Add gitignore and xcconfig scaffolding for local OpenAI secrets.

Keep Secrets.xcconfig out of git while committing the shared build config and example template.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -0,0 +1,24 @@
+# Local secrets — never commit API keys
+Config/Secrets.xcconfig
+
+# macOS / Xcode
+.DS_Store
+xcuserdata/
+*.xcuserstate
+DerivedData/
+build/
+
+# Swift Package Manager
+.swiftpm/
+Package.resolved
+
+# Local overrides
+*.moved-aside
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3

Config/Secrets.xcconfig.example

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+// Copy to Secrets.xcconfig (gitignored) and fill in values.
+// Prefer OPENAI_API_KEY_OBFUSCATED (base64 XOR with salt IndeedAIJobsPhase3).
+// See Services/OpenAI/SecretsProvider.swift for encode helper notes.
+
+OPENAI_API_KEY_OBFUSCATED =
+FEATURE_AI_INTERPRETATION_ENABLED = YES

Config/Shared.xcconfig

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+// Defaults — overridden by local Secrets.xcconfig when present.
+OPENAI_API_KEY_OBFUSCATED =
+FEATURE_AI_INTERPRETATION_ENABLED = YES
+
+#include? "Secrets.xcconfig"