refactor: Use GitHub forks for Swift 6.3 compatibility

Update all local path dependencies to use GitHub forks:
- doozMen/GRDB.swift (master) - synced with upstream v7.9.0
- doozMen/swift-sharing (main) - Swift 6.3 fixes for swift-perception
- doozMen/swift-structured-queries (main) - Swift 6.3 compiler crash guards

All CloudKit code guarded with `!compiler(>=6.3)` to avoid compiler crashes.
Tested successfully with Swift 6.3-dev snapshot.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: 2 people

Package.resolved

@@ -25,15 +25,18 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-collections", from: "1.0.0"),
-        .package(name: "GRDB.swift", path: "../GRDB-swift"),
+        // NB: Fork synced with upstream v7.9.0
+        .package(url: "https://github.com/doozMen/GRDB.swift", branch: "master"),
         .package(url: "https://github.com/pointfreeco/swift-concurrency-extras", from: "1.0.0"),
         .package(url: "https://github.com/pointfreeco/swift-custom-dump", from: "1.3.3"),
         .package(url: "https://github.com/pointfreeco/swift-dependencies", from: "1.9.0"),
-        // NB: Local fork with Swift 6.3 fixes for swift-perception (transitive dependency)
-        .package(name: "swift-sharing", path: "../swift-sharing"),
+        // NB: Fork with Swift 6.3 fixes (uses doozMen/swift-perception)
+        .package(url: "https://github.com/doozMen/swift-sharing", branch: "main"),
         .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.18.4"),
+        // NB: Fork with Swift 6.3 fixes
         .package(
-            path: "../swift-structured-queries",
+            url: "https://github.com/doozMen/swift-structured-queries",
+            branch: "main",
             traits: [
                 .trait(
                     name: "StructuredQueriesTagged",