Add issue triage skill for GitHub issue management

.github/skills/issue-triage/SKILL.md

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+---
+name: issue-triage
+description: Queries and triages open GitHub issues that need attention. Helps identify issues needing milestones, labels, or investigation.
+metadata:
+  author: dotnet-maui
+  version: "2.1"
+compatibility: Requires GitHub CLI (gh) authenticated with access to dotnet/maui repository.
+---
+
+# Issue Triage Skill
+
+This skill helps triage open GitHub issues in the dotnet/maui repository by:
+1. Initializing a session with current milestones and labels
+2. Loading a batch of issues into memory
+3. Presenting issues ONE AT A TIME for triage decisions
+4. Suggesting milestones based on issue characteristics
+5. Tracking progress through a triage session
+
+## When to Use
+
+- "Find issues to triage"
+- "Let's triage issues"
+- "Grab me 10 issues to triage"
+- "Triage Android issues"
+
+## Triage Workflow
+
+### Step 1: Initialize Session
+
+Start by initializing a session to load current milestones and labels:
+
+```bash
+pwsh .github/skills/issue-triage/scripts/init-triage-session.ps1
+```
+
+### Step 2: Load Issues Into Memory
+
+Load a batch of issues (e.g., 20) but DO NOT display them all. Store them for one-at-a-time presentation:
+
+```bash
+pwsh .github/skills/issue-triage/scripts/query-issues.ps1 -Limit 100 -OutputFormat triage
+```
+
+### Step 3: Present ONE Issue at a Time
+
+**IMPORTANT**: When user asks to triage, present only ONE issue at a time in this format:
+
+```markdown
+## Issue #XXXXX
+
+**[Title]**
+
+🔗 [URL]
+
+| Field | Value |
+|-------|-------|
+| **Author** | username (Syncfusion if applicable) |
+| **Platform** | platform |
+| **Area** | area |
+| **Labels** | labels |
+| **Linked PR** | PR info with milestone if available |
+| **Regression** | Yes/No |
+| **Comments** | count |
+
+**Comment Summary** (if any):
+- [Author] Comment preview...
+
+**My Suggestion**: `Milestone` - Reason
+
+---
+
+What would you like to do with this issue?
+```
+
+### Step 4: Wait for User Decision
+
+Wait for user to say:
+- A milestone name (e.g., "Backlog", "SR3", ".NET 10 Servicing")
+- "yes" to accept suggestion
+- "skip" or "next" to move on without changes
+- Specific instructions (e.g., "SR4 and add regression label")
+
+### Step 5: Apply Changes and Move to Next
+
+After applying changes, automatically present the NEXT issue.
+
+## Script Parameters
+
+### query-issues.ps1
+
+| Parameter | Values | Default | Description |
+|-----------|--------|---------|-------------|
+| `-Platform` | android, ios, windows, maccatalyst, all | all | Filter by platform |
+| `-Area` | Any area label (e.g., collectionview, shell) | "" | Filter by area |
+| `-Limit` | 1-1000 | 50 | Maximum issues to fetch |
+| `-Skip` | 0+ | 0 | Skip first N issues (for pagination) |
+| `-OutputFormat` | table, json, markdown, triage | table | Output format |
+| `-RequireAreaLabel` | switch | false | Only return issues with area-* labels |
+| `-SkipDetails` | switch | false | Skip fetching PRs/comments (faster) |
+
+## Milestone Suggestion Logic
+
+| Condition | Suggested Milestone | Reason |
+|-----------|---------------------|--------|
+| Linked PR has milestone | PR's milestone | "PR already has milestone" |
+| Has `i/regression` + regressed in .NET 10 | .NET 10.0 SR3 | "Regression in .NET 10" |
+| Has `i/regression` (other) | .NET 10.0 SR4 | "Regression" |
+| Has open linked PR | .NET 10 Servicing | "Has open PR" |
+| Default | Backlog | "No PR, not a regression" |
+
+## Applying Triage Decisions
+
+```bash
+# Set milestone only
+gh issue edit ISSUE_NUMBER --repo dotnet/maui --milestone "Backlog"
+
+# Set milestone and add labels  
+gh issue edit ISSUE_NUMBER --repo dotnet/maui --milestone ".NET 10.0 SR3" --add-label "i/regression"
+
+# Set milestone on both issue AND linked PR
