CLI send enhancements and shared plugin event routing

[gschier]

Summary

• add and wire a dedicated CLI plugin event bridge with key/value support and explicit unsupported-request errors
• add top-level CLI send flow improvements and coverage for workspace/folder send behavior
• refactor plugin event routing through shared grouping (Shared/Host/Ignore) and move non-request events out of app-side Ignore handling
• rename workspace-list plugin event to list_open_workspaces_* and update runtime/bindings

Validation

• cargo test -p yaak
• cargo test -p yaak-cli
• cargo check -p yaak-app
• npm run -w packages/plugin-runtime-types build --if-present
• npm run -w packages/plugin-runtime build --if-present

[chatgpt-codex-connector]

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