chore: initialize safe Javis project scaffold

tests/fixtures/README.md

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+# Test fixtures
+
+Only synthetic, non-secret fixtures may be stored here. Personal Obsidian notes, tokens, logs and production exports are forbidden.

tests/integration/README.md

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+# Integration tests
+
+Integration tests will be added with the first real provider, persistence, or adapter. Phase 0 performs no network or service integration.

tests/unit/test_package_metadata.py

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+"""Dependency-free smoke tests for the phase-0 package."""
+
+import unittest
+
+import javis
+
+
+class PackageMetadataTests(unittest.TestCase):
+    def test_scaffold_version_is_explicit(self) -> None:
+        self.assertEqual(javis.__version__, "0.0.0")
+
+
+if __name__ == "__main__":
+    unittest.main()