Archive soliplex/ingester (superseded by ingester-agents + haiku.rag's haiku-ingester) #114

The last functional commit landed 2026-05-20 (#109). Ingestion in current deployments runs through soliplex/ingester-agents feeding haiku.rag's haiku-ingester (run-batch / serve); ingester-agents has no runtime dependency on this service, and afsoc-rag pins only ingester-agents.

Before archiving:

• Close or land the open PRs (#110 contention/locking, #64 docling docs, #106 / #107 / #112 CI and dependabot bumps) and the open issues (Add logfire support #26, CI: Node 20 deprecation in .github/workflows #111, ingestion pipeline notes #113). If any of ingestion pipeline notes #113's pipeline notes still apply, move them to ingester-agents.
• Update the soliplex/soliplex README entry (README.md line 164, "Content ingestion pipeline") to point at ingester-agents.
• Update ingester-agents' description ("Agents for use with soliplex-ingester") in pyproject.toml and the Dockerfile org.opencontainers.image.description label.
• Add a README banner here naming the replacement, then archive the repo.