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pingqiu edec7098e8 feat: add V2 protocol simulator and enginev2 sender/session prototype

Adds sw-block/ directory with:

- distsim: protocol correctness simulator (96 tests)
  - cluster model with epoch fencing, barrier semantics, commit modes
  - endpoint identity, control-plane flow, candidate eligibility
  - timeout events, timer races, same-tick ordering
  - session ownership tracking with ID-based stale fencing

- enginev2: standalone V2 sender/session implementation (63 tests)
  - per-replica Sender with identity-preserving reconciliation
  - RecoverySession with FSM phase transitions and session ID
  - execution APIs: BeginConnect, RecordHandshake, BeginCatchUp,
    RecordCatchUpProgress, CompleteSessionByID — all sender-authority-gated
  - recovery outcome branching: zero-gap, catch-up, needs-rebuild
  - assignment-intent orchestration with epoch fencing

- design docs: acceptance criteria, open questions, first-slice spec,
  protocol development process

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-28 10:38:27 -07:00

README.md

feat: add V2 protocol simulator and enginev2 sender/session prototype

2026-03-28 10:38:27 -07:00

README.md

private

Deprecated in favor of ../.private/.

Private working area for:

design sketches
draft notes
temporary comparison docs
prototype experiments not ready to move into shared design docs

Keep production-independent work here until it is ready to be promoted into:

../design/
../prototype/
or the main repo docs under learn/projects/sw-block/