Added missing knownHelpers for Ghost v6 helpers

[ErisDS]

Summary

• Added json, color_to_rgba, contrast_text_color to v6 knownHelpers — new helpers introduced in Ghost's private page feature (Ghost PR #26762)
• Added raw and search — pre-existing Ghost helpers that were missing from gscan's knownHelpers

Without these, themes using any of these helpers get false "unknown helper" warnings during validation.

Context

Ghost has a cross-reference test that verifies all theme-facing helpers in core/frontend/helpers/ are present in gscan's knownHelpers. That test currently fails for these 5 helpers, blocking merge until this gscan update lands.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: abfae839-6212-4a3e-9091-1c636905ac66

📥 Commits

Reviewing files that changed from the base of the PR and between 65b3062 and 88a0dc7.

📒 Files selected for processing (1)

• lib/specs/v6.js

---

Walkthrough

The pull request expands the knownHelpers array in lib/specs/v6.js by adding five new helper function names: json, color_to_rgba, contrast_text_color, raw, and search. The array previously contained only ['split'] and now includes these additional helpers, representing a single line modification to the specification file.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding five missing helpers to the knownHelpers set in Ghost v6 specifications.
Description check	✅ Passed	The description is directly related to the changeset, explaining the specific helpers added and the rationale for the change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-missing-known-helpers

📝 Coding Plan

• Generate coding plan for human review comments

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}