Add scripting command families

[maniramezan]

Summary

Adds typed command families for Make, Node, Npm, Yarn, Pnpm, Bun, Terraform, Kubectl, and Python so scripting-oriented tools can be composed through SwiftyShell with package-trait gating.

Changes

• Added public fluent wrappers and command builders for Make, Node, Npm, Yarn, Pnpm, Bun, Terraform, Kubectl, and Python.
• Added trait declarations, All umbrella wiring, CI trait detection, and reusable CI matrix entries.
• Added mock-based tests for each new family.
• Added DocC pages, updated the landing page, trait selection docs, getting started inventory, README, and shared agent guidance.

Testing

• swift test --enable-all-traits (full surface)
• swift test (default = Core only)
• swift-format lint --strict --recursive Sources Tests Scripts
• swift -warnings-as-errors Scripts/validate-traits.swift
• swift -warnings-as-errors Scripts/validate-docc-coverage.swift
• swift test -Xswiftc -warnings-as-errors
• Full local trait matrix before adding Yarn/Pnpm/Bun: "" Git Brew Grep Fzf Rg Swift Gh Docker Make Node Npm Terraform Kubectl Python Rsync Tar Zip Unzip CommonUtilities All
• Isolated build/test for new additional traits: Yarn, Pnpm, Bun
• swift package -Xswiftc -warnings-as-errors --allow-writing-to-directory docs generate-documentation --target SwiftyShell --output-path docs --transform-for-static-hosting --hosting-base-path SwiftyShell
• swift test --enable-all-traits --enable-code-coverage -Xswiftc -warnings-as-errors --show-codecov-path
• swift test --enable-all-traits --enable-code-coverage -Xswiftc -warnings-as-errors
• swift -warnings-as-errors Scripts/validate-code-coverage.swift --input .build/arm64-apple-macosx/debug/codecov/SwiftyShell.json --minimum-line-coverage 84 (90.53%)
• make linux-ci

New Command Family Checklist

• Trait declared in Package.swift (PascalCase, matches type name)
• Trait added to the All umbrella enabled traits
• Every source file in the family is wrapped in #if <Trait> ... #endif
• Tests exist under Tests/SwiftyShellTests/<Trait>/ and are wrapped in #if <Trait>
• swift build --traits <Trait> succeeds in isolation (covered by local trait checks)
• swift test --enable-all-traits passes
• Public API is documented per the rules in AGENTS.md
• DocC landing page and trait table updated
• swift Scripts/validate-traits.swift passes locally
• swift-format lint --strict clean on every touched Swift file

Notes

• Tests are mock/command-shape based, so CI does not require Node, npm, Yarn, pnpm, Bun, Terraform, kubectl, Make, or Python executables for these families.