## Summary
5 improvements, 9 bug fixes.

## Breaking changes
- Self-hosted deployments no longer ship shared default credentials;
fresh installs generate their own. If yours still uses a previously
published default, set a unique value before upgrading, or set
`ALLOW_INSECURE_DEFAULT_SECRETS=true` to keep booting while you migrate.
([#4316](#4316))

## Improvements
- Require explicit browser approval for CLI and MCP login, with
resilient polling while approval is pending.
([#4316](#4316))
- Deployed task telemetry now reports the deployment identifier (e.g.
`deployment_abc123`) in the `worker.id` attribute, instead of an opaque
internal value. Upgrade to get the readable identifier in your own
OpenTelemetry exporters.
([#4316](#4316))
- Prevent prototype pollution when applying run metadata operations or
reconstructing nested telemetry attributes, while preserving legitimate
`constructor` and `prototype` fields.
([#4316](#4316))
- Add helpers to mint and verify the deployment-scoped token used to
authenticate run controllers to the platform.
([#4316](#4316))

## Server changes

These changes affect the self-hosted Docker image and Trigger.dev Cloud:

- Added optional request rate limiting for telemetry ingestion
endpoints.
([#4316](#4316))
- Background-worker deployment lookups are now scoped to the
authenticated environment.
([#4316](#4316))
- Updating a GitHub App installation from the callback flow is now
scoped to your own organization, so an installation ID belonging to
another organization can no longer be used to refresh that
organization's installation record. The GitHub App installation session
is also now single-use, so completing an installation callback
invalidates its state and it can no longer be replayed.
([#4316](#4316))
- Scope schedule and environment-variable writes to the caller's project
and environment
([#4316](#4316))
- Reject compute snapshot callbacks that do not match the snapshot
request that created them.
([#4316](#4316))
- Require secret-key authentication to initialize the session out
(agent→client) stream, matching the append route.
([#4316](#4316))
- Live run and trace subscriptions now validate their identifiers more
strictly and only return data from your own organization.
([#4316](#4316))
- Window-function names in the query compiler are now validated against
the allowlist, matching how other function calls are handled.
([#4316](#4316))
- Authenticate run controllers to the platform with a signed,
deployment-scoped token.
([#4316](#4316))
- Verify that worker actions (starting, completing, and continuing a
run, and reading its snapshots) target a run belonging to the caller's
environment.
([#4316](#4316))

<details>
<summary>Raw changeset output</summary>

# Releases
## @trigger.dev/build@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
## trigger.dev@4.5.6

### Patch Changes

- Require explicit browser approval for CLI and MCP login, with
resilient polling while approval is pending.
([#4316](#4316))
- Deployed task telemetry now reports the deployment identifier (e.g.
`deployment_abc123`) in the `worker.id` attribute, instead of an opaque
internal value. Upgrade to get the readable identifier in your own
OpenTelemetry exporters.
([#4316](#4316))
- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
  - `@trigger.dev/build@4.5.6`
  - `@trigger.dev/schema-to-json@4.5.6`
## @trigger.dev/core@4.5.6

### Patch Changes

- Prevent prototype pollution when applying run metadata operations or
reconstructing nested telemetry attributes, while preserving legitimate
`constructor` and `prototype` fields.
([#4316](#4316))
- Require explicit browser approval for CLI and MCP login, with
resilient polling while approval is pending.
([#4316](#4316))
- Add helpers to mint and verify the deployment-scoped token used to
authenticate run controllers to the platform.
([#4316](#4316))
## @trigger.dev/python@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
  - `@trigger.dev/build@4.5.6`
  - `@trigger.dev/sdk@4.5.6`
## @trigger.dev/react-hooks@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
## @trigger.dev/redis-worker@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
## @trigger.dev/rsc@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
## @trigger.dev/schema-to-json@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`
## @trigger.dev/sdk@4.5.6

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.6`

</details>

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>