Rebuild against commit 2489b7a; expand README cmdlets table with per-cmdlet synopses

Refreshed Module/PSInfisicalAPI/bin/PSInfisicalAPI.dll and Module/PSInfisicalAPI/PSInfisicalAPI.psd1 so the embedded BuildCommitHash matches the now-checked-in source (was 51bf819, now 2489b7a). CHANGELOG gains the 2026.06.04.1915 build stamp.

README cmdlets section now lists all 34 cmdlets grouped by Session/Secrets/Projects/Environments/Folders/Tags/PKI, each with the synopsis pulled verbatim from Get-Help to keep the two surfaces in sync.

Module/PSInfisicalAPI/PSInfisicalAPI.psd1

@@ -1,6 +1,6 @@
 @{
     RootModule           = 'PSInfisicalAPI.psm1'
-    ModuleVersion        = '2026.06.04.1911'
+    ModuleVersion        = '2026.06.04.1915'
     GUID                 = 'b8a2f3d4-7c51-4d2f-9e6a-1f0c8b3d4e51'
     Author               = 'Grace Solutions'
     CompanyName          = 'Grace Solutions'
@@ -55,7 +55,7 @@
             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   = '51bf819c37e5'
+            CommitHash   = '2489b7adca98'
         }
     }
 }