NagyZoltanPeter f5946763c4
feat(persistence): add PersistenceV2 interface alongside legacy (phase 1)
Introduce the 5-proc snapshot-based Persistence interface that will
replace the legacy 13-proc one. Both coexist on `ReliabilityManager` so
phase 2 can migrate protocol ops one at a time without breaking existing
callers.

New file:
- sds/types/persistence_v2.nim — `PersistenceV2` type with
  saveChannelMeta / updateHistory / loadChannel / dropChannel /
  setRetrievalHint. `noOpPersistenceV2()` default. Doc-comments capture
  the atomicity pairing (meta save + history update issued back-to-back
  under the channel lock) and the non-fatal failure policy from PLAN §8.

Modified:
- sds/types/reliability_manager.nim — adds `persistenceV2: PersistenceV2`
  field alongside `persistence`; constructor takes both, both default to
  no-op.
- sds.nim — `newReliabilityManager` plumbs the new optional parameter.
- AGENTS.md / CLAUDE.md — GitNexus index re-indexed after phase 0 +
  phase 1 additions; symbol counts updated by `npx gitnexus analyze`.

No call site uses the new interface yet — that's phase 2. All existing
tests still pass against the legacy interface.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-29 12:39:10 +02:00
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