docs: tighten sprint demo agenda with per-segment evidence gates

[Copilot]

Canonical issue

Outcome

This updates the internal sprint demo agenda to be explicitly evidence-gated per segment. Each time-box now maps owner + action + observable result + exact command + fallback script so presenters can distinguish verified evidence from narrative.

Scope

• Included:
  • Reworked docs/SPRINT_DEMO_AGENDA.md run-of-show table into a 6-column format:
    • Time, Owner, Demo action, Observable result, Evidence command, Fallback language
  • Added concrete command-level evidence for each segment (home surface, studio handoff, checkout config, sign-in recovery, QA gates, Origin G.A.T.E., closing status).
  • Added segment-specific fallback wording intended to be read verbatim when evidence is missing.
• Explicitly excluded:
  • Any application/runtime behavior changes
  • CI/workflow/auth/billing/deploy configuration changes
  • Additional docs beyond the sprint demo agenda file

Risk

• Risk level: low
• Failure mode:
  • Demo operators could still run stale commands from older docs if they do not use this updated agenda.
• Rollback:
  • Revert docs/SPRINT_DEMO_AGENDA.md to prior revision.

Verification

List exact automated and manual checks, tied to the current head SHA.

• Focused tests
• Required CI
• Review threads resolved

Production evidence

Not applicable. This PR is documentation-only and does not alter runtime paths or deployment behavior.

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

Example excerpt

| 1:00–3:00 | **Product owner: _assign_** | Enter the standard safe fixture URL... | Route becomes `/studio?video=...`. | `npm --workspace=eventrelay-web exec -- vitest run src/lib/__tests__/studio-handoff.test.ts src/lib/__tests__/home-sell-surface.test.ts` | “The Home-to-Studio handoff is implemented, but fresh passing verification is pending for this branch.” |

• Fixes Add evidence-gated sprint demo agenda with owners and results #2040

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[kk-agent]

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

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