Add issue triage actions (#49828)

## Summary of the Pull Request

Replaces the retired GitHub Models-based automatic issue triage and
deduplication flows with the GitHub Agentic Workflow proven in the
`niels9001/powertoys-ai-triage-sandbox`.

This PR also:

- aligns `Needs-Author-Feedback` closure to 7 days for issues and PRs;
- removes the automatic GitHub Models issue/PR labeler;
- removes the automatic GitHub Models new-issue deduplicator;
- removes the Azure Pipelines XAML Styler verification step while
retaining the
  local styling script.

This is a draft because production rollout still requires the
appropriate
privacy and Responsible AI reviews.

## Issue triage rules

### Triggers and refresh behavior

- Runs when an issue is opened, edited, or reopened.
- Runs when the issue author attaches a `PowerToysReport_*.zip` in a
comment.
- Maintainers can force regeneration with `/triage refresh`.
- Ignores unrelated comments, unchanged issue edits, PR comments, and
  bot-initiated reopens.
- Uses per-issue concurrency so a newer run supersedes an older run.
- Maintains one canonical triage comment instead of adding repeated bot
  comments.

### Comment format

- Separates **For the issue author** from **For the PowerToys team**.
- Mentions the author once and lists each requested action as a bullet.
- Distinguishes blocking **Needed** actions from non-blocking
**Recommended**
  actions.
- Shows the product, issue kind, reported PowerToys version, concise
summary,
  diagnostic findings, possible duplicates, and collapsed investigation
  checks.
- Ends with a short disclosure that triage is AI-assisted and
maintainers make
  final decisions.

### Classification and labels

- Detects PowerToys bug-template issues deterministically.
- Reads the selected product area and adds a matching primary
`Product-*`
  label.
- Handles production aliases such as FancyZones Editor and File Explorer
  preview/thumbnail areas.
- Product labeling is additive: existing product and maintainer labels
are
  never removed.
- Normalizes the reported PowerToys version and adds a matching version
label
  when one exists.
- Applies `Needs-Author-Feedback` only when blocking information or an
English
  translation is required.
- Removes `Needs-Author-Feedback` when the issue becomes actionable.

### PowerToys version rule

- Compares the reported version with the latest stable PowerToys GitHub
  release.
- Older versions receive a recommended update-and-retest action.
- Current versions, newer preview/dev versions, missing versions, and
release
  lookup failures are not flagged as outdated.
- Updating is advisory and does not block triage by itself.

### Reproduction rule

- Concrete actions plus an observed result are sufficient.
- Concise steps can use the separate Actual Behavior section as the
observed
  result.
- Passive or intermittent failures are sufficient when the
timing/trigger and
  observed failure are clear.
- Vague statements without an actionable scenario remain insufficient.
- Clearly non-English steps are not treated as missing; reproduction is
  reassessed after the author translates the issue.

### Language rule

- Classifies author-written prose as English, non-English, or uncertain.
- Ignores template headings, code, logs, filenames, URLs, hidden
comments, and
  quoted text.
- Clearly non-English issues ask the author to translate the title and
  description to English.
- Short, mixed, code-heavy, or uncertain text is not flagged.

### Diagnostic report rule

- A report is **required** for diagnostic-heavy failures: crashes,
hangs,
startup/load failures, installation/update failures, performance
failures,
  and service/driver/shell-integration failures.
- A report is **optional** for clear reproducible UI/visual defects.
- A report is **recommended**, but not blocking, for other actionable
bugs.
- Missing or rejected reports block only when the deterministic
requirement is
  `REQUIRED`.

### Diagnostic report privacy and safety

- Accepts only PowerToys report attachment URLs matching the expected
pattern.
- Enforces archive size, decompressed size, file-count, per-file, path
  traversal, and encryption limits.
- Selects only bounded relevant metadata and product-log evidence.
- Redacts email addresses, IP addresses, user paths, URLs, GUIDs, SIDs,
  identity fields, tokens, secrets, and passwords.
- Sends only the sanitized evidence to Copilot.
- Never sends the raw ZIP or extracted files to Copilot, logs,
artifacts, or
  repository storage.
- Deletes the temporary archive after processing.

