v26.89.0 — remove the uzys 6-Gate workflow (BREAKING)

BREAKING: the uzys 6-Gate workflow is removed entirely.

A multi-persona audit found the opt-in gating only covered the /uzys:* commands — the hooks, agents, install output, and the OpenCode transform leaked the gate to users who never selected it. Rather than complete the gating across four CLIs, the feature is retired.

Removed: uzys-harness asset · /uzys:spec…ship (+auto) commands · gate-check.sh + agentshield-gate.sh hooks · gate-status.json · withUzysHarness + manifest gating · uzys emission in the Codex/OpenCode/Antigravity transforms · the global opt-in flags --with-codex-skills / --with-codex-prompts / --with-antigravity-global. Asset catalog 58 → 57.

Preserved (not 6-Gate): dev-method skills (6), tauri-desktop, the reviewer/plan-checker agents, the general hooks, gates-taxonomy, --with-codex-trust.

See ADR-023. Supersedes ADR-011/017/018.