Add lazy API version negotiation (v4 -> v3 fallback) with -ApiVersion override

- Endpoint registry now stores ordered candidate lists per logical operation; Get/TryGet preserve prior behavior, new GetCandidates(name) exposes the ladder. Added v3 fallbacks (/api/v3/secrets/raw and /api/v3/secrets/raw/{secretName}) after v4. - InfisicalConnection gains PinnedApiVersion and a ResolvedEndpointVersions cache so the chosen version sticks for the session. - InfisicalSecretsClient.SendWithVersionFallback walks candidates in pin -> cached -> registry order, falls back on routing-style failures (404 without an Infisical JSON envelope, 405, or 400 mentioning workspaceId/projectSlug) when no version is pinned, and surfaces real application errors immediately. - Get-InfisicalSecret(s) expose -ApiVersion; Connect-Infisical sets PinnedApiVersion only when -ApiVersion is explicitly bound on the command line (env-var/default values do not pin). - Logger.Error routes via WriteWarning to avoid premature terminating errors that masked InfisicalApiException details; EnsureSuccess no longer redacts non-2xx bodies so server error envelopes are visible. - InfisicalSecretsClient sends both projectId and workspaceId so it works against both new and legacy server-side validators.

Module/PSInfisicalAPI/PSInfisicalAPI.psd1

@@ -1,6 +1,6 @@
 @{
     RootModule           = 'PSInfisicalAPI.psm1'
-    ModuleVersion        = '2026.06.03.0032'
+    ModuleVersion        = '2026.06.03.0057'
     GUID                 = 'b8a2f3d4-7c51-4d2f-9e6a-1f0c8b3d4e51'
     Author               = 'Grace Solutions'
     CompanyName          = 'Grace Solutions'
@@ -27,7 +27,7 @@
             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   = 'c86676010532'
+            CommitHash   = '7e5209190ac2'
         }
     }
 }