feat(tooling): auto-assign reviewers to PRs based on custom ranking

Author: Carsons-Eels

.claude/commands/reassign-reviewer.md

@@ -0,0 +1,33 @@
+# Reassign Reviewer
+
+Reassign a fresh reviewer to the current PR after fixes have been pushed. Only the PR author should invoke this skill.
+
+## Steps
+
+1. Determine the current PR number. If not provided as an argument, detect it from the current branch:
+   ```bash
+   gh pr view --json number --jq .number
+   ```
+
+2. Run the reviewer assignment script in rereview mode:
+   ```bash
+   uv run .github/scripts/assign_reviewer.py \
+     --repo ethereum/execution-specs \
+     --pr <PR_NUMBER> \
+     --mode rereview \
+     --assign
+   ```
+
+3. Report who was assigned and why (summarise the selection factors briefly).
+
+## Requirements
+
+- The environment variables `STEEL_OOO_URL` and `STEEL_OOO_KEY` must be set for OOO checking. If they are not set, warn the user but proceed without OOO data.
+- The `gh` CLI must be authenticated.
+
+## When to use
+
+Invoke this skill after:
+- A reviewer requested changes
+- The PR author (and optionally another contributor) pushed fixes
+- The author wants a fresh pair of eyes on the updated PR