Remove files from git tracking that should be ignored according to .gitignore

- Removed .claude/env.txt (local environment file)
- Removed .codex/agent_contexts and .codex/agent_results (runtime artifacts)
- Removed .vscode/ configuration files (IDE settings)
- Removed ai_context/.vscode/settings.json (IDE settings)
- Removed ai_working/ directory (working files)
- Removed scenarios/ directory (should be ignored per root .gitignore)
- Removed amplifier/scenarios/dataset_discovery/vizualni-admin/next-env.d.ts and tsconfig.tsbuildinfo (build artifacts)
- Removed uv.lock (lock file should be ignored)

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Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

Author: aleksandarilic-vegait