Trim /setup skill and remove ROADMAP.md

[sebastientaggart]

Trim /setup skill from 475 to 371 lines (22% reduction) by removing redundant content:

• Removed skills reference table from State 1 (already in README)
• Merged greenfield label guidance into Phase 2's existing label population flow
• Compressed Phase 3 config walkthrough into a pattern definition + table instead of repeating longhand for each value
• Factored out shared profile selection questions

Also deletes ROADMAP.md — all items have been addressed or captured as backlog tickets.

No behavioral changes to the setup wizard.

Issue #111

[sebastientaggart]

Review Summary

Verdict: APPROVE

Findings

• [NOTE] The greenfield guidance moved from Phase 3 to Phase 2 drops the explicit baseline label set recommendation (work intake + QA lifecycle + priority labels) and the interactive "Want me to help apply this baseline now?" prompt — Phase 2's existing zero-label handler already covers label creation, so the practical impact is minimal, but the priority label suggestion (priority:high/medium/low) is lost entirely.
• [NOTE] The TICKET_LABEL_CREATION_ALLOWED table entry no longer mentions "Defaults to false", which was present in the original longhand description — an LLM following the skill may not infer the default.

No correctness or security issues. The refactoring preserves all behavioral flows (profile selection, confirmation gates, write-only-on-yes). ROADMAP deletion is justified — swarm mode is captured in issue #109, /status enhancements shipped in PR #107, /checkpoint skill exists, and three-branch Makefile is tracked as issue #6.

[sebastientaggart]

Review Summary (re-review)

Verdict: APPROVE

Both notes from the prior review have been addressed:

• The "defaults to false" clarification for TICKET_LABEL_CREATION_ALLOWED is now present in the Phase 3 table (line 339).
• The priority label suggestion (priority:high, priority:medium, priority:low) and milestone guidance are now included in the Phase 2 greenfield note (line 291), merged naturally into the label population flow.

No new issues found. The refactoring correctly preserves all behavioral flows (profile selection, confirmation gates, write-only-on-yes, per-profile value scoping) while reducing duplication through shared patterns and table-driven definitions. ROADMAP deletion remains justified.