V0.9.7

[bartvanbenthem]

Added

• Observability module — koprs::observability::Metrics provides Prometheus
  collectors for the reconciliation loop (koprs_reconciliations_total,
  koprs_reconcile_errors_total, koprs_reconcile_duration_seconds). Wire it in
  with ControllerBuilder::metrics_port(port) to get a GET /metrics endpoint
  with zero manual instrumentation — recording happens automatically around
  every reconcile.
• multicontroller example — a new example operator demonstrating multiple
  CRDs and reconcilers (secretsync, serviceaccountsync) running side by side
  in a single controller process, including manifests and a walkthrough README.

Changed

• Updated the configmapsync and multicontroller example operators.
• Documented the new observability module in the koprs README: module
  overview table, ControllerBuilder methods table, and a dedicated
  "Observability" usage section with example.

Removed

• Dropped the unused koprs-derive and koprs-gen crates and their
  associated tests, gitignores, and READMEs as part of a project structure
  cleanup.
• Removed todo.md.

Internal

• Trimmed Cargo.toml / Cargo.lock and scripts/publish.sh to match the
  reduced workspace member list