skein v0.2.0

Added

• Fifth assumptions lens (Opus) for /review-plan: audits claims the plan states as settled fact but cannot verify from the codebase — backend/external behaviour, business semantics, data shape, unread contracts, environmental facts. /review-plan now runs four high-reasoning Opus lenses plus one Haiku factual lens.

Fixed

• Cross-lens reconciliation (scripts/reconcile-findings.sh) no longer collapses unanchored findings. Findings with no location anchor (empty file + -1 line) each receive a unique merge signature instead of sharing one ("", -1, category) signature and silently dropping all but one. Anchored merge/related behaviour is byte-for-byte unchanged; both the jq and awk-fallback parsers partition identically (including an explicit line:-1). Also benefits /deep-review, which shares the engine.