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.

CHANGELOG.md

@@ -6,6 +6,36 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) loos
 
 ## Unreleased
 
+## 2026.06.03.0057
+
+- Build produced from commit 7e5209190ac2.
+
+## Unreleased (carried forward)
+
+## 2026.06.03.0056
+
+- Build produced from commit 7e5209190ac2.
+
+## Unreleased (carried forward)
+
+## 2026.06.03.0055
+
+- Build produced from commit 7e5209190ac2.
+
+## Unreleased (carried forward)
+
+## 2026.06.03.0047
+
+- Build produced from commit 7e5209190ac2.
+
+## Unreleased (carried forward)
+
+## 2026.06.03.0046
+
+- Build produced from commit 7e5209190ac2.
+
+## Unreleased (carried forward)
+
 ## 2026.06.03.0032
 
 - Build produced from commit c86676010532.