ci: grant actions:write so bun cache save succeeds

[jnasbyupgrade]

Summary

• claude.yml and claude-code-review.yml both run anthropics/claude-code-action, which internally uses oven-sh/setup-bun with caching enabled.
• Cache writes require GITHUB_TOKEN to have actions: write; with only actions: read (or none), every run logs a harmless but noisy warning: Cache reservation failed: cache write denied: token has no writable scopes.
• This grants actions: write in both workflows' job permissions: blocks.

Security note

actions: write is coarse-grained — besides cache read/write it also allows cancelling/re-running workflow runs and deleting artifacts/logs, but grants no additional contents/PR/secrets access. For claude-code-review.yml (a pull_request_target workflow already gated to the trusted jnasbyupgrade fork owner), this is a modest increase to the existing prompt-injection blast radius described in that file's comments — it does not enable code execution or repo writes beyond what the workflow already has.

Test plan

• Next CI run of Claude Code / Claude Code Review no longer shows the cache warning.

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