docs(api): document the channel-block requirement on template creation

[mikemilla]

Regenerated SDK.

What changed in the API

No endpoints added or removed — this updates generated code only.

What changed in this SDK

13 files changed, 232 insertions(+), 6 deletions(-)

Files

 api.md                                                        |  1 +
 src/courier/resources/journeys/templates.py                   | 14 ++++++
 src/courier/resources/notifications/notifications.py          | 20 ++++++++
 src/courier/resources/tenants/templates/templates.py          | 20 ++++++++
 src/courier/types/__init__.py                                 |  1 +
 src/courier/types/shared/__init__.py                          |  1 +
 src/courier/types/shared/elemental_channel_node.py            | 10 +++-
 src/courier/types/shared/elemental_node_non_channel.py        | 75 ++++++++++++++++++++++++++++++
 src/courier/types/shared_params/__init__.py                   |  1 +
 src/courier/types/shared_params/elemental_channel_node.py     | 10 +++-
 src/courier/types/shared_params/elemental_node_non_channel.py | 77 +++++++++++++++++++++++++++++++
 tests/api_resources/journeys/test_templates.py                |  4 +-
 tests/api_resources/tenants/test_templates.py                 |  4 +-
 13 files changed, 232 insertions(+), 6 deletions(-)

This branch is rebuilt from main on every spec change and force-pushed, so it always reflects the latest generated output. Hand-written files in this repository are left untouched; anything under the generated surface is replaced on the next update, so fix the specification rather than editing here.

This PR is squash-merged automatically by the api-spec merge job, which then lets release-please open this SDK's release PR. Every type in release-please-config.json except test and ci is a non-hidden changelog section, so docs and chore cut a patch just as feat/fix do.