v0.8.0

• Reviewer/QA verdict capture. The reviewer and qa agents now append their verdict to the LEARN ledger (--source reviewer|qa), not just the deterministic gate. This records the per-AC compliance + adversarial reasoning — the richest GEPA training signal — at zero LM tokens.
• Worktree isolation. Each pipeline run executes in a physically separate git worktree off the base branch (scripts/otta-worktree.sh), so a run can never touch the session's branch or files. Deterministic path → every stage re-derives the same checkout; DevOps tears it down after the PR. Falls back to in-place branch-off-base when worktrees are unavailable. Hardens the v0.7.0 clean-base fix.