v0.27.1

Planner dropped-step diagnostics: fix five defects in the v0.27.0 note-step guard.

• TASK-MODE COVERAGE HOLE: v0.27.0 replaced the note-step guard with hasTargetCoverageGap, which derives from enhancedEditableTargets and is therefore ALWAYS false in task mode. A task-mode plan shipped silently minus every step that was dropped, with no indication anything was discarded. The guard is now one pure exported decision (evaluatePlanGuard) that computes taskMode and hasTargetCoverageGap itself and applies a MODE GATE internally: story mode is governed by coverage, task mode by dropped work. Both guard sites are pure delegations.

• DROPPED-STEP SET: new exported computeDroppedSteps — an identity-keyed set difference ({raw steps the LLM authored as executable} MINUS {classified.executable}). It never gates on rejectionReasons, which is a SUPERSET of the drops (the advisory "missing paired test/doc" loop pushes descriptors for steps that were KEPT, into the same array object, mutating it in place). Identity keying is required: a label-keyed difference computes {P} \ {P} = ∅ when a kept step and a dropped step share a path, losing the drop entirely.

• UNNAMEABLE REJECTIONS: the "No executable actions generated" description rendered rejections via r.path, so a pathless step became the literal string "null: ". It now renders by r.label, which always falls back path → title → .

• SILENCED DIAGNOSTIC: steps hard-rejected as _invalid vanished from the retry prompt, so the planner asked the LLM to fix something it never named. Dropped steps are now named — with action, path, title and reason — in both the retry guidance and the refinement_required payload.

• DEBT: the exhausted-return payload's noteSteps is now noteLabels (the apologetic comment and the contorted inline expression are gone), and the source-text grep in planner-note-step-degeneracy.test.mjs that pinned that expression in place is de-mirrored into behavioral assertions against the real exported payload builder.

LLM-authored note steps are never treated as lost work — commentary must not cost a build.