docs: document template name format

[mishushakov]

Adds a Name format section to the template names doc, documenting what the server actually enforces: names are trimmed and lowercased, then must match ^[a-z0-9-_]+$ (lowercase letters, numbers, dashes, underscores; at least one character; leading/trailing dashes and underscores allowed; no length cap). Also notes that uppercase input is auto-lowercased and other characters (spaces, dots, slashes) are rejected.

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[cursor]

PR Summary

Low Risk
Documentation-only change with no runtime or API impact.

Overview
Adds a Name format section to docs/template/names.mdx before team-local naming. It documents trim and lowercase normalization, the ^[a-z0-9-_]+$ rule, allowed characters, no max length, auto-lowercasing of uppercase input, and rejection of invalid characters.

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