Pin neutral Weird-Git actor identity

Author: myobie

cells/weird-git-setup/fixture/setup-megarepo.sh

@@ -8,12 +8,8 @@ set -euo pipefail
 SB="${CATALOG:?CATALOG must be set — st2 eval provides it to run steps}"
 cd "$SB"
 SEED="$SB/.seed"
-AUTHOR_NAME="$(git config --get user.name)"
-AUTHOR_EMAIL="$(git config --get user.email)"
-[ -n "$AUTHOR_NAME" ] && [ -n "$AUTHOR_EMAIL" ] || {
-  echo "FAIL: the invoking Git identity must be configured before materializing the eval" >&2
-  exit 1
-}
+WORKTREE_ACTOR_NAME="Eval Worktree Actor"
+WORKTREE_ACTOR_EMAIL="worktree-actor@eval.invalid"
 
 echo "== seed clampkit (a tiny Node lib with a PLANTED above-range bug + a RED test) =="
 mkdir -p "$SEED/src" "$SEED/test"
@@ -76,10 +72,12 @@ git -C "$SB/canonical.git" config extensions.worktreeConfig true
 # refuse commit ("must be run in a work tree"). Override core.bare=false per-worktree so the checkouts work.
 git -C "$SB/wt/feature" config --worktree core.bare false
 git -C "$SB/wt/main"    config --worktree core.bare false
-git -C "$SB/wt/feature" config --worktree user.name  "$AUTHOR_NAME"
-git -C "$SB/wt/feature" config --worktree user.email "$AUTHOR_EMAIL"
-git -C "$SB/wt/main"    config --worktree user.name  "$AUTHOR_NAME"
-git -C "$SB/wt/main"    config --worktree user.email "$AUTHOR_EMAIL"
+# This fixture owns the declared actor policy for ordinary agent-authored product commits. It is intentionally
+# distinct from the deterministic plumbing identity used above to construct immutable seed history.
+git -C "$SB/wt/feature" config --worktree user.name  "$WORKTREE_ACTOR_NAME"
+git -C "$SB/wt/feature" config --worktree user.email "$WORKTREE_ACTOR_EMAIL"
+git -C "$SB/wt/main"    config --worktree user.name  "$WORKTREE_ACTOR_NAME"
+git -C "$SB/wt/main"    config --worktree user.email "$WORKTREE_ACTOR_EMAIL"
 
 echo "== drop the worker persona into wt/feature (git-excluded so it never shows in the agent's status) =="
 cp "$SB/persona/CLAUDE.md" "$SB/persona/PERSONA.md" "$SB/wt/feature/"