refactor(cli): migrate renderers to ui.ts design system

[cdot65]

Summary

Second half of the output-consistency work (spec + primitives landed in #279). All six renderer modules now compose ui.ts primitives: uniform bold headers (no per-module color), one glyph per semantic (✓ ✗ ⚠ ○ ● •), aligned key/value blocks, canonical box-drawing tables, standardized "No found" phrasing.

Changes

• 243 of 361 chalk call-sites removed from renderers; remaining 118 are inline value coloring (status/severity words, red/green verdict pairs, mid-line dim suffixes, \r progress bar) where no whole-line primitive fits
• 4 hand-rolled padEnd tables converted to ui.table (cleanup preview, consumption detectors, static-report categories, custom-report prompt sets)
• DLP acks unified to ui.success; detail values de-dimmed per spec (keys dim, values plain)
• Empty-list phrase standardized, trailing periods dropped

Testing

• 652/652 tests; lint + tsc clean
• backup-renderer + redteam-categories specs updated to ANSI-stripped structural assertions

Checklist

• Information content preserved (fields, order, wording)
• Gates green
• Changeset (patch)

Closes #268