[KoblerS]

Summary

Adds first-class support for working with multiple Cloud Storage buckets, including a runtime switch for the default bucket — mirroring the existing project-switch tools.

New tools

Tool	Description
storage_list_buckets	List the Cloud Storage buckets in the active project (GCS API)
storage_current_bucket	Show which bucket operations currently default to
storage_switch_bucket	Set the default bucket for subsequent calls; empty resets to the project default

Bucket resolution

Every existing file tool already accepts an optional bucket argument. Resolution order is now:

1. explicit per-call bucket argument
2. the active bucket set via storage_switch_bucket
3. the project default (<project-id>.firebasestorage.app)

The active bucket is scoped per project and resets automatically when you switch projects (switchProject), so you never accidentally keep targeting another project's bucket.

Details

• resolveBucketName() centralizes the resolution; getBucket() in storage.ts now uses it.
• listStorageBuckets() calls the GCS JSON API with the active credentials (local gcloud/ADC session or service account) — no new dependency.
• Same concurrency note as project switching applies: the active bucket is shared mutable state within one server process, so a switch fired in parallel with other calls in the same turn has undefined ordering. Serial usage (the normal case) is deterministic.

Testing

Verified live against a local gcloud session (serial client harness):

• storage_list_buckets returns the project's buckets with an active flag.
• storage_switch_bucket → storage_current_bucket reflects the new bucket; storage_list_files then operates against it.
• Switching with an empty bucket resets to the project default, and subsequent storage_list_files targets the default again.