+gh issue edit ISSUE_NUMBER --repo dotnet/maui --milestone ".NET 10.0 SR3"
+gh pr edit PR_NUMBER --repo dotnet/maui --milestone ".NET 10.0 SR3"
+```
+
+## Common Milestone Choices
+
+| Milestone | Use When |
+|-----------|----------|
+| `.NET 10.0 SR3` | Regressions in .NET 10, critical bugs with PRs ready |
+| `.NET 10.0 SR4` | Important bugs, regressions being investigated |
+| `.NET 10 Servicing` | General fixes with PRs, non-urgent improvements |
+| `Backlog` | No PR, not a regression, nice-to-have fixes |
+
+## Label Quick Reference
+
+**Regression Labels:**
+- `i/regression` - Confirmed regression
+- `regressed-in-10.0.0` - Specific version
+
+**Priority Labels:**
+- `p/0` - Critical
+- `p/1` - High
+- `p/2` - Medium
+- `p/3` - Low
+
+**iOS 26 / macOS 26:**
+- `version/iOS-26` - iOS 26 specific issue
+
+## Session Tracking (Optional)
+
+```bash
+# Record triaged issue
+pwsh .github/skills/issue-triage/scripts/record-triage.ps1 -IssueNumber 33272 -Milestone "Backlog"
+
+# View session stats
+cat CustomAgentLogsTmp/Triage/triage-*.json | jq '.Stats'
+```

.github/skills/issue-triage/scripts/init-triage-session.ps1

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+#!/usr/bin/env pwsh
+<#
+.SYNOPSIS
+    Initializes a triage session by loading current milestones, labels, and creating a session tracker.
+
+.DESCRIPTION
+    This script prepares for an issue triage session by:
+    1. Querying all open milestones from dotnet/maui
+    2. Loading common labels for quick reference
+    3. Creating a session file to track triaged issues
+
+    Run this at the start of a triage session to have current milestone/label data available.
+
+.PARAMETER SessionName
+    Optional name for the triage session (default: timestamp-based)
+
+.PARAMETER OutputDir
+    Directory to store session files (default: CustomAgentLogsTmp/Triage)
+
+.EXAMPLE
+    ./init-triage-session.ps1
+    # Initializes a new triage session with defaults
+
+.EXAMPLE
+    ./init-triage-session.ps1 -SessionName "android-triage"
+    # Creates a named session for Android issue triage
+#>
+
+param(
+    [Parameter(Mandatory = $false)]
+    [string]$SessionName = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$OutputDir = "CustomAgentLogsTmp/Triage"
+)
+
+$ErrorActionPreference = "Stop"
+
+Write-Host "╔═══════════════════════════════════════════════════════════╗" -ForegroundColor Cyan
+Write-Host "║           Initializing Triage Session                     ║" -ForegroundColor Cyan
+Write-Host "╚═══════════════════════════════════════════════════════════╝" -ForegroundColor Cyan
+
+# Create output directory
+if (-not (Test-Path $OutputDir)) {
+    New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
+}
+
+# Generate session name if not provided
+if ($SessionName -eq "") {
+    $SessionName = "triage-$(Get-Date -Format 'yyyy-MM-dd-HHmm')"
+}
+
+$sessionFile = Join-Path $OutputDir "$SessionName.json"
+
+Write-Host ""
+Write-Host "Session: $SessionName" -ForegroundColor Green
+Write-Host "Output: $sessionFile" -ForegroundColor DarkGray
+
+# Query open milestones
+Write-Host ""
+Write-Host "Fetching open milestones..." -ForegroundColor Cyan
+
+$milestones = @()
+try {
+    $msResult = gh api repos/dotnet/maui/milestones --jq '.[] | {number, title, due_on, open_issues}' 2>&1
+    $msLines = $msResult -split "`n" | Where-Object { $_ -match "^\{" }
+
+    foreach ($line in $msLines) {
+        $ms = $line | ConvertFrom-Json
+        $milestones += [PSCustomObject]@{
+            Number = $ms.number
+            Title = $ms.title
+            DueOn = $ms.due_on
+            OpenIssues = $ms.open_issues
+        }
+    }
+
+    # Sort by title for easy reference
+    $milestones = $milestones | Sort-Object Title
+
+    Write-Host "  Found $($milestones.Count) open milestones:" -ForegroundColor Green
+
+    # Group milestones by type
+    $srMilestones = $milestones | Where-Object { $_.Title -match "SR\d|Servicing" }
