Fix #21: documentation audit corrections

[tig]

Closes #21.

Addresses every finding from the documentation audit in #21.

🔴 Correctness

• Removed the phantom -AllProperties parameter (README.md, PLAN.md; the generated module/README.md regenerates from README.md). It doesn't exist in the cmdlet.
• Replaced the Microsoft-boilerplate .github/SECURITY.md (which routed vuln reports to MSRC / secure@microsoft.com) with a tui-cs policy using GitHub private vulnerability reporting + tig@kindel.com.
• Replaced the Microsoft-boilerplate .github/CODE_OF_CONDUCT.md with the Contributor Covenant v2.1 (enforcement contact tig@kindel.com).
• Fixed the dead RELATED LINKS in Show-ObjectTree.md (Out-File/Out-Printer/Out-String → Out-ConsoleGridView).
• Rewrote Out-ConsoleGridView.md Example 8 — F7/Shift+F7 is built in now, not an external gist to download.
• Fixed .github/workflows/README.md: ci-test runs Invoke-Build Build, Test (not … Package) on develop and main; packaging/publishing is release-only.

🟠 Staleness

• Updated the workflows README "Status" section (pipeline is live; Migrate CI/CD to clet's model, adapted for PowerShell Gallery (Install-Module) #5/Publish PSTui 1.0.0 to the PowerShell Gallery #6 closed; 1.0.x published).
• Dropped the inaccurate "sorting" claim for Show-ObjectTree (the tree view has no sort).
• Show-ObjectTree.md: fixed the dangling "see the Notes section" cross-reference, refreshed ms.date, corrected -MinUi → -MinUI.

🟡 Minor

• Fixed README.md Example 6 typos (paramter/proceses, unclosed paren).
• demo.ps1: de-duplicated the two "Example 4" labels, removed the undefined $line filter, fixed "fitlers".
• Added platyPS docs for the three exported history functions: Show-PSTuiHistory, Enable-PSTuiHistoryKeyHandler, Disable-PSTuiHistoryKeyHandler.

Verification

Invoke-Build -Configuration Release Build, Test green locally on pwsh 7.6 / .NET 10 — New-ExternalHelp accepts the new doc pages, 78 xUnit + 20 Pester pass.

🤖 Generated with Claude Code

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Put history function help in the module help file

These new history commands are PowerShell script functions exported from the PSTui module, but this front matter sends their platyPS content into PSTui.dll-Help.xml, which PowerShell's help naming rules reserve for C# cmdlets; exported function help is found via <ModuleName>-Help.xml unless the function has an .EXTERNALHELP directive. Because the same value is used on all three new history-function pages, Get-Help Show-PSTuiHistory -Full will fall back to the sparse comment-based help instead of showing these new examples/notes after New-ExternalHelp runs. See the PowerShell help-file naming rules: https://learn.microsoft.com/en-us/powershell/scripting/developer/help/naming-help-files?view=powershell-7.6

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