feat: NMv3: per kind scheduling

[jstuczyn]

The orchestrator can now assign liveness work as well as stress work.

• assign_next_mixnode_testrun becomes assign_next_testruns(&AssignmentRequest), taking a TestPairing (kind + role) and returning a wave. Per-role eligibility adds the node types a role may assign plus the fields its probe needs.
• Kind selection: a per-request cursor rotates over TestKind (via strum, so a new kind joins by existing), skipping disabled kinds and falling through when one has nothing due. Within a kind, the pairing whose next node is furthest behind wins, so the two liveness roles interleave by need rather than by a fixed share.
• The node refresher learns each gateway's plain client websocket port.
• Config: liveness cadence (15m), lease (1m), per-role wave sizes (100 mixnode / 50 gateway), enable flag. Nine new prometheus series: assignments and wave sizes per pairing, in-progress counts and lease expiries per kind.

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Project	Deployment	Actions	Updated (UTC)
docs-nextra	Ready	Preview	Aug 25, 2026 1:42pm
nym-explorer-v2	Ready	Preview	Aug 25, 2026 1:42pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
nym-node-status	Ignored		Aug 25, 2026 1:42pm

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