[serena256]

What and why

Add simple title-based issue labeling:

• Match keywords to area and platform labels.
• Automatically label newly opened issues using trusted default-branch code.
• Provide a one-time backfill command that previews by default and requires
  --apply to make changes.
• Preserve existing labels and label descriptions/colors.
• Document the rules, commands, permissions, and limitations.

Editing or reopening issues does not trigger labeling. No live backfill was
applied, and this PR does not change the OpenVMM pin.

Validation

Run locally on Windows:

• python -m unittest scripts.test_label_issues -v — passed, 12 tests.
  Covers matching, preview safety, additive labeling, failures, and workflow wiring.
  GitHub calls are mocked.
• python -m ruff check scripts\label_issues.py scripts\test_label_issues.py — passed.
• python -m ruff format --check scripts\label_issues.py scripts\test_label_issues.py — passed.
• python -m pyright --pythonplatform Windows scripts\label_issues.py scripts\test_label_issues.py — passed.
• python -m pyright --pythonplatform Linux scripts\label_issues.py scripts\test_label_issues.py — passed.
• python scripts\check_markdown_links.py — passed.
• python scripts\check_test_layout.py — passed.
• python scripts\check_test_changes.py --base origin/dev — passed;
  reports 17 additions and no changes to existing tests.
• git diff --check origin/dev...HEAD — failed: trailing whitespace on
  lines 29–30 of scripts/label_issues.py; needs cleanup.

The CI validation action now includes the new test module in both platform
test lists. No existing test behavior was changed.

actionlint is unavailable locally. Full local gates, live GitHub workflow
execution, and native Linux execution were not run. No VM or backend tests
were needed.

[Copilot]

🟡 Changes recommended

Incompatible gh api --slurp --jq options break backfill and opened-issue labeling, while concurrent label creation can also abort labeling on an unhandled HTTP 422 conflict.

2 open issues

• Remove incompatible --slurp and --jq combination · New
• Handle concurrent label-creation conflicts · New

What changed in this PR

Adds title-based issue labeling to NVX’s repository automation, with automatic labeling for newly opened issues and a preview-first backfill command.

Changes:

• Matches title keywords to area and platform labels while preserving existing labels and metadata.
• Adds an issue-opened workflow using trusted default-branch code and limited permissions.
• Adds mocked tests to Linux and Windows validation and documents usage and limitations.

File	Description
scripts/​test_label_issues.py	Tests matching, preview safety, additive labeling, failures, and workflow wiring.
scripts/​label_issues.py	Implements keyword matching, GitHub label operations, and backfill commands.
doc/​ci.md	Documents labeling rules, commands, permissions, and limitations.
.github/​workflows/​label-issues.yml	Runs labeling when an issue opens.
.github/​actions/​validate-nvx/​action.yml	Adds labeling tests to Linux and Windows validation.

_{Review effort: Balanced}

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