v0.3.0

Added

• Per-edge context contract — experimental prototype (item A, headline). A
  workflow may opt in with experimental_per_edge_context: true plus an
  edge_context map ("<from>:<event>" or per-source "<from>" →
  "full" | "scoped" | ["role", …]) to declare, per inbound edge, which
  prior handoffs the destination node's prompt sees. Off by default — default
  workflows are byte-identical. New pure module langgraph/context-contract.mjs;
  wired into the LLM node path (only the prompt's view is narrowed, never the
  durable handoff record). Falsification verdict: KEEP — per-edge context
  provably expresses what per-role static config cannot, demonstrated on the
  stock full-audit-sweep, where implementation re-entered via different
  critics resolves different input views.
• output_schema_conformance workflow gate (item B). Promotes per-node soft
  schema_validation evidence into an auditable run verdict — "every handoff
  that declared a schema conformed to it." Declarable in gates: (validated in
  workflow-validate.mjs), enforced in scoring.enforceGates from per-handoff
  metadata; any non-conforming handoff blocks and names the offending role(s).
• require_distinct_reviewer opt-in assertion (item C). When true,
  workflow-validate errors (non_distinct_reviewer) if any verifier role
  (verifies: true) shares a provider with an implementation entry role — so a
  model never reviews its own work. Opt-in; the default-on flip is deferred.

Notes

• Report-back determinism probe (item D) — feasibility write-up returning a
  verdict: report-back is not expressible on the single-active-node engine,
  and even on a future concurrent engine output-reproducible determinism cannot
  survive it. The
  North-Star wording stays auditable / replayable; "deterministic" is confined
  to DAG traversal/wiring, never outputs.