v0.3.0 — routed failure, sliced context

Since v0.2.0:

• view.cells port slices: {"cell":"prep","ports":["value"]} selects which ancestor outputs enter an agent's context; bare strings unchanged.
• view.graph: the effect context can carry the wiring among the cells an agent can see.
• Field guards {field, equals} route on a field of a json record — no classifier needed. until.field gives repeat the same early-exit form.
• on:"fail" edges route a failure record {code, message} to recovery cells; survivability is declared at admission and composes through nested organisms.
• Failed effects are recorded as {requestDigest, error} — runs containing failures now verify bit-for-bit.
• morphogen explain prints the compiled signature; morphogen diff compares receipts; per-cell work attribution lands on every record.
• New examples: escalate, recover. 77 tests, 11 suite examples all verified.