Repair the long program path so it runs end to end #1758

The long program path (research → triage → plan program → plan implementation → accept → activate) likely does not work end to end. Three interlocking defects, all in workflows/squad.md. They should be fixed together — fixing any one alone leaves the path broken.

Defect 1 — accept requires an artifact the program path never produces

## skill: squad-plan-accept (~L633), Step 1 hard-requires a plan artifact. The program path produces a program artifact and has no plan at that point.

So accept fails on the very path it exists to serve.

Defect 2 — implement dispatches epics as if they were tasks

plan activate creates a three-level hierarchy:

Root
└── Epics
    └── Tasks

But /squad implement dispatches only immediate children. Running implement on the root therefore dispatches epics as worker issues rather than tasks — each worker receives a unit of work far too large to implement in one PR.

Defect 3 — validate runs too late

Current order:

research → triage → plan program → plan implementation
  → accept scope → plan validate → accept implementation → activate

plan validate must move before both accepts, so the complete package is challenged before anything is locked. Tracked jointly with the validate-teeth issue.

Also worth doing: SpecKit vocabulary alignment

The sequence doesn't map onto SpecKit's specify / plan / tasks / implement vocabulary, which is the mental model of the target audience. plan implementation is effectively the tasks step — a /squad tasks alias would ease adoption at near-zero cost.

Where the code lives

All in workflows/squad.md:

⚠️ Never put a ## heading inside a ## skill: block. The block closes implicitly at the next H2 and everything up to the next skill marker is silently discarded — ~29 KB was lost this way once, and it still compiled clean. Skills use #####. Run npx vitest run test/gh-aw-quality.test.ts before pushing; it asserts zero discarded bytes.

Origin

Found by Flight during architectural review following the 2026-08-19 live end-to-end run.

Goal and Success Criteria

Added 2026-08-20 during wave:1 triage. One criterion per defect; each is independently falsifiable.

Goal: Fix all three structural defects in workflows/squad.md so that /squad plan (program path) → /squad accept → /squad activate → /squad implement on a 3-level epic produces correct task dispatch without manual correction.

SC-1 — Defect 1: accept works on program artifacts, not just plan artifacts.
squad.md's squad-plan-accept Step 1 uses a dynamic lookup that resolves both plan and program artifact types. Fails if squad.md:~L654 still contains a literal identifier that only matches the basic plan-path artifact.

SC-2 — Defect 2: Epic Dispatch dispatches tasks, not epics.
The Epic Dispatch section (~L529-554) dispatches only leaf tasks — children that have no open sub-issues of their own. Fails if the dispatch step iterates over direct children of the root without filtering out intermediate Epics (items that themselves have children).

SC-3 — Defect 3: Validate runs before both accept steps.
The squad-plan-validate section appears before both squad-plan-accept and squad-plan-implementation-accept in the workflow definition ordering. Fails if validate (~L867) still appears after accept-scope in the file.