feat: add Solis lattice fragment publisher

[mgazza]

Summary

• add a pure, default-off Solis Lattice fragment publisher
• model explicitly grouped local/cloud access paths, provider input cursors and inverter observations without touching live Solis discovery, CID, automatic-config or control code
• publish REFERENCE-only topology and only API-verified inverter serials as generic strong identity
• route discovery/config, liveness and removal changes through the common durable invalidation / fresh-read recompile path

Safety

• not registered or invoked by live BatPred runtime code
• emits no materialization roles, config projections, capabilities or writes
• station, configured-but-unverified serial, endpoint, authentication, protocol, CID and TOU profile remain provider metadata rather than identity
• local/cloud paths compose only when the caller explicitly groups them into one device snapshot
• duplicate verified serials, duplicate access paths, same-cursor semantic mutation and mixed input-version regression fail closed
• removal is a durable irreversible tombstone

Invalidation contract

Solis carries independent monotonic discovery and configuration cursors. Advancement of either cursor publishes a new durable provider generation and invalidates the shared compiler. Liveness and removal use the same path. The compiler then fresh-reads every registered publisher, so an invalidation payload is never treated as the authoritative snapshot.

Validation

• Python 3.9: 81 focused/shared tests passed
• Python 3.14: 81 focused/shared tests passed
• black, ruff F401, cspell and diff checks passed
• GitNexus: MEDIUM additive scope, 61 new/touched symbols and one internal set_liveness → read_state flow
• all inspected live Solis symbols are LOW risk and remain untouched

The wider discovery test command has pre-existing environment incompatibilities outside this tranche: Python 3.9 lacks google.protobuf; Python 3.14 has generated protobuf 7.34.1 against runtime 7.34.0.

Stack

• Base: feat: add SolaX cloud lattice fragment publisher #4336
• Tracking: Predictive-Cloud-Ltd/predbat-saas-infra#466
• Fragment programme: Predictive-Cloud-Ltd/predbat-saas-infra#561