Add Lesson 18: LSP Servers — code intelligence setup for Copilot CLI

[Copilot]

• Create new lesson tutorial/lessons/18-lsp-servers.md covering LSP server value and setup
• Rename core lessons: 18→19 (images), 19→20 (billing), 20→21 (graduation)
• Rename QA lessons: 21→22, 22→23, 23→24, 24→25, 25→26
• Rename Design lessons: 26→27, 27→28, 28→29, 29→30, 30→31, 31→32
• Update lesson titles (H1 headings) in all renamed files
• Update tutorial/lessons/00-welcome.md to add lesson 18 and shift 18-21 in listing; fix stale image lesson reference (was Lesson 17, now Lesson 19)
• Update .github/agents/next.agent.md — cap core at 21, QA at 26, design at 32
• Update .github/agents/skip.agent.md — cap core at 21, QA at 26, design at 32
• Update .github/agents/core.agent.md — update lesson 20 references to 21
• Update .github/agents/progress.agent.md — add lesson 18, shift 18-20 to 19-21, update lesson counts to 21
• Update .github/agents/qa.agent.md — start QA at 22
• Update .github/agents/design.agent.md — start Design at 27
• Update .github/copilot-instructions.md — update track ranges and lesson list; remove duplicate Design Lessons section
• Update README.md — update QA (22-26) and Design (27-32) track ranges
• Fix cross-references in 24-automated-test-generation.md (Lesson 22→23), 31-rapid-prototyping.md (Lesson 29→30), 32-design-track-graduation.md (Lesson 29→30)
• Clarify that without LSP, Copilot falls back to slower grep-style text search with false-match risk
• Add troubleshooting hint advising learners to ask Copilot to diagnose LSP server startup failures (e.g. pnpm symlink needed to place typescript in the expected node_modules location)

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[calebwilson706]

@copilot is it also faster instead of needing to use grep / other search mechanisms

[Copilot]

Yes — updated in 50a9ad4. The "Why does this matter" section now explains that without LSP, Copilot falls back to grep-style text search, which is both slower and prone to false matches (e.g. a variable name appearing in comments, strings, and unrelated files).

[calebwilson706]

@copilot add guidance saying to get copilot to troubleshoot, for example with pnpm i had to add a symlink to make sure typescript was in the excpected location in the node_modules

[Copilot]

@copilot add guidance saying to get copilot to troubleshoot, for example with pnpm i had to add a symlink to make sure typescript was in the excpected location in the node_modules

Done in e7cf28e. Added a fifth hint telling learners to paste the /lsp error into chat and ask Copilot to diagnose it, using the pnpm symlink case as a concrete example of the kind of environment-specific fix it can suggest.

[calebwilson706]

@copilot don't make it an exercise, just make a point that they should do this

[Copilot]

@copilot don't make it an exercise, just make a point that they should do this

Done in d1c75a2. Moved it out of Hints and into the main lesson body as a plain paragraph right after the install table — just a direct statement that if the server fails to start, paste the /lsp error into the chat and let Copilot diagnose it.