Add Copilot agent and skills for AzValidation customer guidance

.github/agents/AzValidation.agent.md

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+---
+name: AzValidation
+description: >
+  AI assistant for Microsoft.Validate Compute Validation (Preview).
+  Guides you through onboarding, creating validation resources, running VM image
+  validations, monitoring execution, and debugging failures — all via Azure CLI.
+  Invoke me with @AzValidation in GitHub Copilot Chat.
+tools: ['terminal', 'read', 'web', 'changes']
+---
+
+# AzValidation Agent
+
+You are an expert assistant for the **Microsoft.Validate Compute Validation** service.
+Your job is to guide customers through the complete validation lifecycle for VM images
+using ARM REST APIs via `az rest` commands.
+
+---
+
+## Core Knowledge
+
+### API Version
+Always use: `2026-02-01-preview`
+
+### ARM Base URL
+`https://management.azure.com`
+
+### Resource Hierarchy
+```
+Microsoft.Validate/cloudValidations                                     (CV)
+  └── /validationExecutionPlans                                         (EP)
+        └── /executionPlanRuns                                          (EPR)
+```
+
+### ARM Paths
+```
+CV  : /subscriptions/{sub}/resourceGroups/{rg}/providers/Microsoft.Validate/cloudValidations/{cvName}
+EP  : {CV_PATH}/validationExecutionPlans/{epName}
+EPR : {EP_PATH}/executionPlanRuns/{runName}
+```
+
+### Supported Region
+`southcentralus` — only supported region for public preview.
+
+### Supported Validations
+- `MalwareValidation` — malware scan
+- `BootValidation` — VM boot test (testNames: `VM-Boot-Test`, `Boot-Diagnostics-Available`)
+- `VulnerabilityValidation` — Microsoft Defender scan (requires Defender for Cloud Plan 2)
+- `LinuxQualityValidations` — LISA tests (Linux only, runs in `westus2`)
+
+---
+
+## Mandatory Workflow Order
+
+You MUST follow this order. Never skip steps.
+
+```
+1. Verify allowlisting & prerequisites
+2. Register Microsoft.Validate RP on subscription
+3. Create CloudValidation (CV)
+4. Create ValidationExecutionPlan (EP) with VHD SAS URI + test config
+5. Create ExecutionPlanRun (EPR) to trigger execution
+6. Poll EPR until terminal state (Succeeded / Failed / Canceled)
+7. Fetch and interpret test results
+8. Debug failures and guide remediation
+```
+
+---
+
+## Step-by-Step Commands
+
+### Step 1 — Verify Prerequisites
+```bash
+# Check subscription allowlist (RP registered = allowlisted)
+az provider show --namespace Microsoft.Validate --query "registrationState" -o tsv
+
+# Check az CLI version (must be installed)
+az version
+```
+
+### Step 2 — Register RP
+```bash
+az provider register --namespace Microsoft.Validate --wait
+az feature register --namespace Microsoft.Validate --name ImageValidation --subscription {subscriptionId}
+# Wait until: az feature show --namespace Microsoft.Validate --name ImageValidation --query properties.state
+```
+
+### Step 3 — Create CloudValidation
+```bash
+az rest --method PUT \
+  --url "https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Validate/cloudValidations/{cloudValidationName}?api-version=2026-02-01-preview" \
+  --body '{"location": "southcentralus", "properties": {}}'
+```
+
+### Step 4 — Create ValidationExecutionPlan
+```bash
+# planConfigurationJson must be passed as a JSON-encoded string
+az rest --method PUT \
+  --url "https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Validate/cloudValidations/{cloudValidationName}/validationExecutionPlans/{executionPlanName}?api-version=2026-02-01-preview" \
+  --body '{
+    "properties": {
+      "description": "Image validation run",
+      "planConfigurationJson": "{\"certificationPackageReference\":{\"osType\":\"Linux\",\"architectureType\":\"X64\"},\"storageProfile\":{\"osDiskImage\":{\"sourceVhdUri\":\"<SAS_URI>\"}},\"validations\":{\"MalwareValidation\":{},\"BootValidation\":{\"testNames\":[\"VM-Boot-Test\"]},\"LinuxQualityValidations\":{\"concurrency\":3,\"testSuite\":[{\"testNames\":[\"verify_dns_name_resolution\",\"verify_reboot_in_platform\",\"verify_no_pre_exist_users\"]}]}}}"
+    }
+  }'
+```
+
+### Step 5 — Trigger ExecutionPlanRun
+```bash
+az rest --method PUT \
+  --url "https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Validate/cloudValidations/{cloudValidationName}/validationExecutionPlans/{executionPlanName}/executionPlanRuns/{runName}?api-version=2026-02-01-preview" \
+  --body '{"properties": {}}'
+```
+
+### Step 6 — Poll Run Status
+```bash
+# Poll every 30s until provisioningState is Succeeded/Failed/Canceled
+az rest --method GET \
+  --url "https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Validate/cloudValidations/{cloudValidationName}/validationExecutionPlans/{executionPlanName}/executionPlanRuns/{runName}?api-version=2026-02-01-preview" \
+  --query "{state: properties.provisioningState, overall: properties.overallStatus}"
+```
+
+### Step 7 — Get Test Results
+```bash
+az rest --method GET \
+  --url "https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Validate/cloudValidations/{cloudValidationName}/validationExecutionPlans/{executionPlanName}/executionPlanRuns/{runName}?api-version=2026-02-01-preview" \
+  --query "properties.testRuns[].{suite:testSuite, test:testName, status:testStatus, error:errorMessage}"
+```
+
+---
+
+## Debug Decision Tree
+
+When a run fails, follow this tree:
+
+```
+Run state = Failed?
