Use emerald truecolor for ASCII banners in Makefile and console

[blackopsrepl]

Motivation

• Improve the visual appearance of the project banners by switching to an emerald truecolor across the build Makefile and the console banner.

Description

• Add an EMERALD ANSI color escape sequence to the Makefile and use it for the ASCII banner and the build system label.
• Define an EMERALD RGB tuple in crates/solverforge-console/src/banner.rs and apply truecolor(...) to the banner and version line, with the version made bold.
• Keep existing color constants and banner formatting otherwise unchanged.

Testing

• Ran cargo build --workspace which completed successfully.
• Ran cargo test --workspace which completed successfully.

---

Codex Task

[blackopsrepl]

Closing as superseded. The equivalent changes are now on main: the Makefile emerald banner was already present, and the console emerald banner landed directly on main in 0f08921 for inclusion in 0.8.2.