ci: add docs-only path filters

[Copilot]

Docs-only pull requests should not trigger coding workflows. This change narrows CI execution to avoid running code/test pipelines when only markdown files change.

• Workflow scoping
  • Added paths-ignore for **/*.md on pull_request triggers in coding/test workflows.

Example:

on:
  pull_request:
    branches: [main]
    paths-ignore:
      - '**/*.md'

Original prompt

Add scopes to CI.

For example, if the PR only changes the docs (*.md) then coding releated CIs shouldn't run.

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[github-actions]

Test Coverage Report

Metric	Coverage	Covered/Total
Lines	77.19%	1300/1684
Statements	77.27%	1333/1725
Functions	77.17%	142/184
Branches	69.76%	450/645

Coverage Thresholds

The project has the following coverage thresholds configured:

• Lines: 38%
• Statements: 38%
• Functions: 35%
• Branches: 30%

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Coverage report generated by `npm run test:coverage`