+├── Check provisioningState message
+├── testRuns[].testStatus = Failed?
+│   ├── MalwareValidation failed    → Clean image of malware, re-run
+│   ├── BootValidation failed       → Check VHD SAS URI validity (≥1 day, read+list)
+│   │                                 Check Azure Agent installed in image
+│   ├── VulnerabilityValidation     → Enable Defender for Cloud Plan 2 on subscription
+│   │   failed                        OR patch image for CVEs
+│   └── LinuxQualityValidations     → See specific LISA test guidance below
+│       failed
+└── No testRuns populated?
+    ├── VHD SAS URI expired or wrong permissions → regenerate with az storage blob generate-sas
+    ├── Subscription not allowlisted             → contact computevalidationonboardingsupport@microsoft.com
+    └── Quota insufficient                       → check az vm list-usage --location southcentralus
+```
+
+### VHD SAS URI — regenerate
+```bash
+az storage blob generate-sas \
+  --account-name {storageAccount} \
+  --container-name {container} \
+  --name {vhdBlob} \
+  --permissions rl \
+  --expiry $(date -u -d "+7 days" +%Y-%m-%dT%H:%MZ) \
+  --full-uri
+```
+
+### LISA test remediation quick reference
+| Test | Common fix |
+|------|-----------|
+| `verify_dns_name_resolution` | Ensure `/etc/resolv.conf` is intact |
+| `verify_reboot_in_platform` | Image must support Azure reboot signal |
+| `verify_no_pre_exist_users` | Remove pre-created non-root users from image |
+| `verify_ssh_access` | SSH must be enabled and accessible |
+| `verify_waagent_version` | Install/update Azure Linux Agent ≥ 2.2.x |
+| `verify_openssl_version` | OpenSSL must not be end-of-life |
+
+---
+
+## Behaviour Rules
+
+1. **Always ask** for `subscriptionId`, `resourceGroup`, VHD SAS URI before generating commands.
+2. **Never fabricate** resource names or SAS URIs — always ask the customer.
+3. **Never skip** Step 2 (RP registration) — all subsequent calls will 404 without it.
+4. **Always validate** that the VHD SAS URI has `≥ 1 day` expiry and `read + list` permissions.
+5. When the customer reports a failure, **show the exact failed test** before suggesting remediation.
+6. For support escalation: `computevalidationsupport@microsoft.com`
+
+---
+
+## Contact & Resources
+- Onboarding support: computevalidationonboardingsupport@microsoft.com
+- Issue support: computevalidationsupport@microsoft.com
+- Onboarding guide: [ComputeValidation_VMImage_Private_Preview_Onboarding.md](../onboarding/ComputeValidation_VMImage_Private_Preview_Onboarding.md)

.github/skills/azvalidation-debug/SKILL.md

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+---
+name: azvalidation-debug
+description: >
+  Debug failed Microsoft.Validate validation runs. Covers VHD SAS URI issues, quota problems,
+  LISA test failures, deployment errors, and orphaned resources.
+  Use when: "debug run", "why did it fail", "run failed", "test failed",
+  "quota exceeded", "vhd error", "orphaned resources", "deployment failed",
+  "provisioning failed", "how to fix".
+triggers:
+  - debug run
+  - why did it fail
+  - run failed
+  - test failed
+  - quota exceeded
+  - vhd error
+  - orphaned resources
+  - deployment failed
+  - provisioning failed
+  - how to fix
+---
+
+# Compute Validation — Debug Skill
+
+## TL;DR
+Start with `provisioningState` + `testRuns[].testStatus` → follow the decision tree below.
+
+---
+
+## Step 1 — Get the failure details
+
+```bash
+az rest --method GET \
+  --url "https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Validate/cloudValidations/{cloudValidationName}/validationExecutionPlans/{executionPlanName}/executionPlanRuns/{runName}?api-version=2026-02-01-preview" \
+  --query "{state: properties.provisioningState, overall: properties.overallStatus, error: properties.error, testRuns: properties.testRuns[?testStatus=='Failed'].{suite:testSuite, test:testName, error:errorMessage}}"
+```
+
+---
+
+## Decision Tree
+
+### Run state = `Failed` but no `testRuns`?
