Support configurable storage driver, register S3/Google connectors, remove debug prints, and add release readiness review

[squeakycheese75]

Motivation

• Allow the runtime to select the proper storage client at startup instead of always creating SQLite, enabling Postgres support and clearer error messages for unsupported drivers.
• Ensure the default subscription manager registers available connectors (S3 and Google API) and keep plugin/connector registration consistent with declared types.
• Remove runtime-facing debug output from the Git connector and add a lightweight connectivity check for the S3 connector to avoid leaking internal paths.
• Capture a snapshot of release readiness concerns and recommended cleanup in RELEASE_READINESS_REVIEW.md to guide next steps for public release.

Description

• Added newDataStoreClient(cfg configs.Config) and updated newRuntime to use it, routing storage.driver to datastore.NewSQLiteDataStoreClient or datastore.NewPostgresDataStoreClient and returning a clear error for unsupported drivers.
• Added unit tests TestNew_UnsupportedDriver and TestNew_PostgresWithoutDSN to pkg/runtime/runtime_test.go to validate driver selection and DSN requirements.
• Registered the AWS S3 connector and a Google API alias connector in the default SubscriptionManager and updated the registration test expectations in internal/subscription_manager/main_test.go.
• Implemented Ping on S3Connector to validate connectivity and ensure Connect + Close behavior can be exercised.
• Removed debug printing and the printDirRecursive helper from the Git connector to avoid exposing filesystem paths and contents.
• Added RELEASE_READINESS_REVIEW.md documenting high-priority issues and release-focused recommendations.

Testing

• Ran the unit test suite with go test ./..., which executed the subscription manager registration tests and runtime tests including TestNew_UnsupportedDriver and TestNew_PostgresWithoutDSN.
• All automated tests completed successfully (no failures).

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore Postgres-aware SQL plugin registration

By removing the second DatasetTypeSQL registration, SQL datasets now always use SQLiteDataPlugin even when storage.driver=postgres. That plugin infers booleans as INTEGER (internal/plugins/sqlite/plugin.go), but Postgres insert generation emits TRUE/FALSE literals (internal/db/postgres.go), which causes type-mismatch failures when ingesting SQL datasets containing boolean fields on Postgres-backed runtimes. This regression comes directly from dropping the Postgres plugin registration in defaults.

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[squeakycheese75]

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