Replace the leftover bindings/go references, and extend the Go path guard #1040

The Go module rename in #1001 changed every full module path, but some prose still names the old bindings/go folder. The guard test scripts/__tests__/go-module-path.test.mjs checks only the full module path, so it does not catch these. coderdan found them in review of #1001.

Instructions that no longer work

• languages/golang/stackencrypt/example/README.md:19
• languages/golang/stackencrypt/example/explicit/README.md:27 and :31, which say cd bindings/go

Comments that name the old folder

• languages/golang/stackencrypt/example/main.go:7
• packages/stack-encrypt/CONTEXT.md:6
• packages/stack-guest-abi/Cargo.toml:12 and packages/stack-guest-abi/tasks.toml:2
• packages/stack-guest-abi/src/lib.rs and src/buffers.rs
• languages/golang/stackauth/guest/src/lib.rs:52
• both guests' Cargo.toml
• ADR 0005

Fix

Replace each with languages/golang. Then extend the guard with a second search for bindings/go, with an allowlist for the github.com/cipherstash/vitaminc/bindings/go/... imports, so the old folder name cannot come back.