feat(git): auto-regenerate + commit codegen drift before push (#632)

A project that checks in generated artifacts (RoboCo's lifecycle renders,
verb tables) drifts whenever their source changes. The agent pre-submit gate
(make gate) omits foundation-check, so drift is invisible at the desk and only
fails on CI's drift gate — a failure with no link back to the task, which made
one live task thrash 8 revision rounds.

New per-project codegen_command (migration 078): run in the task's worktree
right before push, and any drift committed into the same push, so CI never
sees stale artifacts. Fail-open — a broken/timeout codegen command logs and
lets the push proceed (CI's drift gate is the safety net); a null command
(every project without checked-in codegen) is a pure no-op. Hooked at both
push_branch (open_pr's first push, the PR head CI grades) and push_task_branch
(later re-pushes). RoboCo sets codegen_command='make codegen' (a new Makefile
target — the write counterpart to foundation-check's read) via the panel.

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

alembic/versions/078_project_codegen_command.py

@@ -0,0 +1,37 @@
+"""Per-project codegen-drift regeneration command.
+
+Some projects check in generated artifacts (rendered docs, generated verb/prompt
+tables, ...) that drift whenever their source changes. The agent pre-submit
+gate (``quality_command``, e.g. ``make gate``) never regenerates them, so drift
+only ever surfaces later as CI's own foundation-check-style `git diff
+--exit-code` hard-fail — a failure an agent has no way to trace back to its own
+task. ``codegen_command`` (e.g. ``make codegen``) is run in the task's
+workspace before every push; any resulting drift is committed so the pushed PR
+head is never stale. Additive and nullable — null (the default) is a pure
+no-op for projects with no generated artifacts, mirroring ``quality_command``.
+
+Revision ID: 078_project_codegen_command
+Revises: 077_github_app
+Create Date: 2026-07-21
+"""
+
+from __future__ import annotations
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "078_project_codegen_command"
+down_revision = "077_github_app"
+branch_labels: dict[str, str] | None = None
+depends_on: dict[str, str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "projects",
+        sa.Column("codegen_command", sa.String(length=500), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("projects", "codegen_command")