ci: allow selecting exact PR E2E tests

[jesseturner21]

Description

Allow maintainers to manually run a specific E2E test against a PR head.

• Add pr_number, test_selector, and test_name_pattern workflow-dispatch inputs.
• Support Vitest file.test.ts:line selectors for an exact test declaration.
• Validate selectors against tracked E2E test files and safely construct Vitest arguments as Bash arrays.
• Route selected tests to the existing GA or harness runner while preserving automatic baseline and changed-file behavior.
• Document the PR test-selection workflow.

Related Issue

Closes #1816

Documentation PR

N/A - documentation is included in this PR.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

• Parsed the workflow as YAML.

• Parsed every embedded workflow run block with bash -n.

• Verified formatting with Prettier.

• Exercised GA and harness selector routing, invalid selector rejection, orphan name-pattern rejection, PR checkout resolution, and invalid PR-number rejection.

• Verified Vitest file:line behavior with a two-test smoke fixture: the selected test passed and the deliberately failing unselected test was skipped.

• I ran npm run test:unit and npm run test:integ

• I ran npm run typecheck

• I ran npm run lint

• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the
terms of your choice.

[github-actions]

Package Tarball

aws-agentcore-0.24.1.tgz

How to install

gh release download pr-1817-tarball --repo aws/agentcore-cli --pattern "*.tgz" --dir /tmp/pr-tarball
npm install -g /tmp/pr-tarball/aws-agentcore-0.24.1.tgz

[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	40.3%	15047 / 37333
🔵	Statements	39.56%	16037 / 40535
🔵	Functions	34.42%	2567 / 7457
🔵	Branches	33.71%	10016 / 29710

Generated in workflow #4187 for commit df1dccb by the Vitest Coverage Report Action