refactor: make the offline Pester suite able to fail (#153) (#205)

Skip-IfMissing skipped a test whenever the cmdlet under test was absent
from the build, including the test asserting it exists. Every cmdlet
compiles into one assembly, so there is no partial-build case for it to
serve; all it did was hide a missing cmdlet. Delete the 37 copies and
every call site, and drop the residual conditional skips in the same
family (CmdExists probes, an attribute-presence skip in SdnCmdlets, a
lifecycle helper skipping on a cmdlet-name collision fixed long ago).

894 It blocks only reflected [Cmdlet] and [Parameter] attributes back at
the compiler: existence, CommandType -eq 'Cmdlet', Parameters.ContainsKey,
IsMandatory reflection, and per-file CmdletsToExport asserts for whichever
names an author remembered. Nothing reflected over the built assembly, so
a new cmdlet missing from the manifest shipped invisible. One data-driven
file replaces them: it diffs CmdletsToExport against the assembly's cmdlet
types in both directions and asserts the conventions reflection can see.

Behavioural tests are untouched: no-session errors, binding rejections,
ShouldProcess and -WhatIf, ConfirmImpact, ValidateSet and ValidateRange
values, parameter types, positions and pipeline binding.

The generated help covered 169 of 194 cmdlets. Regenerated with the repo's
own generate-help.ps1: 25 new markdown stubs, 13 existing docs picking up
parameters added in earlier waves, and a rebuilt MAML.

Co-authored-by: goodolclint-claude[bot] <323206664+goodolclint-claude[bot]@users.noreply.github.com>

docs/cmdlets/New-PveHaGroup.md

@@ -0,0 +1,181 @@
+---
+external help file: PSProxmoxVE.dll-Help.xml
+Module Name: PSProxmoxVE
+online version:
+schema: 2.0.0
+---
+
+# New-PveHaGroup
+
+## SYNOPSIS
+{{ Fill in the Synopsis }}
+
+## SYNTAX
+
+```
+New-PveHaGroup [-Group] <String> [-Nodes] <String> [-Restricted] [-NoFailback] [-Comment <String>]
+ [-Session <PveSession>] [-ProgressAction <ActionPreference>] [-WhatIf] [-Confirm] [<CommonParameters>]
+```
+
+## DESCRIPTION
+{{ Fill in the Description }}
+
+## EXAMPLES
+
+### Example 1
+```powershell
+PS C:\> {{ Add example code here }}
+```
+
+{{ Add example description here }}
+
+## PARAMETERS
+
+### -Comment
+Description or comment.
+
+```yaml
+Type: String
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -Confirm
+Prompts you for confirmation before running the cmdlet.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+Aliases: cf
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -Group
+HA group name.
+
+```yaml
+Type: String
+Parameter Sets: (All)
+Aliases:
+
+Required: True
+Position: 0
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -NoFailback
+Disable automatic failback to higher-priority nodes.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -Nodes
+Node list: 'node1:pri,node2:pri'.
+
+```yaml
+Type: String
+Parameter Sets: (All)
+Aliases:
+
+Required: True
+Position: 1
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -Restricted
+If set, resources can only run on this group's nodes.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -Session
+{{ Fill Session Description }}
+
+```yaml
+Type: PveSession
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -WhatIf
+Shows what would happen if the cmdlet runs.
+The cmdlet is not run.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+Aliases: wi
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -ProgressAction
+{{ Fill ProgressAction Description }}
+
+```yaml
+Type: ActionPreference
+Parameter Sets: (All)
+Aliases: proga
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### CommonParameters
+This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](http://go.microsoft.com/fwlink/?LinkID=113216).
+
+## INPUTS
+
+### None
+## OUTPUTS
+
+### System.Void
+## NOTES
+
+## RELATED LINKS