simplify repo for public release

[yourconscience]

Summary

• README cut from 274 to ~95 lines: one harness table, install steps, key commands, landscape table
• Landscape table: gstack, SuperClaude, skillshare vs dotagents (sync-focused rows)
• Landing page comparison table updated to match
• Removed Ghostex references from 4 skill files
• Code simplification: merged duplicate hook inspect/upsert functions, removed passthrough wrappers, inlined helpers (hooks.go -61 lines, agents.go -3, mcp.go -3, inspect.go reuse)
• Fixed runShellCheck breaking on home paths with spaces (from bot review)

Test plan

• go build ./cmd/dotagents/ passes
• CI green (5/5 checks)
• dotagents doctor passes on a clean setup
• Landing page renders correctly at GitHub Pages URL
• Plugin delivery still works after spawn/SKILL.md Ghostex removal

[gemini-code-assist]

Code Review

This pull request introduces a centralized external data sources registry to manage and check the availability of external data sources (such as X.com, Reddit, and GitHub) across skills. It adds a new dotagents sources CLI command, updates the tech-search skill to dynamically discover available search methods, refactors hook management to reduce duplication, and removes references to the experimental 'Ghostex' terminal manager. The review feedback correctly identifies a bug in runShellCheck where splitting the command string by spaces after tilde expansion will fail if the user's home directory path contains spaces, and provides a robust alternative parsing implementation.

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