refactor(cloud): unify cloud and serverless under single cloud namespace

[MattDevy]

Closes #193. Partial revert of #131.

Summary

Unifies elastic cloud and elastic serverless under a single top-level cloud namespace to match how customers actually think about the product (Elastic Cloud at cloud.elastic.co, with two offerings: Hosted Deployments and Serverless Projects).

New tree:

elastic cloud
├── accounts                       promoted — current-user account
├── authentication                 promoted — Cloud API keys
├── organizations                  promoted — org management
├── user-role-assignments          promoted — user role assignments
├── hosted
│   ├── deployments
│   ├── deployment-templates
│   ├── deployments-traffic-filter
│   ├── extensions
│   ├── stack                      stack versions
│   ├── trusted-environments
│   └── billing-costs-analysis
└── serverless
    ├── es/projects { list, create, get, delete, patch, resume, get-status, get-roles, reset-credentials }
    ├── observability/projects { … }
    ├── security/projects { … }
    ├── regions
    ├── traffic-filters
    ├── linked-projects
    └── linked-candidate-projects

Design notes

• Promoted to direct cloud children because they apply to both Hosted and Serverless: accounts (current-user account), authentication (Cloud API keys), organizations (org/IdP/domain-claims/invitations), user-role-assignments.
• Kept under cloud hosted: billing-costs-analysis (today's endpoints are deployment-indexed), trusted-environments (ECE/ESS-only concept).
• Codegen unchanged. src/cloud/apis/*.ts, src/cloud/apis.ts, and src/cloud/serverless-apis.ts are untouched. The restructure happens at tree-assembly time in src/cloud/register.ts.
• Clean break, no aliases. Project is 0.1.0-alpha.1 and the misleading split landed recently in fix: update readme, cloud bugs #131. Partitioning in register.ts uses two hardcoded namespace sets (PROMOTED_NAMESPACES, SERVERLESS_NAMESPACES) so synthetic-def tests partition deterministically.
• elastic es → elastic stack rename is deferred to a follow-up (orthogonal change, different codepath).

Migration

Before	After
elastic serverless es projects list	elastic cloud serverless es projects list
elastic cloud deployments list-deployments	elastic cloud hosted deployments list-deployments
elastic cloud stack get-version-stacks	elastic cloud hosted stack get-version-stacks
elastic cloud accounts get-current-account	unchanged (promoted)
elastic cloud organizations list-organizations	unchanged (promoted)

Files changed

• src/cli.ts — dropped the top-level serverless branch; updated cloud description.
• src/cloud/register.ts — single public registerCloudCommands that partitions defs into promoted / hosted / serverless and composes the tree. registerServerlessCommands removed from the public API.
• test/cloud/register.test.ts — rewritten for the unified tree; simplifyProjectCommandName unit tests retained.
• README.md — cloud and serverless sections collapsed into one cloud section.
• test/functional/cloud/smoke.sh — paths updated to new tree (the file was also out of sync with post-fix: update readme, cloud bugs #131 paths).

Test plan

• npx tsc --noEmit passes.
• npm run test:unit — 797/797 passing (24 register-specific tests cover top-level tree, promoted namespaces, hosted subgroup, serverless subgroup, synthetic-def partitioning, validation, duplicate detection, --wait on create-project, absence of aliases).
• npm run test:lint clean.
• elastic cloud --help lists accounts, authentication, organizations, user-role-assignments, hosted, serverless and nothing else.
• elastic cloud serverless es projects --help shows short-name leaves (list, create, get, delete, patch, resume, get-status, get-roles, reset-credentials).
• Top-level help no longer shows serverless.
• Functional smoke (npm run test:functional:cloud) against a real Cloud context — reviewer with creds to verify.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	2.94s
✅ REPOSITORY	gitleaks	yes		no	no	8.2s
✅ REPOSITORY	git_diff	yes		no	no	0.02s
✅ REPOSITORY	secretlint	yes		no	no	2.16s
✅ REPOSITORY	trivy	yes		no	no	14.33s
✅ TYPESCRIPT	eslint	3		0	0	2.04s

See detailed reports in MegaLinter artifacts
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

MegaLinter is graciously provided by OX Security
Show us your support by starring ⭐ the repository

[JoshMock]

LGTM. Just double-checked that register.ts is not part of code generation, so no changes needed on that side.