resources */ = {isa = PBXBuildFile; fileRef = D5E6F7081A2B3C4D5E6F7086 /* gemma-4-e4b-it-4bit */; };
 		9412304167DACB86E5D60D49 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = F5ED928BF14864713A9A9D16 /* ContentView.swift */; };
 		97E96A2FBFFAF609F276A896 /* ConfigurationsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E62C3CEFC7AE63873D751E75 /* ConfigurationsView.swift */; };
 		A31476EA2F856FD700318978 /* ChatAttachments.swift in Sources */ = {isa = PBXBuildFile; fileRef = A31476E82F856FD700318978 /* ChatAttachments.swift */; };
@@ -417,7 +416,6 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				6A7B8C9D0E1F203142536475 /* gemma-4-e4b-it-4bit in Resources */,
 				ICONASSETS0000000000002 /* Assets.xcassets in Resources */,
 				B1A2C3D4E5F607182930B100 /* Library in Resources */,
 			);