Add a todo-harness agent example

[PratikDhanave (PratikDhanave)]

Continuing the harness sample coverage (after the loop-harness example): Go supports the todo harness (agent/harness/todo) but examples/ has no sample for it, unlike the .NET Harness samples.

Change

• New examples/02-agents/harness/step02_todo that attaches the todo context provider to a Foundry agent. The provider exposes todo tools and injects the current todo list each turn, so the agent plans a multi-step task (a three-course dinner) as todo items and completes them one by one (session-backed, so it runs inside a session).
• Registered in cmd/verifyexamples (env-gated on FOUNDRY_PROJECT_ENDPOINT), skipping cleanly without credentials.

Builds, go vet, gofumpt clean; the verifyexamples test passes and the entry is discovered and skips without credentials.

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review comments remain, and all reviewed changes are covered.

Review effort: Lite
Findings: None

What changed in this PR

Adds a Go example demonstrating the session-backed todo harness with a Foundry agent.

Changes:

• Adds a three-course dinner planning example using todo tools.
• Registers the example with environment-gated verification.

File	Description
examples/​02-agents/​harness/​step02_todo/​main.go	Demonstrates todo context-provider usage.
cmd/​verifyexamples/​examples.go	Registers the sample for verification.

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[github-actions]

Scope: examples

Changed Go contract: None. This PR only adds a new example (examples/02-agents/harness/step02_todo/main.go) and a corresponding entry in cmd/verifyexamples/examples.go. It uses the existing, unchanged agent/harness/todo package (todo.New, todo.Options) that already ships in this repo (introduced prior to this PR) — no exported symbols, option shapes, or defaults were added or modified.

Upstream evidence reviewed:

• Python: python/packages/core/agent_framework/_harness/_todo.py (todo harness context provider), sample coverage under python/samples/02-agents/harness/console/commands/todo_handler.py.
• .NET: dotnet/src/Microsoft.Agents.AI/Harness/Todo/TodoProvider.cs, TodoProviderOptions.cs, TodoItem.cs, with sample usage in dotnet/samples/02-agents/Harness/Harness_Shared_Console/Commands/TodoCommandHandler.cs and ToolFormatters/TodoToolFormatter.cs (todo functionality is exposed as part of the shared harness console rather than a single standalone step sample).
• Go already has a related, more elaborate sample combining agentmode + todo providers at examples/02-agents/agents/step23_planning_with_todos/main.go, demonstrating the same todo.New API this PR exercises in a simpler standalone form.

Result: aligned. This is a pure example addition (plus test-harness registration) with an env-gated Foundry credential requirement, consistent with other harness examples. No public API, defaults, or runtime behavior changed. Go's todo-harness sample coverage is a reasonable, idiomatic complement to the equivalent upstream Python/.NET todo-tooling surfaces — no cross-repo parity issues found.

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