Copy prompt batch 3

[bgrenon]

Enriched Rust, Elixir, and .NET Npgsql guides with content from their corresponding copy prompts. This is batch 3 of the copy prompt enrichment project (batch 1: Express, Prisma, Django in #4692; batch 2: Go, Java in #4700).

Changes:

• Rust: "Notes for AI-assisted setup" <details> section (TLS/SSL mandatory, mutability gotcha for tokio-postgres transactions, dotenvy not dotenv, parameterized queries, security cross-reference)
• Elixir: Transaction example with Postgrex.transaction/2, "Notes for AI-assisted setup" <details> section (SSL mandatory, transaction pattern, parameterized queries, security cross-reference)
• .NET Npgsql: Transaction example with BeginTransactionAsync/CommitAsync/RollbackAsync, "Notes for AI-assisted setup" <details> section (parameterized queries, transaction pattern, await using, .env vs appsettings.json clarification, security cross-reference)

Automated test harness results:

Guide	Raw	Infra issues	Adjusted	Harness finding
Rust	9/10	None	~10/10	Mutability note in <details> worked silently — agent got transactions right without backtracking
Elixir	7.5/10	Package detection missing Elixir patterns	~8/10	All CRUD + transactions passed. Harness needs _build/deps detection (not a docs issue)
.NET Npgsql	7.5/10	.NET SDK install overhead	~9/10	Agent created unused .env alongside appsettings.json. Added clarification to <details> section

The .NET finding is a good example of the <details> section earning its keep: .env files are the default pattern across most guides, so agents default to creating one. The .NET guide uses appsettings.json instead, and the agent-correctional note now catches this.

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Project	Deployment	Actions	Updated (UTC)
neon-next	Error		Apr 22, 2026 8:02pm