MyCel

Changed

• Chat messages use the MyCelium wiki palette: wiki red (#EF5350) brand, light-red keys and names, the wiki's text/muted greys. TextUtil constants keep their names, so dependent mods pick it up without code changes.
• Cleaner /mycel layout: single replies start with a bold Mycel › tag; lists tag only their header and indent the rows below (new TextUtil.item(), TextUtil.detail(), TextUtil.header(title, detail)). MycelDiagnostics.modLine()/configLine() now return untagged rows.
• CommandHelper.failure() uses vanilla's failure channel, so errors still show when sendCommandFeedback is off.
• /mycel output uses plain separators (·, ›, →) instead of em-dashes.
• Mycel checks for its own updates through the MyCelium wiki.

Fixed

• Mods registered before Mycel.initialize() were never update-checked.
• The update checker now refuses oversized responses while reading instead of after buffering the whole body, and reuses one HTTP client.
• Update-available log line no longer prints the URL twice.