feat(ci): mint the App token via the in-cluster OIDC broker#4
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Replaces actions/create-github-app-token (App private key as a repo secret) with an exchange against cluster-iac's github-token-broker: the job's OIDC identity token buys a ≤1h installation token whose permissions are pinned in the broker's checked-in trust policy. The CORA_APP_ID / CORA_APP_PRIVATE_KEY secrets become removable; soft-fails to GITHUB_TOKEN while the broker is unseeded or unreachable.
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Swaps the repo-secret App PEM for the OIDC → github-token-broker exchange (cluster-iac#3260). Trust policy pins this repo to issues/checks write + PR/contents read. Soft-fails to
GITHUB_TOKENuntil the broker is seeded, so this is safe to land first.