.NET: Add Foundry Deployment docs to HA sample READMEs

[alliscode]

…agent samples

This commit adds comprehensive deployment documentation to all 13 .NET Foundry hosted agent samples that were missing it. Each sample now includes:

• Instructions to initialize an azd project from the sample's agent.manifest.yaml
• Steps to deploy using 'azd deploy'
• Example environment variable overrides for customization
• Link to the official Foundry deployment guide

Samples updated:

• Hosted-LocalTools
• Hosted-Files
• Hosted-FoundryAgent
• Hosted-McpTools
• Hosted-Observability
• Hosted-MemoryAgent
• Hosted-TextRag
• Hosted-ToolboxMcpSkills
• Hosted-AzureSearchRag
• Hosted-AgentSkills
• Hosted-Workflow-Handoff
• Hosted-Workflow-Simple
• Hosted-Invocations-EchoAgent

Each section includes the correct agent name from the sample's manifest and points to the correct GitHub URL for initializing the azd project.

Fixes: #6308

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[github-actions]

Automated Code Review

Reviewers: 4 | Confidence: 61%

✓ Correctness

This documentation-only PR adds deployment instructions to 14 README files. All referenced agent.manifest.yaml and agent.yaml files exist at the documented paths. The AGENT_NAME values used in the azd env set examples match the name: field in each sample's agent.manifest.yaml. URLs point to correct GitHub paths. No correctness issues found.

✓ Security Reliability

This PR adds deployment documentation sections to 14 .NET Foundry hosted agent sample READMEs. All changes are purely documentation (markdown). The referenced agent.manifest.yaml files exist at the paths specified in the URLs. No code changes, no secrets exposure, no injection risks, and no reliability concerns. The documentation correctly points users to official Microsoft Learn guides and uses standard azd CLI commands.

✓ Test Coverage

This PR adds only documentation (README.md sections) to 14 sample projects describing how to deploy to Foundry using azd. There are no code changes, no new behavior, no modified logic, and no testable surface area. Test coverage review is not applicable to pure markdown documentation additions.

✗ Design Approach

The new deployment docs are mostly consistent, but one sample now has two conflicting deployment instructions. In Hosted-AgentSkills, the newly added generic azd block omits the sample-specific SKILL_NAMES requirement that the same README already documents and that the manifest declares as a deployment parameter, so the current approach no longer addresses this sample’s deployment story in a single consistent way.

Flagged Issues

• dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-AgentSkills/README.md now has conflicting deployment guidance: the pre-existing section says SKILL_NAMES must be set for deployment (lines 99-104), and agent.manifest.yaml:28-37 declares it as a manifest parameter, but the new azd block only shows AGENT_NAME and AZURE_AI_MODEL_DEPLOYMENT_NAME.

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Automated review by alliscode's agents

[Copilot]

Pull request overview

This PR adds Azure Developer CLI (azd) deployment guidance to the .NET Foundry Hosted Agent sample READMEs, helping readers initialize from each sample’s agent.manifest.yaml and deploy with azd deploy.

Changes:

• Added a “Deploying to Foundry (azd spec)” section across the Hosted Agent samples with azd ai agent init + azd deploy steps.
• Added example azd env set ... overrides and a link to the official hosted-agent deployment guide.
• Standardized the deployment snippet shape across the touched READMEs (responses + invocations).

Show a summary per file

File	Description
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Workflow-Simple/README.md	Adds azd-based Foundry deployment steps for the simple workflow sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Workflow-Handoff/README.md	Adds azd-based Foundry deployment steps for the handoff workflow sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-ToolboxMcpSkills/README.md	Adds azd-based Foundry deployment steps for the Toolbox MCP Skills sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-TextRag/README.md	Adds azd-based Foundry deployment steps for the Text RAG sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/README.md	Adds azd-based Foundry deployment steps for the observability sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-MemoryAgent/README.md	Adds azd-based Foundry deployment steps for the memory sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-McpTools/README.md	Adds azd-based Foundry deployment steps for the MCP tools sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-LocalTools/README.md	Adds azd-based Foundry deployment steps for the local tools sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-FoundryAgent/README.md	Adds azd-based Foundry deployment steps for the Foundry-managed agent sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Files/README.md	Adds azd-based Foundry deployment steps for the files sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-ChatClientAgent/README.md	Adds azd-based Foundry deployment steps for the chat-client sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-AzureSearchRag/README.md	Adds azd-based Foundry deployment steps for the Azure AI Search RAG sample.
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-AgentSkills/README.md	Adds azd-based Foundry deployment steps for the Agent Skills sample.
dotnet/samples/04-hosting/FoundryHostedAgents/invocations/Hosted-Invocations-EchoAgent/README.md	Adds azd-based Foundry deployment steps for the invocations echo sample.

Copilot's findings

• Files reviewed: 14/14 changed files
• Comments generated: 3