Support FIFO and non-regular .env files (e.g. 1Password mounts) #613
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This PR fixes an issue where python-dotenv fails to load environment
variables from non-regular files such as FIFOs or fd-backed mounts
(e.g. 1Password’s mounted .env files on macOS).
The loader now uses stream-based reading and includes a regression
test simulating FIFO behavior.
Fixes #598