feat(setup): add setup TUI tracker

[alexandervazquez98]

Closes #6

PR Type

• New feature

Chain Context

Strategy: Feature Branch Chain. This is the draft/no-merge tracker PR.

main
└── 📍 feat/setup-tui-tracker
    └── feat/setup-tui-planner
        └── feat/setup-tui-apply-validation
            └── feat/setup-tui-wizard
                └── feat/setup-tui-docs

Start: main has no SDD/OpenSpec setup context for issue #6.
End: tracker branch contains only setup TUI SDD config.
Prior dependency: none.
Follow-up: child PRs implement planner, apply/validation, wizard, and docs.
Out of scope: runtime setup behavior.

Summary

• Adds openspec/config.yaml for the setup TUI SDD work.
• Records strict TDD, review budget, and target issue metadata.

Changes

File	Change
openspec/config.yaml	Adds SDD configuration for issue #6 setup TUI work

Test Plan

• go test ./...

Contributor Checklist

• Linked an approved issue
• Added exactly one type:* label
• No shell scripts modified; shellcheck not applicable
• Docs/config updated for this work unit
• Conventional commit format
• No Co-Authored-By trailers