anti a76b9ecdf9 feat(mazenet): step 7 — topology_mutations queue + mutator reconciler ...

Adds the live-mutation pipeline for active/degraded topologies:

* TopologyMutation table with composite index (state, topology_id)
  so the watch-loop guard query stays O(log n).
* claim_next_mutation is a single atomic UPDATE ... WHERE
  state='pending' so racing reconcilers deterministically pick one
  winner; losers see rowcount=0 and skip.
* reconcile_topologies drains pending rows per live topology, applies
  via decnet.mutator.ops.dispatch, and on failure marks the mutation
  failed + transitions topology to degraded.
* run_watch_loop gains a gated branch: flat-fleet mutate_all runs
  every tick unchanged; the reconciler only enters when the cheap
  has_pending_topology_mutation guard returns True.
* apply_* ops re-check hard invariants (names, IP collisions, subnet
  overlap, known services, service_config shape) after every mutation
  so the repo never lands in an invalid state.
* CLI: 'decnet topology mutate' / 'mutations' subcommands.

2026-04-20 18:02:37 -04:00

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