feat(process): add Start-InfisicalProcess with event-based capture and friendly TimeSpan logging

- New cmdlet Start-InfisicalProcess: launches a child process with InfisicalSecret
  objects decrypted directly into ProcessStartInfo.Environment (optional -Prefix),
  additional -EnvironmentVariables, stdout/stderr capture, -AcceptableExitCodeList,
  -ParsingExpression regex parsing, -ExecutionTimeout / -ExecutionTimeoutInterval,
  -NoWait, -WindowStyle / -CreateNoWindow parameter sets, -Priority,
  -StandardInputObjectList, -SecureArgumentList, -LogOutput, -ContinueOnError, and
  ShouldProcess support. Secret plaintext is never written to user or machine scope.
- Stream capture uses event-based OutputDataReceived/ErrorDataReceived with
  BeginOutputReadLine/BeginErrorReadLine (no Task / ReadToEndAsync /
  GetAwaiter().GetResult()) to avoid PowerShell SynchronizationContext deadlocks.
- Restored the do { log; sleep } while (!HasExited) polling pattern using
  Thread.Sleep(pollInterval) so verbose "has been running for X" / "Checking again
  in Y" messages fire at the configured cadence even when no -ExecutionTimeout is
  supplied.
- TimeSpan values in verbose logs and on the result now use a friendly format
  ("7 seconds, and 364 milliseconds", "1 minute, and 30 seconds", "N/A" when zero)
  matching the legacy Start-ProcessWithOutput GetTimeSpanMessage scriptblock.
- Added DurationFriendly property to InfisicalProcessResult and a "The command
  execution took X" verbose line at completion.
- build.ps1 CmdletsToExport and Test-ModuleImports expected list contain 42 cmdlets.
- Added 9 xUnit tests covering FormatFriendly singular/plural, multi-unit joining,
  zero, sub-millisecond, and skip-zero-components behavior.

README.md

@@ -26,7 +26,7 @@ Import-Module -Name .\Module\PSInfisicalAPI
 
 ## Cmdlets
 
-The module exports 37 cmdlets. Discovery cmdlets (`Get-Infisical*`) use a `List` (default) / single-record parameter-set pair: invoking without the identity parameter returns the collection, supplying the identity parameter returns one record.
+The module exports 42 cmdlets. Discovery cmdlets (`Get-Infisical*`) use a `List` (default) / single-record parameter-set pair: invoking without the identity parameter returns the collection, supplying the identity parameter returns one record.
 
 ### Session
 
@@ -99,6 +99,12 @@ The module exports 37 cmdlets. Discovery cmdlets (`Get-Infisical*`) use a `List`
 | `Export-InfisicalScepMdmProfile`    | Writes a SCEP MDM profile to disk as a SyncML payload suitable for MDM delivery.                   |
 | `Write-InfisicalScepMdmProfileToWmi`| Submits a SCEP MDM profile to the local MDM Bridge WMI provider to trigger enrollment.             |
 
+### Process
+
+| Cmdlet                   | Purpose                                                                                            |
+| ------------------------ | -------------------------------------------------------------------------------------------------- |
+| `Start-InfisicalProcess` | Launches a child process with Infisical secrets injected directly into its environment block, capturing stdout/stderr and validating the exit code. |
+
 Use `Get-Help <Cmdlet> -Full` for parameter details and `Get-Help about_PSInfisicalAPI` for the module overview.
 
 ## Quick start