Strip nested page context markers from standalone RenderShortcodes

[bep]

Fixes #14732

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

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[Copilot]

Pull request overview

Fixes nested page context marker artifacts leaking into output when calling .RenderShortcodes in a standalone context (i.e., not followed by Goldmark rendering), addressing #14732.

Changes:

• Added a reusable hugocontext.Strip helper to remove __hugo_ctx markers from byte slices.
• Updated .RenderShortcodes to strip context markers when not running inside Goldmark.
• Added an integration test to ensure standalone .RenderShortcodes output contains no __hugo_ctx artifacts.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
markup/goldmark/hugocontext/hugocontext.go	Introduces Strip to remove Hugo context markers from rendered output.
hugolib/page__content.go	Applies hugocontext.Strip when .RenderShortcodes is executed outside Goldmark.
hugolib/rendershortcodes_test.go	Adds regression coverage for standalone .RenderShortcodes (Issue #14732).

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