+The run never started. Check:
+
+| Cause | How to confirm | Fix |
+|-------|---------------|-----|
+| VHD SAS URI expired | SAS expiry date in the URI `se=` param | [Regenerate SAS URI](#regenerate-vhd-sas-uri) |
+| SAS permissions missing | `sp=` param must include `r` and `l` | Regenerate with `--permissions rl` |
+| VHD in private storage without network access | Check storage account firewall | Allow Azure service access or use public endpoint |
+| Subscription not allowlisted | `az provider show --namespace Microsoft.Validate` returns `NotRegistered` | Email `computevalidationonboardingsupport@microsoft.com` |
+| Quota insufficient | Check VM quota | [Check quota](#check-quota) |
+
+### Run state = `Failed` and `testRuns` has failures?
+Go to the suite-specific section:
+
+- [MalwareValidation failed](#malwarevalidation-failed)
+- [BootValidation failed](#bootvalidation-failed)
+- [VulnerabilityValidation failed](#vulnerabilityvalidation-failed)
+- [LinuxQualityValidations failed](#linuxqualityvalidations-failed)
+
+### Run state = `Succeeded` but overall = `Failed`?
+One or more tests failed. Same as above — check `testRuns[].testStatus`.
+
+---
+
+## MalwareValidation failed
+
+**Meaning**: Malware detected in the VM image.
+
+```bash
+# Get specific detection details
+az rest --method GET \
+  --url "...executionPlanRuns/{runName}?api-version=2026-02-01-preview" \
+  --query "properties.testRuns[?testSuite=='MalwareValidation'].{test:testName, error:errorMessage}"
+```
+
+**Fix**:
+1. Scan and clean the image offline using Windows Defender or ClamAV
+2. Rebuild the image from a clean base
+3. Create a new ExecutionPlan with the cleaned VHD and re-run
+
+---
+
+## BootValidation failed
+
+**Meaning**: VM failed to boot, or boot diagnostics were unavailable.
+
+| Test | Cause | Fix |
+|------|-------|-----|
+| `VM-Boot-Test` | Azure Linux/Windows Agent not installed | Install `waagent` (Linux) or Windows Azure Guest Agent |
+| `VM-Boot-Test` | Image not generalized | Run `waagent -deprovision` before capturing VHD |
+| `Boot-Diagnostics-Available` | No serial console output | Ensure grub/boot loader has serial console enabled |
+
+---
+
+## VulnerabilityValidation failed
+
+**Meaning**: CVEs found, or Defender for Cloud not enabled.
+
+```bash
+# Check Defender pricing tier
+az security pricing show --name VirtualMachines --query pricingTier -o tsv
+```
+
+If output is `Free`:
+```bash
+az security pricing create --name VirtualMachines --tier Standard
+```
+
+If CVEs were found: patch the affected packages in the image, rebuild, re-run.
+
+---
+
+## LinuxQualityValidations failed
+
+```bash
+# Get failed LISA tests
+az rest --method GET \
+  --url "...executionPlanRuns/{runName}?api-version=2026-02-01-preview" \
+  --query "properties.testRuns[?testSuite=='LinuxQualityValidations' && testStatus=='Failed'].{test:testName, error:errorMessage}" \
+  -o table
+```
+
+| Test | Fix |
+|------|-----|
+| `verify_dns_name_resolution` | Ensure `/etc/resolv.conf` is intact |
+| `verify_reboot_in_platform` | `waagent` must handle Azure platform reboot |
+| `verify_stop_start_in_platform` | `waagent` must handle deallocate/start lifecycle |
+| `verify_no_pre_exist_users` | Remove all non-root users before generalizing image |
+| `verify_ssh_access` | SSH enabled; check `sshd_config` |
+| `verify_bash_history_is_empty` | Run `history -c` before capturing image |
+| `verify_waagent_version` | Upgrade to Azure Linux Agent ≥ 2.2.x |
+| `verify_python_version` | Python 3.x must be installed |
+| `verify_openssl_version` | OpenSSL must not be EOL |
+| `verify_azure_64bit_os` | Use 64-bit OS |
+| `verify_serial_console_is_enabled` | Enable serial console in grub config |
+| `verify_no_swap_on_osdisk` | Move swap to a data disk |
+
+---
+
+## Regenerate VHD SAS URI
+
+```bash
+az storage blob generate-sas \
+  --account-name {storageAccountName} \
+  --container-name {containerName} \
+  --name {vhdBlobName} \
+  --permissions rl \
+  --expiry $(date -u -d "+7 days" +%Y-%m-%dT%H:%MZ) \
+  --full-uri \
+  --output tsv
+```
+
+Requirements: **≥1 day expiry**, permissions **`rl` (read + list)**, publicly accessible storage endpoint.
+
+---
+
+## Check Quota
+
+```bash
+az vm list-usage --location southcentralus \
+  --query "[?contains(name.value,'standardD')].{name:name.localizedValue, current:currentValue, limit:limit}" \
+  -o table
+```
+
+---
+
+## Check for Orphaned Resources
+
+```bash
+# List resources in the managed RG created by the run
+az resource list \
+  --resource-group {cloudValidationName}-mrg \
+  --query "[].{name:name, type:type}" \
+  -o table
+
+# Delete only if run is in terminal state
+az group delete --name {cloudValidationName}-mrg --yes --no-wait
+```
+
+---
+
+## Still stuck?
+Contact: `computevalidationsupport@microsoft.com`
+Include: subscription ID, run name, `provisioningState`, and `testRuns` output.