+    $backlog = $milestones | Where-Object { $_.Title -eq "Backlog" }
+    $otherMs = $milestones | Where-Object { $_.Title -notmatch "SR\d|Servicing" -and $_.Title -ne "Backlog" }
+
+    Write-Host ""
+    Write-Host "  Servicing Releases:" -ForegroundColor Yellow
+    foreach ($ms in $srMilestones) {
+        $dueInfo = ""
+        if ($ms.DueOn -and $ms.DueOn -is [string] -and $ms.DueOn.Length -ge 10) {
+            $dueInfo = " (due: $($ms.DueOn.Substring(0, 10)))"
+        }
+        Write-Host "    - $($ms.Title)$dueInfo [$($ms.OpenIssues) open]"
+    }
+
+    if ($backlog) {
+        Write-Host ""
+        Write-Host "  Backlog:" -ForegroundColor Yellow
+        Write-Host "    - $($backlog.Title) [$($backlog.OpenIssues) open]"
+    }
+
+    if ($otherMs.Count -gt 0) {
+        Write-Host ""
+        Write-Host "  Other:" -ForegroundColor Yellow
+        foreach ($ms in $otherMs | Select-Object -First 5) {
+            Write-Host "    - $($ms.Title) [$($ms.OpenIssues) open]"
+        }
+        if ($otherMs.Count -gt 5) {
+            Write-Host "    ... and $($otherMs.Count - 5) more"
+        }
+    }
+}
+catch {
+    Write-Host "  Failed to fetch milestones: $_" -ForegroundColor Red
+}
+
+# Query common labels
+Write-Host ""
+Write-Host "Fetching labels..." -ForegroundColor Cyan
+
+$labels = @{
+    Platforms = @()
+    Areas = @()
+    Status = @()
+    Priority = @()
+    Regression = @()
+    Other = @()
+}
+
+try {
+    $labelResult = gh api repos/dotnet/maui/labels --paginate --jq '.[].name' 2>&1
+    $allLabels = $labelResult -split "`n" | Where-Object { $_ -ne "" }
+
+    foreach ($label in $allLabels) {
+        if ($label -match "^platform/") {
+            $labels.Platforms += $label
+        }
+        elseif ($label -match "^area-") {
+            $labels.Areas += $label
+        }
+        elseif ($label -match "^s/") {
+            $labels.Status += $label
+        }
+        elseif ($label -match "^p/") {
+            $labels.Priority += $label
+        }
+        elseif ($label -match "regression|regressed") {
+            $labels.Regression += $label
+        }
+    }
+
+    Write-Host "  Platforms: $($labels.Platforms.Count) labels"
+    Write-Host "  Areas: $($labels.Areas.Count) labels"
+    Write-Host "  Status: $($labels.Status.Count) labels"
+    Write-Host "  Priority: $($labels.Priority.Count) labels"
+    Write-Host "  Regression: $($labels.Regression.Count) labels"
+}
+catch {
+    Write-Host "  Failed to fetch labels: $_" -ForegroundColor Red
+}
+
+# Create session object
+$session = [PSCustomObject]@{
+    Name = $SessionName
+    StartedAt = (Get-Date).ToString("o")
+    Milestones = $milestones
+    Labels = $labels
+    TriagedIssues = @()
+    Stats = @{
+        Total = 0
+        Backlog = 0
+        Servicing = 0
+        SR = 0
+        Skipped = 0
+    }
+}
+
+# Save session file
+$session | ConvertTo-Json -Depth 10 | Out-File -FilePath $sessionFile -Encoding UTF8
+
+Write-Host ""
+Write-Host "═══════════════════════════════════════════════════════════" -ForegroundColor Cyan
+Write-Host ""
+Write-Host "Session initialized! Quick reference:" -ForegroundColor Green
+Write-Host ""
+Write-Host "  Common Milestones:" -ForegroundColor Yellow
+$srMilestones | ForEach-Object { Write-Host "    $($_.Title)" }
+Write-Host "    Backlog"
+Write-Host ""
+Write-Host "  Priority Labels:" -ForegroundColor Yellow
+$labels.Priority | ForEach-Object { Write-Host "    $_" }
+Write-Host ""
+Write-Host "  Regression Labels:" -ForegroundColor Yellow
+$labels.Regression | Select-Object -First 5 | ForEach-Object { Write-Host "    $_" }
+Write-Host ""
+Write-Host "  Session file: $sessionFile" -ForegroundColor DarkGray
+Write-Host ""
+Write-Host "Ready to triage! Run query-issues.ps1 to load issues." -ForegroundColor Green
+
+# Return session for pipeline usage
+return $session