Add an Agent Canvas daily engineering workflow use case

[neubig]

I can

I can follow a public, end-to-end example to install and run Graham's human-in-the-loop daily engineering workflow entirely in Agent Canvas.

Scope

Add a concrete use-case page to the existing examples/use-cases documentation structure and link it from the relevant overview/navigation. The page must describe only behavior verified in the public repositories.

Acceptance criteria

• The page starts from local Agent Canvas and installs the daily-workflow skill without a CLI step.
• It walks through recommended GitHub, Linear, and Slack integration setup and connection verification.
• A normal example covers review intake, cross-source prioritization, and an explicit human approval point.
• A recovery example covers one failed integration or authored-PR problem and shows how the user regains control.
• Screenshots or equivalent live evidence match the released UI and skill behavior.
• The page explains how another user can adapt the workflow rather than presenting it as Graham-only.
• The page is linked from the docs' examples/use-cases entry point and passes docs checks.
• No private repository or Cloud-only feature is required by the walkthrough.

Dependencies

• OpenHands/agent-canvas#1798 — Canvas-only skill installation/handoff.
• OpenHands/agent-canvas#1799 — integration health and recovery.
• OpenHands/extensions#412 — GitHub/Linear/Slack validation.
• neubig/workflow#8 — runnable daily-workflow skill example.