feat(stack): run stack manifests as dependency-ordered pull requests

[satyaborg]

Why

Work needing more than one pull request had no path through devloop. The spec skill's scope guard could only refuse it and ask for a smaller slice, so the user was left to hand-manage the branch chain.

What

• A spec with a ## Stack section is now a manifest. Its children run in dependency order.
• Each child's worktree branches from the previous child's branch, and each PR targets it as the base.
• The stack stops at the first child that does not reach accepted, then prints an ordered summary.
• The spec skill now writes a stack instead of refusing when the slices are already clear.

How

parse_stack_children reads the ## Stack section and resolves child paths relative to the manifest, accepting both markdown links and bare paths. run_command dispatches to run_stack before the tmux and single-spec lint paths, since a manifest is not a spec and would fail that lint.

Two existing functions gained an optional argument rather than being restructured: run_devloop takes a base override, and create_worktree takes a start point defaulting to HEAD. The stack threads the previous child's FINAL_BRANCH through both.

Proof

• bash scripts/devloop_test.sh: passes, except the same pre-existing nightshift digest sandbox failure present on main.
• New coverage for all five added functions plus the create_worktree start point, including link and bare-path manifests, order preservation, a plain spec, a missing file, an empty stack, a missing child, and the summary for a stopped stack.

Scope

• Included: manifest parsing, stack orchestration, base and start-point threading, spec skill guidance, README row, usage example.
• Not included: rebasing published descendants when an earlier child changes after its PR is open. The stack runs children in order and stops on the first failure; propagating a changed parent through already-open child PRs is follow-up work.

Stack

• Position: 3 of 3
• Base: feat/living-review-status
• Depends on: PR 1 and PR 2

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	devloop	ce41134	Commit Preview URL Branch Preview URL	Aug 17 2026, 07:46 AM