chore: keep env example unignored

[max23468]

Summary\n- remove duplicate ignore patterns that re-ignored .env.example\n- keep real env files ignored while allowing the tracked example file to remain visible to Git hygiene checks\n\n## Checks\n- git diff --check\n- git ls-files -ci --exclude-standard\n- Codex feedback inbox checked via gh issue view

[chatgpt-codex-connector]

💡 Codex Review

Sentinel/.gitignore

Line 6 in 9d41900

.env.*

Ignora anche i file .envrc locali

Con questa modifica restano ignorati solo .env e .env.*, quindi in ambienti che usano direnv file locali come .envrc o .envrc.local non vengono più esclusi (verificato con git check-ignore: .env.local matcha, .envrc no). Se lì finiscono token SMTP/Vercel o altre variabili locali, tornano visibili a git status e possono essere committati per errore; aggiungi un pattern specifico per .envrc* senza re-ignorare .env.example.

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