feat: add ignite-ui-cli skill and command reference documentation

[Marina-L-Stoyanova]

Closes # .

Additional information related to this pull request:

[Copilot]

Pull request overview

Adds a new Ignite UI CLI “skill” plus a command-reference document intended to guide users on scaffolding, adding templates, serving, building, testing, config, auth template usage, and upgrades.

Changes:

• Added a new Ignite UI CLI skill (skills/ignite-ui-cli-skill.md) defining rules, workflow, cheat sheet, recovery steps, and examples.
• Added a new command reference document (skills/reference/commands.md) with full syntax, flags, templates, default ports, auth template details, and upgrade notes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 8 comments.

File	Description
skills/reference/commands.md	New command reference for ig CLI usage, flags, ports, templates, auth template, and upgrades.
skills/ignite-ui-cli-skill.md	New “skill” behavioral guide for using the Ignite UI CLI, referencing the command reference doc.

Comments suppressed due to low confidence (1)

skills/ignite-ui-cli-skill.md:62

• This row hardcodes a specific port (4201) as the suggested fix, which conflicts with the earlier “Never hardcode ports” rule and may not be appropriate for non-Angular projects. Consider using a placeholder (e.g., --port=<freePort>) or instructing the user to pick an unused port instead of suggesting a specific number.

| 403/404 on build | Missing Infragistics licensed account | Log in or switch to OSS packages |
| Port already in use | Conflict on default port | `ig start --port=4201` |
| Prompts don't render | Unsupported terminal (Inquirer.js) | Use Windows Terminal, iTerm2, or VS Code terminal |

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[Copilot]

@Marina-L-Stoyanova I've opened a new pull request, #1522, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

Comments suppressed due to low confidence (1)

skills/ignite-ui-cli-skill.md:62

• Non‑negotiable rule #4 says “Never hardcode ports”, but the error-recovery table suggests a specific port (ig start --port=4201). This is inconsistent guidance; consider rephrasing to “pick an available port” (or show a placeholder) to align with the rule.

| 403/404 on build | Missing Infragistics licensed account | Log in or switch to OSS packages |
| Port already in use | Conflict on default port | `ig start --port=4201` |
| Prompts don't render | Unsupported terminal (Inquirer.js) | Use Windows Terminal, iTerm2, or VS Code terminal |

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[dkalinovInfra]

Not bad to have some guidance how switching to OSS packages is done and how to setup the licence, if user have valid license

[dkalinovInfra]

I think that webComponents should be listed in frameworks and also in the end of the skills in part with examples as there is article in web components documentation about cli: https://www.infragistics.com/products/ignite-ui-web-components/web-components/components/general-cli-overview