Recreate "slp_exttype.h" on every change of "Objects/typeobject.c".

… fix

Moves the previously-local /data/users/alexturner/phoenix/push.sh into
the cpython repo as cpython/scripts/push.sh so fresh clones and other
machines inherit the structural fix without per-machine setup.

Per supervisor 2026-05-06 15:34Z + librarian 15:33:57Z (cites
D-1776902911 numstat_bundle.sh in-tree precedent for push-hygiene
scripts) + gatekeeper 10:16Z + pythia python#289 scope-local-only audit.

Behavior:
  scripts/push.sh             — push HEAD (the safe default).
  scripts/push.sh COMMIT      — resolve COMMIT, compare to HEAD;
                                 match → proceed; mismatch → REFUSE
                                 with explicit error citing the
                                 3-incident history (D-1776242717,
                                 feedback_verify_head_before_push,
                                 D-1777993894) + 3 alternatives
                                 (no-arg, git-direct, cherry-pick).

Why the COMMIT-arg restriction: `git push origin COMMIT:branch`
fast-forwards EVERYTHING reachable from COMMIT, not just COMMIT.
The ancestor-sweep footgun fired three times; per supervisor
18:14:38Z code-fix > codify directive (D-1778004893), refuse
COMMIT != HEAD at the script boundary.

Path resolution: cd via SCRIPT_DIR/.. so the script works from any
caller cwd inside or outside the repo.

Verified:
  - bash -n scripts/push.sh → syntax OK
  - scripts/push.sh 0d7d31c (HEAD=e68c6ff175) → REFUSE path
    triggers cleanly with both SHAs + 3 alternative invocations
  - HEAD-match path: REQUESTED == HEAD_SHA proceeds to git push

Local /data/users/alexturner/phoenix/push.sh becomes a thin wrapper
that exec-delegates to scripts/push.sh, preserving existing
muscle-memory invocations on this machine.