docs: document the minimal IAM policy for the executor

[nh13]

Adds a "Required IAM permissions" section to docs/further.md giving the minimal policy the executor role needs:

• Core policy (always required): batch:SubmitJob, batch:DescribeJobs, batch:RegisterJobDefinition, batch:DeregisterJobDefinition, batch:TerminateJob, batch:DescribeJobQueues, batch:DescribeComputeEnvironments, and iam:PassRole.
• Tags add-on (--aws-batch-tags / SNAKEMAKE_AWS_BATCH_JOB_TAGS): batch:TagResource, with a note that ecs:TagResource may also be required depending on the account's tag-authorization settings (for tag propagation to ECS).

Each permission is tied to the feature that needs it, and the register/deregister and PassRole statements are called out as conditional (register/deregister can be dropped with a pre-existing job definition; PassRole is only needed when --aws-batch-job-role is set, and should be scoped to that role ARN). Cross-linked from the README.

Docs-only — no code changes.

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