### Duplicate rule

- Searches only older issues using focused product, title/body, and
exact
  technical-signal queries.
- Ranks candidates deterministically before Copilot runs.
- Copilot judges only the supplied candidates and returns at most five
  high-confidence matches.
- Similar product area alone is not enough; the underlying request or
failure
  must match.
- The model never closes an issue directly.
- The workflow submits the strongest match as a native GitHub
duplicate-close
  suggestion.
- **When a maintainer accepts the suggestion, GitHub automatically
closes the
  issue as a duplicate and links it to the selected canonical issue.**
- Declining the suggestion leaves the issue open.
- A defensive safeguard reopens the issue and fails the run if GitHub
applies
  the close without holding it for review.

### AI cost and permission controls

- Uses the `small` model alias.
- Maximum 5 turns and 10 AI credits per run.
- Maximum 300 AI credits per day.
- Maximum 5 runs per user per 60-minute window.
- Content hashing skips unchanged work before inference.
- The agent receives only `contents: read`, `issues: read`, and
  `copilot-requests: write`.
- A separate validated safe-output job receives `issues: write`.

## Seven-day author-feedback lifecycle

The existing Microsoft GitHub Policy Service configuration remains
responsible
for stale closure:

- Open issues with `Needs-Author-Feedback` and no activity for 7 days
are
  closed with an explanatory comment.
- Open PRs with `Needs-Author-Feedback` and no activity for 7 days are
closed
  with an explanatory comment.
- An author comment removes `Needs-Author-Feedback` and returns the
issue/PR to
  team triage.
- An author push removes `Needs-Author-Feedback` from a PR.
- Manually removing the label immediately makes the issue or PR
ineligible for
  scheduled closure.

## Deprecated automation

- Deletes `.github/workflows/automatic-issue-deduplication.yml`.
- Deletes `.github/workflows/auto-labeler.yml`.
- Automatic PR product labeling from the old Models workflow is
intentionally
not replaced in this PR; a production PR ownership/path map should be
agreed
  separately.
- Keeps the manual batch deduplication workflow unchanged.
- Removes the passive XAML Styler verification step from
  `.pipelines/v2/templates/job-build-project.yml`.
- Keeps `.pipelines/applyXamlStyling.ps1` available for local developer
use.

## Validation Steps Performed

- Compiled `.github/workflows/issue-triage.md` with `gh aw compile`.
- Ran 32 focused Python tests for issue parsing, duplicate retrieval,
version
checks, reproduction rules, language signals, archive validation, report
  selection, redaction, and output privacy.
- Parsed the changed workflow and resource-management YAML.
- Verified the required production labels exist.
- Tested the workflow against the latest 20 PowerToys issues in the
sandbox;
  all 20 produced one canonical comment.
- Verified live variants for outdated versions, intermittent/passive
reproduction, non-English issues, rejected and analyzed reports,
optional UI
  reports, and title-only issues.

## PR Checklist

- [ ] **Communication:** Discussed with core contributors.
- [x] **Tests:** Added/updated and all focused tests pass.
- [ ] **Privacy / Responsible AI:** Complete required production reviews
before
  enabling.
- [x] **Localization:** No product UI strings are added.
- [x] **Dev docs:** Updated repository automation documentation.
- [x] **New binaries:** None.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 18a9b8ad-fd7e-4b9d-a06c-5e350bcde9d7
Copilot-Session: fd512b9b-db6f-4004-a65b-aa49404d568d

.pipelines/v2/templates/job-build-project.yml

@@ -220,10 +220,6 @@ jobs:
     - task: VisualStudioTestPlatformInstaller@1
       displayName: Ensure VSTest Platform
 
-  - pwsh: |-
-      & '.pipelines/applyXamlStyling.ps1' -Passive
-    displayName: Verify XAML formatting
-
   - task: NuGetAuthenticate@1
     displayName: Authenticate NuGet feeds for verification