Update Linguist languages.yml to latest upstream

[github-actions]

Summary

• Updates config/languages.yml to the latest version from github-linguist/linguist

This PR was automatically created by the Update Linguist workflow.

[greptile-apps]

Greptile Summary

This automated PR syncs config/languages.yml with the latest upstream GitHub Linguist language definitions. No application logic is affected — only the language detection configuration file is updated.

• Adds two new languages: Blueprint (markup, .blp extension) and Gno (programming, .gno extension, Go-based smart contract language)
• Updates the C# brand color from #178600 (green) to #7355dd (purple) and corrects Carbon's editor modes from Go-based to its own source.carbon scope
• Adds new filename patterns for Git Config (.tgitconfig, config.worktree), Ignore List (.ckignore, .rgignore), and JSON (.secrets.baseline)

Confidence Score: 5/5

Safe to merge — this is a data-only sync of the Linguist language definitions with no application logic changes.

The change is entirely confined to a YAML configuration file that drives language detection. It adds two new language entries, corrects Carbon's editor mode settings (previously pointing at Go tooling, now correctly scoped to source.carbon), updates C#'s color, and adds new filename associations. All changes are additive or cosmetic fixes sourced directly from the canonical upstream Linguist repo via an automated workflow.

Files Needing Attention: No files require special attention.

Important Files Changed

Filename	Overview
config/languages.yml	Upstream sync adding 2 new languages (Blueprint, Gno), correcting Carbon's editor config, updating C# color, and adding new filename associations — all additive, data-only changes with no logic impact

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Update Linguist Workflow] -->|triggers| B[Fetch latest languages.yml\nfrom github-linguist/linguist]
    B --> C[Commit changes to\nconfig/languages.yml]
    C --> D[Open PR #1435]
    D --> E{Changes in this PR}
    E --> F[Add Blueprint language\n.blp extension]
    E --> G[Add Gno language\n.gno extension]
    E --> H[Update C# color\n#178600 → #7355dd]
    E --> I[Fix Carbon editor config\nGo modes → own scope]
    E --> J[New filename patterns\nGit Config, Ignore List, JSON]
    F & G & H & I & J --> K[Language detection\nfor coding activity]

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Project	Deployment	Actions	Updated (UTC)
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