[P2] Make the documented .env startup procedure actually load environment variables

[michielbdejong]

Recorded during review of main at a1eb305ccfa2f3fc8ddede4875765cf1b099bd2b. This issue records a finding only; no implementation changes were made or requested.

Finding

The setup instructions suggest copying .env.example to .env, filling it in, and running cargo run. Nothing in the application or declared dependencies loads .env; configuration reads process environment variables directly. A file-only setup therefore does not configure the process.

Evidence

• README.md:59
• src/config.rs:33
• Cargo.toml:1

Desired outcome

Document an explicit export/loading step or provide supported .env loading. Verify the documented fresh setup works.

[michielbdejong]

Fixed in #73 — documented that nothing in the application or its dependencies loads .env files; the README now shows an explicit source .env (set -a/set +a) step before cargo run.

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