feat: opt-in Nix devshell for contributor environment#7
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Add flake.nix + .envrc providing pinned Rust 1.95, cargo-pgrx 0.18.0, and per-major Postgres devShells (pg13–pg17). Shell hook initializes pgrx against the nix-provided Postgres so contributors don't need to build Postgres from source or chase ICU/bison/readline deps on the host. CONTRIBUTING.md gains a brew prereqs note, a --pg-config shortcut, and a short Nix section. The brew/apt path is unchanged; Nix is opt-in. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Add flake.nix + .envrc providing pinned Rust 1.95, cargo-pgrx 0.18.0, and per-major Postgres devShells (pg13–pg17). Shell hook initializes pgrx against the nix-provided Postgres so contributors don't need to build Postgres from source or chase ICU/bison/readline deps on the host.
CONTRIBUTING.md gains a brew prereqs note, a --pg-config shortcut, and a short Nix section. The brew/apt path is unchanged; Nix is opt-in.
resolves #6