chore: remove obsolete/corrupted check-no-vlang.sh gate

[hyperpolymath]

What

Removes the estate's scripts/check-no-vlang.sh gate and the CI step that
invoked it.

Why

V (vlang.io) was banned from the estate years ago. check-no-vlang.sh was
written to enforce that ban. At some point a global search-and-replace ran
"V" -> "zig" across the file and it now bans Zig instead -- Zig is the
estate's primary systems/FFI language (Zig-first ABI/FFI doctrine), so this
script has been silently failing CI for any repo that legitimately touches
Zig, and is worthless as a V-lang check now that "V" no longer appears in it.

Evidence of the corruption (from the script's own comments before removal):

• check-no-vlang.sh — enforce "ziguage is banned in the estate". (i.e. "V
  language" got replaced with "ziguage")
• Estate rule: zig (vlang.io) is banned. (vlang.io is V's site, not Zig's)
• PATTERNS=( ... 'zig' 'zig' 'vlang' ... ) (a duplicated replacement)
• failure message: zig has been replaced by zig-unified-api-adapter.

V is long retired from the estate and this check is obsolete either way, so
rather than fix the corrupted pattern list, this PR deletes the script and
its CI step outright.

What changed

• git rm scripts/check-no-vlang.sh
• Removed the "No zig references" / "No V-lang references" step from the
  CI workflow that invoked it (job/workflow otherwise untouched).

No other files were modified.

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gitar-bot]

CI failed: CI build failure caused by new root entries (`LICENSES/` and `flake.nix`) that are missing from the allowlist in `.machine_readable/root-allow.txt`.

Overview

The CI build failed across 2 jobs because the root-shape check script detected new unallowed entries in the repository root (LICENSES/ and flake.nix). This is directly related to the repository structure and the changes made.

Failures

Root Shape Check Failure (confidence: high)

• Type: build
• Affected jobs: 90106877901, 90107035636
• Related to change: yes
• Root cause: The script scripts/check-root-shape.sh . detected two root entries (LICENSES/ and flake.nix) that are not present in .machine_readable/root-allow.txt or the appropriate subdirectories.
• Suggested fix: Add LICENSES/ and flake.nix to .machine_readable/root-allow.txt or move them into the appropriate subdirectory.

Summary

• Change-related failures: 2 jobs failed due to unallowed repository root entries (LICENSES/ and flake.nix).
• Infrastructure/flaky failures: None.
• Recommended action: Update .machine_readable/root-allow.txt to include LICENSES/ and flake.nix, or relocate them to a permitted subdirectory.

Code Review ✅ Approved

Removes the obsolete and corrupted check-no-vlang.sh gate along with its corresponding CI step. No issues found.

Auto-approved: No blocking issues found.
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