Consolidate four plugins into single glean plugin

[steve-calvert-glean]

Summary

• Merges glean-core, glean-search, glean-code, and glean-people into a single glean/ plugin directory
• Recommended by the Cursor team to improve marketplace discoverability and simplify installation
• Drops the duplicate enterprise-search skill from glean-search (glean-core version is a strict superset)
• Updates marketplace.json, package.json, and .release-it.json to reference the single plugin
• Removes all four old plugin directories

What's in the consolidated plugin

• 17 skills, 4 agents, 10 commands, 2 rules — all content from the original four plugins
• Single install: /add-plugin glean

Test plan

• node scripts/validate-plugins.mjs passes
• Install the glean plugin in Cursor and verify skills, agents, and commands are available
• Confirm Cursor re-indexes the plugin after merge

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