feat(setup): auto-detect Windsurf and Cline

[luuuc]

Windsurf and Cline users now get Sense set up by sense setup, the same way Claude Code, Cursor, Codex CLI and OpenCode users do. The tool is detected, the guidance that steers the model toward Sense is written, and the one step Sense cannot do for you is spelled out.

Problem

sense setup only knew about four tools, so Windsurf and Cline users had to wire everything by hand. The FAQ also told them the generated .mcp.json would work, but neither tool reads it: both keep MCP servers only in a global settings file outside the project.

Summary

Adds Windsurf and Cline to the setup registry. Both read AGENTS.md, so setup writes the shared guidance there and prints the exact MCP server entry to add to the tool's global settings, since setup never writes outside the project.

Changes

• internal/setup/windsurf.go: detects windsurf on PATH or ~/.codeium/windsurf/, writes AGENTS.md, prints the MCP note, and undoes cleanly.
• internal/setup/cline.go: detects cline on PATH, ~/.cline/, or the VS Code extension, then does the same.
• registry.go / detect.go: one registry line and one constant per tool. --tools windsurf and --tools cline work with no other wiring.
• sense setup --help and CLI.md list all six tools. The help list is kept by hand, so a new test fails if a registry tool is missing from it.
• Docs: README, FAQ and the AI-tool contributing guide list the two tools and explain the manual MCP step. The FAQ's wrong .mcp.json claim is fixed, and the guide no longer claims the help text derives from the registry.

Architecture Highlights

• No files outside the project are touched, matching how Codex's global fallback is handled (a printed note, not a write).
• No .mcp.json is written for these tools, since neither reads it.
• Undo strips only Sense's section from AGENTS.md, keeping anything the user wrote.

Test Plan

• Detection: each signal (PATH, home dir, VS Code extension) and the not-found and no-home cases
• Setup writes AGENTS.md with the Sense section, prints the MCP note, and writes no .mcp.json
• Running setup twice over a user's own AGENTS.md keeps their content and one Sense section
• Undo restores the user's AGENTS.md exactly; a broken AGENTS.md fails the teardown with a clear error
• Manual: sense setup --tools windsurf,cline then sense setup --undo --tools windsurf,cline in an empty folder leaves it empty
• TestSetupHelpListsEveryTool fails without the help update and passes with it
• make ci passes (new files at 100% line and function coverage, 0 lint issues, complexity ledger 0)
• make smoke passes

Closes #168

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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