chore: remove build artifacts and ad-hoc scripts, update .gitignore

Removed from tracking:
- demo.tape (VHS recording script, contained server IP)
- TEST_RELEASE.md (1-line test file)
- scripts/test_mcp_*.sh, test_null_fix.sh (ad-hoc debug scripts)

Updated .gitignore to prevent re-adding:
- melisai, *.test (compiled binaries)
- demo.tape, TEST_RELEASE.md
- scripts/test_mcp_*.sh, scripts/test_null_fix.sh
- articles/ (local drafts, not for repo)
- .claude/, .gemini/ (AI tool local state)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dmitriimaksimovdevelop

.gitignore

@@ -1,13 +1,16 @@
 # Binaries
 bin/
+melisai
 *.exe
+*.test
 
 # Test coverage
 coverage.out
 *.coverprofile
 
 # Build artifacts
 dist/
+demo.tape
 
 # IDE
 .idea/
@@ -23,13 +26,20 @@ Thumbs.db
 # Go
 vendor/
 
-# Context docs (internal)
+# Context docs (internal, force-added selectively)
 context/
 
-# Gemini agent artifacts
+# AI tools
 .gemini/
-/melisai
 .claude/
-collector.test
-*.test
+
+# Release automation artifacts
 docs/RELEASE_WORKFLOW.md
+TEST_RELEASE.md
+
+# Ad-hoc test scripts (not part of go test suite)
+scripts/test_mcp_*.sh
+scripts/test_null_fix.sh
+
+# Articles (local drafts)
+articles/