## What changed
- Use the shared runtime and effective configuration for account API clients and remote plugin requests, including standalone plugin commands.
- Support dual-header and assertion-only authentication for remote plugins and MCP file uploads when runtime agent instances are enabled.
- Keep plugin credentials and caches scoped to the thread's account when resuming with different credentials. Bind request pools and multi-step plugin storage operations to the selected account so account replacement revokes stale operations.
- Protect runtime credentials on cross-origin redirects while preserving configured routing policies and legacy authentication for custom backends.
- Apply server-provided `upload_headers` to file storage uploads.
## Testing
Add coverage for shared runtime registration, both authentication modes, configuration reloads, resumed-thread account selection, account replacement during plugin uploads and downloads, and credential stripping on redirects. Extend file upload tests to verify runtime assertions and storage-only upload headers.
GitOrigin-RevId: 68aef81051a6f9bf919fffda52f372b108fce805
## What changed
Add `RemotePluginMeasurementCache` to prepare trusted measurement declarations for a single installed `GLOBAL` plugin without loading capabilities or updating the shared plugin catalog.
- Recheck installation authorization on every preparation and scope cached references by authentication identity, endpoint, plugin identity, and version.
- Keep up to four entries, share concurrent downloads, and retain isolated bundle files while commands hold references. Reuse cached historical versions after release updates; download only the current release on a cache miss.
- Respect Windows and POSIX case rules, reject ambiguous matches, and omit authenticated URLs and response bodies from preparation errors.
## Testing
Add bundle preparation tests covering authorization, version reuse, concurrent downloads, cancellation and retry, eviction with live references, case matching, error privacy, and temporary-store cleanup.
GitOrigin-RevId: a68f42b90ff78b7943da676a7b43f1ea76b31582
cooper-oai