Remediate ClickHouse Cloud OpenAPI drift

[sdairs]

Summary

• refresh the vendored ClickHouse Cloud OpenAPI document and remove five obsolete ClickStack connection client methods
• add the current beta UDF client and typed model surface, including tolerant response models and strict request unions
• add the ClickPipe schema-discovery metadata, SCIM enterprise extension, and Degraded ClickPipe state
• regenerate beta-operation metadata and track two inline UDF error-response enum constraints under Model acknowledged OpenAPI enum constraints as typed Rust values #296
• replace removed client tests with focused UDF wiremock and model compatibility coverage

Why

The live Cloud OpenAPI document moved beyond the snapshot recorded by #323: ClickStack connection operations were removed and a beta UDF API was added. The library and snapshot must move together so the shared analyzer, generated metadata, and public Rust surface remain aligned.

Impact

clickhouse-cloud-api now covers the current live spec with direction-aware request strictness and tolerant all-Option response models. Removed ClickStack connection methods no longer expose endpoints absent from the API.

Closes #323.

Validation

• cargo fmt --all --check
• cargo build -p clickhouse-cloud-api -p clickhouse-openapi-analyzer --all-targets
• cargo test -p clickhouse-cloud-api -p clickhouse-openapi-analyzer
• cargo clippy -p clickhouse-cloud-api -p clickhouse-openapi-analyzer --all-targets -- -D warnings
• python3 -m unittest discover -s scripts/tests -p 'test_*.py'
• cargo check --workspace --all-features
• python3 scripts/check-openapi-drift.py --dry-run — 0 actionable drift

[Copilot]

Pull request overview

This PR updates the clickhouse-cloud-api crate (and the shared OpenAPI analyzer metadata) to match the current live ClickHouse Cloud OpenAPI spec: it removes obsolete ClickStack connection endpoints, adds the new beta UDF API surface (client methods + models), and extends models for ClickPipes schema discovery and SCIM enterprise extension compatibility.

Changes:

• Removed five stale ClickStack connection client methods and updated beta-operation metadata accordingly.
• Added beta UDF client methods plus new request/response models (tolerant response structs, strict discriminated request unions).
• Added model updates + tests for ClickPipe schema discovery meta, SCIM enterprise extension, and Degraded ClickPipe state.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/clickhouse-openapi-analyzer/src/config.rs	Extends acknowledged unsupported enum pointers for UDF attach 424 error response enums.
crates/clickhouse-cloud-api/src/client.rs	Removes ClickStack connection endpoints; adds UDF client endpoints (CRUD, attachments, versions, upload session).
crates/clickhouse-cloud-api/src/models.rs	Adds Degraded ClickPipe state; adds ClickPipe schema discovery meta; adds SCIM enterprise extension field; introduces UDF models (requests + tolerant responses).
crates/clickhouse-cloud-api/src/meta.rs	Updates BETA_OPERATIONS to drop removed ClickStack ops and add UDF operations.
crates/clickhouse-cloud-api/tests/client_test.rs	Replaces ClickStack connection wiremock tests with UDF wiremock coverage (pagination, request shapes, attach/detach, etc.).
crates/clickhouse-cloud-api/tests/models_test.rs	Adds compatibility tests for new tolerant response models, schema discovery meta, SCIM enterprise extension, and UDF request strictness.

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[iskakaushik]

LGTM