Context Providers Audit

[RomneyDa]

Systematic audit of context providers to make sure types are prim and proper, all are functional with normal usage in both VS code and jetbrains

Changes

• Docs: added missing docs for problems, prompt files (not really missing but added a linking section), and greptile. Rearranged docs a bit to put more-used/basic up top
• Added various missing config schema enum and param type values
• Added several more representative icons for the MentionList dropdown
• Fix some small bugs

Findings/Things to fix in future PRs

• @OPEN Files context provider appears broken: "Cannot read properties of undefined (reading 'content')"
• @clipboard context provider doesn't yet support Jetbrains IDE copying and in VS code there seems to be a minor LRU cache bug when things are copied externally
• @debugger returning nothing when there are variables in the debugger - VS Code
• @google is questionably useful: it returns top results but only links and titles, no content. Intentional?
• @Terminal throws error when terminal is empty: "Cannot read properties of undefined (reading 'content')"
• @github Issue returns both PRs and Issues. Intentional?
• @docs: several pre-indexed docs are broken - seems that they are not in S3
• @codebase, @folder, and @docs retrieval quality issues are apparent
• @discord schema isn't right, channels param isn't actually used
• Highlights, Outline, and Continue Proxy context providers - these are the outliers that have some code but don't seem to be in use. Let's fix or remove
• Most context providers still don't have tests

More complex context providers to test thoroughly in near future:

database, discord, gitlab-mr, greptile, http, jira, mcp, postgres
All on Jetbrains

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