v0.38.0 — persistent-memory write-side

Added

• A finding event — the durable spine of the optional persistent-memory layer.
  A finding message and SynapseAgent.record_finding(...) author one memory
  atom (a codebase fact, lesson, decision, dead-end, or outcome) and place its
  assertion on three independent axes: what kind of evidence backs it, the
  standing of the claim, and how recently the supporting reference was re-checked
  at source (freshness). An emit gate admits, floors, or rejects each atom at the
  hub edge before it is journalled, so a claim stronger than its evidence is
  lowered rather than trusted: falsified evidence renders a claim refuted and,
  if it also claims reference-validated, is refused outright as a contradiction;
  producer-asserted testimony cannot be recorded as reference-validated nor declare
  itself verified-at-source; and a reference-validated claim must carry a reference
  and a source-verified freshness, so a reference that exists but was never
  re-checked this session is floored to bounded support rather than passing for a
  validated one. A record missing its provenance, validity window, or a required
  claim status is refused outright, and an unknown enum member is carried opaquely
  so the wire format can evolve. The hub attests the producing identity and the
  time (they cannot be self-reported), journals an admitted finding durably, and
  broadcasts the verdict to the fleet so a producer whose claim was floored learns
  what was downgraded. The hub stays memory-agnostic — it carries every record
  without interpreting it.
• Distinct durable event kinds for resume checkpoints and handoffs. A saved
  checkpoint and an atomic handoff were previously journalled as a claim
  re-snapshot; they now record under their own checkpoint and handoff kinds.
  Each still carries the full claim snapshot, so replay reconstructs the claim
  (and a legacy log that journalled them as claim still replays unchanged), but
  the persistent-memory read-side can now pick out resume summaries and ownership
  transfers — the highest-signal episodic memory — without re-deriving them from
  generic claim snapshots.