feat: add br quick command, scrub upstream repo name from docs

fix(gate): add gate.toml to scope ubs scan to src/ (avoids 1950MB root limit)

fix(pol-6d50): replace panic! macros with proper error handling

fix(beads-polis): gate shellcheck + UBS clean [gate-fix]

Merge branch 'main' of https://github.com/Perttulands/beads-polis

chore(deps): add flate2 for gzip backup compression

fix(install): justify or eliminate silent-fallback patterns (pol-1vtk)

feat(cli): add br lint bead quality gate (pol-2dl)

feat(cli): add br city ready|list city-wide aggregation (pol-2wwj)

docs: fix dead beads.db references, use index.db

feat(cli): add health, backup, restore top-level commands

Remove legacy br sync aliases from README (--import-only, --snapshot)

feat(beads-v2): add v1 compat flag aliases (--silent, --title, --labels, -a, search --limit/--status/--type/--sort)

restructure: promote beads-v2 to root crate, remove old code

ci: target beads-v2/ only, fix clippy warnings, use stable Rust