Add v1.0.3 release notes

Author: 72santoshji

RELEASE_NOTES_v1.0.3.md

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+# Release Notes v1.0.3
+
+Date: 2026-02-17
+
+## Highlights
+- SDK-first integration guidance across examples and demo docs.
+- Root README updated with a minimal SDK integration recipe for any agent framework.
+- Legacy KakvedaGuard references reframed as reference-only.
+
+## Changed
+- Examples docs now prefer `kakveda_sdk` and `KakvedaAgent` for integration.
+- Legacy manual guides point to `kakveda_sdk.guard.KakvedaGuard` instead of removed helpers.
+- Updated warn URL examples to port 8105.
+- Added SDK quick integration section to the examples index.
+
+## Notes
+- Legacy docs remain for historical context; new integrations should use `kakveda_sdk`.