Extract the ClickPipes runtime and finalize the cloud CLI split

[sdairs]

Closes #385

Summary

• Move all ClickPipes dispatch, handlers, builders, file/base64 parsing, output, client wrappers, and tests into the ClickPipes domain module.
• Remove the generic cloud commands module and reduce cloud client/CLI facades to shared and top-level responsibilities.
• Preserve all ClickPipes request shapes and keep the cross-domain subprocess wiremock test file unchanged.
• Update contributor guidance and Cloud integration path filters for the final per-domain layout.

Tests

• cargo fmt --all --check
• cargo test -p clickhousectl
• cargo check --workspace --all-features
• cargo clippy --workspace --all-targets -- -D warnings

[Copilot]

Pull request overview

Finalizes the per-domain cloud CLI layout by removing the generic cloud ClickPipes runtime module and moving all ClickPipes dispatch/handlers/builders/parsers/wrappers/tests into the clickpipes domain module, leaving cloud/mod.rs, cloud/cli.rs, and cloud/client.rs with shared/top-level responsibilities only.

Changes:

• Removed the generic cloud/commands.rs monolith and delegated CloudCommands::ClickPipe dispatch to clickpipes::run.
• Moved ClickPipes runtime (handlers, request builders, file/base64 parsing, output) plus CloudClient wrapper methods and unit tests into src/cloud/clickpipes.rs.
• Updated contributor guidance and CI integration path filters to match the final per-domain layout.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/clickhousectl/src/cloud/mod.rs	Removes commands module usage and delegates ClickPipes dispatch to the ClickPipes domain runtime.
crates/clickhousectl/src/cloud/commands.rs	Deleted the generic cloud commands monolith (previous home of ClickPipes runtime).
crates/clickhousectl/src/cloud/client.rs	Removes ClickPipes-specific wrapper methods, leaving core client/auth/error/shared helpers.
crates/clickhousectl/src/cloud/clickpipes.rs	Becomes the single home for ClickPipes clap defs + runtime + builders + CloudClient wrappers + tests.
crates/clickhousectl/src/cloud/cli.rs	Narrows cloud CLI facade to top-level enums and crate-internal domain re-exports.
AGENTS.md	Updates contributor instructions to the final per-domain command pattern.
.github/workflows/cloud-integration.yml	Broadens the ClickHousectl cloud source path filter to src/cloud/** for the new layout.

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[iskakaushik]

LGTM