feat(scale-set): add service controller

[edersonbrilhante]

Description

Adds the scale-set service controller, GitHub scale-set client library, and EC2 scale-set capability under lambdas/**.

Builds on the neutral EC2 runner creation result from #5312. This PR owns the scale-set-specific orchestration tags and their validation, adds the explicit scale-set-service runner source, and binds each reconciliation request's abort signal before launch, tag, or terminate work.

Splits the EC2 scale-set logic into configuration, inventory, reconciliation, scale-up, and scale-down contexts, with provider.ts as the public facade and matching context-focused tests.

Aligns message handling with the upstream actions/scaleset listener: acknowledge before job acquisition and reconciliation, treat provider failures after acknowledgement as fatal for that reconciler, and keep transport and session recovery separate. Scale-set consumes neutral failed-instance counts and does not inherit the webhook/SQS retry policy.

Normalizes GitHub and Actions service URL paths with linear scans, avoiding regular-expression denial-of-service risks on uncontrolled input while preserving invalid-path rejection.

Documentation and CI workflow changes are in follow-up #5347.

Test Plan

• Compute-provider suite: 21 files, 348 tests passed.
• Control-plane suite: 14 files, 345 tests passed.
• GitHub scale-set client: 4 files, 40 tests passed.
• Scale-set service: 9 files, 67 tests passed.
• TypeScript type-checks passed for control-plane, GitHub scale-set client, and scale-set service.
• ESLint and Prettier passed for the changed TypeScript package scopes.
• git diff --check and pre-commit checks passed.

Related Issues

Depends on #5312.

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 3 package(s) with unknown licenses.

See the Details below.

License Issues

lambdas/services/scale-set/package.json

Package	Version	License	Issue Type
@aws-github-runner/aws-ssm-util		Null	Unknown License
@aws-github-runner/compute-providers		Null	Unknown License
@aws-github-runner/github-actions-scale-set		Null	Unknown License

OpenSSF Scorecard

Scorecard details

Package	Version	Score	Details
npm/@aws-sdk/client-ssm	^3.1009.0	Unknown	Unknown
npm/@types/node	^22.19.3	Unknown	Unknown
npm/typescript	^5.9.3	Unknown	Unknown
npm/@aws-github-runner/aws-ssm-util		Unknown	Unknown
npm/@aws-github-runner/compute-providers		Unknown	Unknown
npm/@aws-github-runner/github-actions-scale-set		Unknown	Unknown
npm/@aws-sdk/client-ssm	^3.1009.0	Unknown	Unknown
npm/@octokit/auth-app	8.2.0	🟢 6.8	Details Check Score Reason Code-Review 🟢 10 all changesets reviewed Security-Policy 🟢 9 security policy file detected Maintained 🟢 5 7 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 5 Binary-Artifacts 🟢 10 no binaries found in the repo Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Pinned-Dependencies 🟢 4 dependency not pinned by hash detected -- score normalized to 4 Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Fuzzing ⚠️ 0 project is not fuzzed License 🟢 10 license file detected Signed-Releases ⚠️ -1 no releases found Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Packaging 🟢 10 packaging workflow detected SAST 🟢 10 SAST tool is run on all commits
npm/@octokit/request	^9.2.2	Unknown	Unknown
npm/@types/node	^22.19.3	Unknown	Unknown
npm/@vercel/ncc	0.38.4	🟢 6.8	Details Check Score Reason Code-Review 🟢 10 all changesets reviewed Maintained 🟢 5 5 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 5 Packaging ⚠️ -1 packaging workflow not detected Token-Permissions 🟢 9 detected GitHub workflow tokens with excessive permissions Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Pinned-Dependencies 🟢 3 dependency not pinned by hash detected -- score normalized to 3 Binary-Artifacts 🟢 10 no binaries found in the repo CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Fuzzing ⚠️ 0 project is not fuzzed License 🟢 10 license file detected Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: githubv4.Query: Resource not accessible by integration Signed-Releases ⚠️ -1 no releases found Security-Policy 🟢 10 security policy file detected SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0
npm/typescript	^5.9.3	Unknown	Unknown
npm/undici	^6.19.2	Unknown	Unknown
npm/undici	6.28.0	🟢 7.8	Details Check Score Reason Dependency-Update-Tool 🟢 10 update tool detected Maintained 🟢 10 30 commit(s) and 7 issue activity found in the last 90 days -- score normalized to 10 Security-Policy 🟢 10 security policy file detected Code-Review 🟢 5 Found 14/25 approved changesets -- score normalized to 5 Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Binary-Artifacts 🟢 8 binaries present in source code License 🟢 10 license file detected CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Pinned-Dependencies 🟢 6 dependency not pinned by hash detected -- score normalized to 6 Signed-Releases ⚠️ -1 no releases found Vulnerabilities 🟢 7 3 existing vulnerabilities detected SAST 🟢 10 SAST tool is run on all commits Fuzzing 🟢 10 project is fuzzed Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Packaging 🟢 10 packaging workflow detected CI-Tests 🟢 10 19 out of 19 merged PRs checked by a CI test -- score normalized to 10 Contributors 🟢 10 project has 63 contributing companies or organizations

Scanned Files

• lambdas/libs/compute-providers/package.json
• lambdas/libs/github-actions-scale-set/package.json
• lambdas/services/scale-set/package.json
• lambdas/yarn.lock