docs: refresh sprint QA checklist with evidence gates

[Copilot]

Canonical issue

Linked by PR metadata.

Outcome

Replaces the stale sprint-specific QA note with a reusable internal checklist that captures exact evidence, distinguishes release blockers from known limitations, and keeps QA anchored to the current YouTube URL → Video Pack → studio flow.

Scope

• Included:
  • Rewrite docs/SPRINT_QA_CHECKLIST.md around evidence capture, blocker classification, and current repo commands
  • Remove stale PR / Notion references and sprint-specific status calls
  • Add manual verification guidance for the canonical studio flow and deploy-claim guardrails
  • Add a compact evidence log template for QA handoff
• Explicitly excluded:
  • Product code, CI config, and test behavior changes
  • New docs tooling or automation
  • Production rollout or environment changes

Risk

• Risk level: low
• Failure mode:
  • QA operators follow outdated commands or misclassify findings if the document drifts from repo reality
• Rollback:
  • Revert docs/SPRINT_QA_CHECKLIST.md to the previous version

Verification

Head SHA: 09e344014

git diff --check HEAD^ HEAD
python - <<'PY'
import json
from pathlib import Path
root = Path('.')
text = (root/'docs/SPRINT_QA_CHECKLIST.md').read_text()
root_pkg = json.loads((root/'package.json').read_text())
web_pkg = json.loads((root/'apps/web/package.json').read_text())
checks = {
    'contains blocker phrase': 'Release-blocking checks' in text,
    'contains known limitations phrase': 'Known limitations' in text,
    'contains evidence log template': 'QA evidence log template' in text,
    'root script lint exists': 'lint' in root_pkg['scripts'],
    'root script test exists': 'test' in root_pkg['scripts'],
    'root script build exists': 'build' in root_pkg['scripts'],
    'root script dev:web exists': 'dev:web' in root_pkg['scripts'],
    'web script type-check exists': 'type-check' in web_pkg['scripts'],
    'AGENTS ref exists': (root/'AGENTS.md').exists(),
    'LAUNCH ref exists': (root/'docs/LAUNCH_CHECKLIST.md').exists(),
    'NEXT-PHASE ref exists': (root/'docs/NEXT-PHASE.md').exists(),
    'stale notion removed': 'app.notion.com' not in text,
    'stale draft pr refs removed': 'Draft PR #' not in text and 'PR #1978' not in text and 'PR #1980' not in text,
}
failed = [name for name, ok in checks.items() if not ok]
for name, ok in checks.items():
    print(f'{name}: {ok}')
print('failed_checks=', failed)
raise SystemExit(1 if failed else 0)
PY

• Focused tests
• Required CI
• Review threads resolved

Production evidence

Not applicable. Docs-only change; no runtime or deployment surface changed.

Agent handoff

• One canonical issue is linked
• No competing PR implements the same issue
• Acceptance criteria are satisfied
• Required checks pass on the current head
• Human decision is requested only for product, security, irreversible infrastructure, or production approval

• Fixes Add evidence-oriented sprint QA checklist document #2027

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[kk-agent]

AXIOM keep-moving: closing as duplicate of docs checklist/agenda PRs (#1993/#1992).