Request-InfisicalCertificate + PKI lifecycle, MAML help for all 39 cmdlets, chain-store routing fix

Cmdlets added: Request-InfisicalCertificate, Get-InfisicalCertificate, Get-InfisicalCertificates. Request supports BySubscriber/ByCa parameter sets, BouncyCastle CSR generation (RSA/ECDSA/Ed25519), local-key generation, -Install/-InstallChain (chain certs routed to Root vs CertificateAuthority by self-signed status), idempotency reuse with -AllowRenewal/-RenewalThresholdDays, local chain reconstruction with -LocalChainOnly opt-out, Infisical bundle fallback when local stores are incomplete, and private-key protection modes (Exportable/LocalOnly/NonExportable/Ephemeral) via -PrivateKeyProtection plus -PersistKey/-MachineKey/-PrivateKeyPath.

Install-InfisicalCertificate fix: chain certs were previously dumped into CertificateAuthority unconditionally. They are now routed by Subject==Issuer (self-signed -> Root, otherwise -> CertificateAuthority), matching Request-InfisicalCertificate. Routing centralized in InfisicalCertificateRequestHelpers.GetChainCertificateTargetStore and a new InstallChain(IEnumerable<X509Certificate2>,...) overload.

Help: authored Module/PSInfisicalAPI/en-US/PSInfisicalAPI.dll-Help.xml covering all 39 cmdlets (synopsis, description, notes, two examples per cmdlet: one-liner + OrderedDictionary splat with preceding Get- resolvers for IDs/slugs).

Build pipeline: build.ps1 stages the help XML into bin/<culture>/ next to the DLL during publish (hard-fails if missing or has zero <command:command> entries). Test-ModuleImports now enumerates every exported cmdlet via Get-Command, cross-checks against expected names, and asserts non-empty synopsis (rejecting auto-generated cmdlet-name fallback), non-empty description, and at least one example with a non-empty <dev:code> block.

Tests: 230/230 passing (up from 190).

Module/PSInfisicalAPI/PSInfisicalAPI.psd1

@@ -1,6 +1,6 @@
 @{
     RootModule           = 'PSInfisicalAPI.psm1'
-    ModuleVersion        = '2026.06.04.0123'
+    ModuleVersion        = '2026.06.04.1825'
     GUID                 = 'b8a2f3d4-7c51-4d2f-9e6a-1f0c8b3d4e51'
     Author               = 'Grace Solutions'
     CompanyName          = 'Grace Solutions'
@@ -41,7 +41,10 @@
         'Update-InfisicalTag',
         'Remove-InfisicalTag',
         'Get-InfisicalCertificateAuthority',
+        'Get-InfisicalCertificate',
+        'Get-InfisicalCertificates',
         'Search-InfisicalCertificate',
+        'Request-InfisicalCertificate',
         'ConvertTo-InfisicalCertificate',
         'Install-InfisicalCertificate',
         'Uninstall-InfisicalCertificate',
@@ -57,7 +60,7 @@
             LicenseUri   = 'https://www.gnu.org/licenses/agpl-3.0.html'
             ProjectUri   = 'https://prod.git.gracesolution.info/gsadmin/PSInfisicalAPI'
             ReleaseNotes = 'See CHANGELOG.md in the project repository for release history.'
-            CommitHash   = '2cbd5c2008f5'
+            CommitHash   = '19615363e356'
         }
     }
 }