[docs] Update documentation for features from 2026-04-07

[danielmeppiel]

Documentation Updates - 2026-04-07

This PR updates the documentation based on user-facing features and improvements merged in v0.8.11 (released 2026-04-06).

Features Documented

• apm marketplace add now respects GITHUB_HOST for GitHub Enterprise users (from fix: respect GITHUB_HOST in marketplace add command #589)
• apm compile warns when .instructions.md files are missing applyTo frontmatter (from fix: warn when instruction is missing required fields during apm compile #449)
• New warning when two installed packages deploy a native skill with the same name (from [fix] warn when two packages deploy a native skill with the same name #545)

Changes Made

• Updated docs/src/content/docs/guides/marketplaces.md -- added GitHub Enterprise callout under "Register a marketplace" noting GITHUB_HOST support
• Updated docs/src/content/docs/guides/compilation.md -- added tip about the applyTo missing-field warning in the "How It Works" section
• Updated docs/src/content/docs/guides/skills.md -- added "Duplicate Skill Name Warning" troubleshooting entry explaining the conflict warning and resolution steps

Merged PRs Referenced

• fix: respect GITHUB_HOST in marketplace add command #589 - apm marketplace add respects GITHUB_HOST environment variable for GitHub Enterprise users
• fix: warn when instruction is missing required fields during apm compile #449 - apm compile warns when instructions are missing applyTo across all compilation modes
• [fix] warn when two packages deploy a native skill with the same name #545 - Warn when two packages deploy a native skill with the same name

Notes

Other v0.8.11 fixes (subprocess encoding on Windows #591, PowerShell 5.1 compatibility #593, scope resolution #562, auto_create=False #576, symlink rejection #596) are internal bug fixes that do not require user-facing documentation updates.

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