Generalize sorting Lambda buildspec for mission deploys

[jamesray]

Summary

• Generalizes the sorting Lambda CodeBuild buildspec around MISSION_NAME.
• Keeps HERMES as the default behavior while allowing mission-specific ECR repo names and base images.
• Passes MISSION_NAME, LAMBDA_PIPELINE=SORTING, and the image tag into the architecture build so deployments can be driven automatically again.

Why

The sorting buildspec was hard-coded to the original HERMES deployment path. This makes it awkward to reuse the same build automation for additional missions. This change makes the build/deploy handoff mission-aware while keeping the HERMES default intact.

Validation

• Parsed buildspec.yml as YAML with Ruby.
• Ran git diff --check.
• Confirmed the Dockerfile accepts the BASE_IMAGE build arg.
• Scanned the changed file for high-confidence credentials; no AWS keys, GitHub tokens, Slack tokens, or private keys found.