manifest: Make ArduinoCore-API a downloadable blob

[soburi]

In the Zephyr Native build, licenses other than Apache2 are not included
by default, so we will introduce a method to retrieve the file using
west blobs fetch to prepare for future integration.
We will modify the CI script accordingly.

[soburi]

@pillo79
I introduced this because it was required at https://github.com/zephyrproject-rtos/ArduinoCore-zephyr, but I would like to ask you to confirm whether it fit to arduino's CI.

[Copilot]

Pull request overview

This PR transitions the ArduinoCore-API dependency from a checked-out repository/symlink setup to Zephyr’s west blobs fetch mechanism, so license-incompatible upstream headers/sources are downloaded on demand.

Changes:

• Add a blobs: manifest to the module metadata and commit the upstream LGPL license text.
• Update build/packaging logic (CMake + packaging scripts + CI workflows) to consume API sources from zephyr/blobs/ArduinoCore-API/ instead of cores/arduino/api / modules/lib/ArduinoCore-API.
• Remove the legacy install.sh helper and the cores/arduino/api symlink approach.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
zephyr/module.yml	Renames module and introduces a blobs: list to fetch ArduinoCore-API files via west blobs fetch.
zephyr/blobs/ArduinoCore-API/LICENSE	Adds LGPL-2.1 license text for the fetched third-party blobs.
install.sh	Removes manual clone/symlink installer for ArduinoCore-API.
extra/package_core.sh	Packages blobs by transforming zephyr/blobs/ArduinoCore-API into cores/arduino in the final archive.
extra/bootstrap.sh	Fetches blobs during bootstrap (now using --auto-accept).
extra/artifacts/_common.inc	Includes the blobs’ api/ directory in packaged artifacts.
cores/arduino/api	Removes the ArduinoCore-API symlink placeholder.
cores/CMakeLists.txt	Removes direct inclusion/compilation of ArduinoCore-API from the cores/ subdir.
CMakeLists.txt	Adds include dirs and ArduinoCore-API source compilation from the blobs directory.
.github/workflows/package_core.yml	Archives/extracts the blob-based API directory instead of the old symlink path.
.github/workflows/format_check.yml	Removes ignore rule for the deleted cores/arduino/api/** path.
.github/workflows/build.yml	Adds a CI step to fetch blobs before building samples.

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[KurtE]

Sometimes I wonder why this is not handled like: Arduino_RouterBridge and Arduino_RPClite
and added to .gitmodules

Although those other two are probably only needed if you are doing Q development

[pillo79]

@soburi This upstream update caught my eye recently, it's a great idea! I was already working on something like it; my version uses the release zip archive, not each individual file, to allow for "seamless" updates. Will post my PR soon and tag you for review!

[soburi]

Sometimes I wonder why this is not handled like: Arduino_RouterBridge and Arduino_RPClite
and added to .gitmodules

This stems from our plan to support using this as a Zephyr module. In that context, we can’t include GPL-licensed source code in the module itself, to stay aligned with Zephyr’s licensing rules. Using west blobs makes it explicit that any such code is fetched separately by the user.

@soburi This upstream update caught my eye recently, it's a great idea! I was already working on something like it; my version uses the release zip archive, not each individual file, to allow for "seamless" updates. Will post my PR soon and tag you for review!

I think this is a great idea,
but when I tried it, I noticed a few issues.
After doing a west blobs fetch, I expected it to be ready to use, but with zip it requires an extra step.
I'll leave it as it is for now.

[CLAassistant]

All committers have signed the CLA.