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Install, reinstall or upgrade code of a canister controlled by the NNS.

# Backend Canister Upgrade

This upgrade sets the stage for the upcoming app notifications feature.

Additionally, the UX is improved for some corner cases in the context of SSO access.

## What's Changed

_Since `proposal-backend-144026`_

- feat(be): a delegation for pulling notification data from an app (#4365)
- feat(be): authorize a sender against the list its origin publishes (#4363)
- feat(be): the method an app's backend calls to notify its users (#4362)
- fix(be): report an SSO credential registered through another domain (#4375)
- feat(be): report what a browser registered for Web Push (#4340)
- feat(be): store a browser's Web Push subscription (#4339)
- feat(be): store which apps may notify an identity (#4336)

[Full release notes](https://github.com/dfinity/internet-identity/releases/tag/release-2026-09-25)

## Wasm Verification

To build the wasm modules yourself and verify their hashes, run the following commands from the root of the [Internet Identity repository](https://github.com/dfinity/internet-identity):

```
git pull  # to ensure you have the latest changes.
git checkout 64ba163788085b0606fcaa0e106d8a15ab73338b
./scripts/verify-hash \
    --ii-hash ffac2970f854d38d07dcf68130c58fb236bfc5c671d4e92535fb614fc715de2f \
    --archive-hash 24ff2e5186b6787c274ff8a61e90150d9fdb0838156ee44fe3faf80d12852bb4
```

## Backend Argument Verification

Run the following command to verify the backend upgrade argument hash:

```
didc encode -d ./src/internet_identity/internet_identity.did -t '(opt InternetIdentityInit)' '(
  opt record {
    archive_config = opt record {
      polling_interval_ns = 15_000_000_000 : nat64;
      entries_buffer_limit = 10_000 : nat64;
      module_hash = blob "\24\ff\2e\51\86\b6\78\7c\27\4f\f8\a6\1e\90\15\0d\9f\db\08\38\15\6e\e4\4f\e3\fa\f8\0d\12\85\2b\b4";
      entries_fetch_limit = 1_000 : nat16;
    };
  },
)' | xxd -r -p | sha256sum
```

The output should match the argument hash.


Upgrade Internet Identity Backend Canister to 64ba16378