env.nx

env.nx -- parse .env / dotenv-style configuration files. The de facto standard for deployment config (Heroku, Vercel, Docker Compose, direnv, 12-factor apps all use this format). Line-oriented; each non-comment non-blank line is: KEY=value KEY=\"value with spaces\" KEY='single-quoted' KEY= (explicit empty) Comments start with '#'. Blank lines ignored. Unquoted values are trimmed of leading/trailing whitespace; quoted values are taken verbatim between quote marks (no escape handling for simplicity -- callers with \"dangerous\" values use JSON in the .env + parse with json.nx). Keys must match [A-Za-z_][A-Za-z0-9_]* or the line is skipped. Used by: every Nishi service runtime for config, local dev workflows, CI environment injection. Complements ini.nx (which has sections) + query.nx (URL encode) by covering the linear-only case. Invariants: E1 Zero-alloc: offsets into caller's buffer. E2 Malformed lines silently skipped (caller logs if needed). E3 Duplicate keys both emitted; caller-supplied last-wins semantics if desired. E4 CRLF and bare LF line endings both accepted.