[dotnet-port-api] Add TodoProvider session helpers

[github-actions]

Summary

Add session-first TodoProvider read helpers in Go with GetAllTodos(*agent.Session) and GetRemainingTodos(*agent.Session), while keeping the existing option-based helpers as compatibility wrappers. This ports the narrow public API portion of the upstream .NET todo provider graduation work so the Go harness exposes direct session-based todo reads, and it updates focused tests plus the parity comparison doc.

Ported .NET PRs

• .NET: [BREAKING] Graduate todo and agent mode providers out of experimental agent-framework#7052 - Graduate mode and todo providers (e57f046d8a248869fad1a2c0ea6761345efce852, microsoft/agent-framework@e57f046)

Breaking Changes

No. Existing GetAllItems and GetRemainingItems helpers remain available; this change only adds the session-first exported helpers.

Tests and Examples

• go test ./agent/harness/todo
• go test -race ./agent/harness/todo
• Added focused tests for session-based todo reads and nil-session behavior.
• No examples updated; this upstream change was a narrow helper API addition.

Notes

• Skipped the broader AgentMode portion of upstream PR #7052 because open tracking issue [dotnet-port-api] Align agentmode session helpers #568 already covers that area.
• Left the remaining graduation work from #7052 and larger harness changes for separate PRs to keep this nightly port small and reviewable.

Generated by .NET to Go API Porting Agent · 599.5 AIC · ⌖ 58 AIC · ⊞ 21.7K · ◷

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From 2a46b67630442a206135a2bde9a8b3db78612a68 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Tue, 21 Jul 2026 06:21:52 +0000
Subject: [PATCH] [dotnet-port-api] Add TodoProvider session helpers

Port the session-first TodoProvider read helpers from upstream .NET so Go exposes direct session-based access alongside the existing option-based helpers.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 agent/harness/todo/todo.go               | 89 +++++++++++++-----------
 agent/harness/todo/todo_test.go          | 55 ++++++++++++++-
 docs/dotnet-go-sdk-feature-comparison.md |  2 +-
 3 files changed, 102 insertions(+), 44 deletions(-)

diff --git a/agent/harness/todo/todo.go b/agent/harness/todo/todo.go
index 73df2df00..d96bb70eb 100644
--- a/agent/harness/todo/todo.go
+++ b/agent/harness/todo/todo.go
@@ -124,29 +124,31 @@ func (p *Provider) Invoked(ctx context.Context, invoked agent.InvokedContext) er
 
 // GetAllItems returns all todo items from the session state.
 func (p *Provider) GetAllItems(opts ...agent.Option) []Item {
-	mu := p.getSessionLock(opts)
-	mu.Lock()
-	defer mu.Unlock()
-	st := p.loadState(opts)
-	result := make([]Item, len(st.Items))
-	copy(result, st.Items)
-	return result
+	return p.GetAllTodos(sessionFromOptions(opts))
 }
 
 // GetRemainingItems returns only the incomplete todo items from the session state.
 func (p *Provider) GetRemainingItems(opts ...agent.Option) []Item {
-	mu := p.getSessionLock(opts)
+	return p.GetRemainingTodos(sessionFromOptions(opts))
+}
+
+// GetAllTodos returns all todo items stored in session.
+func (p *Provider) GetAllTodos(session *agent.Session) []Item {
+	mu := p.getSessionLock(session)
 	mu.Lock()
 	defer mu.Unlock()
-	st := p.loadState(opts)
-	return remainingItems(st.Items)
+	return copyItems(p.loadState(session).Items)
 }
 
-func (p *Provider) loadState(opts []agent.Option) *state {
-	session, ok := agent.GetOption(opts, agent.With
... (truncated)