rename: Jarvis -> Jervis target, scheme, and folder throughout

The bundle-ID and display-name renames weren't enough — the actual
Xcode target/product name was still "Jarvis", which drives CFBundleName,
Xcode's Organizer archive list, the .xcodeproj filename, and the scheme
name. Renamed all the way through:

- project.yml: top-level name, target key, PRODUCT_NAME, source/info paths
- Jarvis/ -> Jervis/ (source folder, git-tracked as renames, no content
  diffs on the moved files)
- .gitignore, CI workflows, README, CONTRIBUTING: Jarvis.xcodeproj /
  scheme Jarvis -> Jervis.xcodeproj / scheme Jervis

Verified: xcodebuild -scheme Jervis succeeds, produces Jervis.app,
CFBundleName/CFBundleExecutable/CFBundleDisplayName all read "Jervis".
CFBundleIdentifier intentionally stays com.kisani.jarvis (per prior
decision — bundle ID isn't user-facing anywhere including Organizer).

Swift type names (JarvisApp, JarvisWordmark, etc.) and the Gitea repo
name/URL are unchanged — pure internal source identifiers, not user or
developer-facing product identity.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jervis/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,14 @@
+{
+  "images" : [
+    {
+      "filename" : "AppIcon.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}