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test(cli): cluster e2e hardening — lost-state recovery, out-of-band drift, root destruction, multi-graph convergence (#166)

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Four lifecycle compositions over the spawned binary that pin spec claims no
single-command test proves:

- Lost ledger: delete state.json -> re-import from the live graph -> re-apply
  converges onto the same content-addressed blobs (axiom 5's reconstructable-
  state resilience edge, end to end).
- Out-of-band schema apply (the Sarah/Bob violation): refresh marks
  graph/schema Drifted with schema_mismatch, status and plan surface it, and
  cluster apply refuses to silently correct it — state keeps the LIVE schema
  digest (drift correction is gated, axiom 8).
- Destroyed graph root: refresh records graph_missing drift and drops
  graph/schema digests while preserving query/policy; plan proposes deferred
  creates only; apply moves nothing and the catalog stays intact.
- Two graphs (one live, one not yet created) + a graph-spanning policy + a
  cluster-scoped policy: a single apply yields all four dispositions at once
  (applied/derived/deferred/blocked, deterministically ordered), then the
  second graph appears, refresh observes it, and apply converges.

Helpers: init_named_cluster_graph generalizes init_cluster_derived_graph;
write_multi_graph_cluster_fixture builds the two-graph config.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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@ -7,7 +7,7 @@ This file is the always-on map of the test surface. **Consult it before every ta
| Crate | Path | Style |
|---|---|---|
| `omnigraph` (engine) | `crates/omnigraph/tests/` | Integration tests (21 files), fixture-driven, share `tests/helpers/mod.rs` |
| `omnigraph-cli` | `crates/omnigraph-cli/tests/` | `cli.rs` (unit-ish), `system_local.rs`, `system_remote.rs`, share `tests/support/mod.rs` |
| `omnigraph-cli` | `crates/omnigraph-cli/tests/` | `cli.rs` (unit-ish; includes the `cluster_e2e_*` lifecycle compositions over the spawned binary — lost-state re-import recovery, out-of-band drift, graph-root destruction, multi-graph mixed-disposition convergence), `system_local.rs`, `system_remote.rs`, share `tests/support/mod.rs` |
| `omnigraph-cluster` | mostly in-source `#[cfg(test)] mod tests` | Cluster config parser, local JSON state diff, state CAS/lock handling/recovery, read-only validate/plan/status plus explicit refresh/import graph observations, and config-only apply (content-addressed payload publish, disposition gating, composite-digest convergence, idempotent re-apply) |
| `omnigraph-server` | `crates/omnigraph-server/tests/` | `server.rs` (HTTP-level), `openapi.rs` (OpenAPI drift / regeneration) |
| `omnigraph-compiler` | mostly in-source `#[cfg(test)] mod tests` | Parser, type-checker, IR lowering, lint |