feat: env-doctor script (Agoric#10078)

_incidental_

## Description
Adds `yarn doctor` which calls `scripts/env-doctor.sh` to diagnose and repair common problems with the development environment.

I made this using [Aider](https://aider.chat):

```
Main model: claude-3-5-sonnet-20240620 with diff edit format, infinite output

# 2024-09-12 08:25:25.666744
+/add scripts/env-doctor.sh

# 2024-09-12 08:31:22.746300
+make env-doctor run a series of diagnostics on the development environment. each diagnostic has one remedy that is offered if its diagnostic test has an error exit code. each remedy is shown to the user and they are prompted to confirm whether to execute it. Each diagnostic and remedy has a description displayed to the user instead of the code. A user can reply "Yes" or"No", or "All" which answers Yes to the remaining questions. Each answer has an alias of its first letter (Y, N, A).

# 2024-09-12 08:35:00.044883
+add a check that `node --version` has the same version as in `.node-version`

# 2024-09-12 08:36:58.653105
+use fnm instead of nvm

# 2024-09-12 08:39:32.091136
+add a run_recommendation function that does not have a diagnostic and one of the recommendations is to run scripts/configure-vscode.sh to "Configure VS Code with recommended settings"

# 2024-09-12 08:45:13.008441
+add a last diagnostic "Build repo" that runs "yarn build". If that fails the remedy offered is to "git clean -fdx && yarn install && yarn build". If a remedy exits non-zero then alert the user to seek more help and exit the script.

# 2024-09-12 08:46:03.698422
+replace the NPM check with a check that `yarn --version` matches the version in the 'packageManager' field of the root package.json

# 2024-09-12 08:47:23.858173
+add a recommendation to run "yarn doctor" within a3p-integration
```

I wish Aider would include the chat message in the commit. Aider-AI/aider@16856bb looks like it was supposed to. 

### Security Considerations
n/a

### Scaling Considerations
n/a

### Documentation Considerations
Maybe docs.agoric.com gets some advice to use `yarn doctor`. It could save some of the setup steps.

### Testing Considerations

Needs some testing on different machines. Though it doesn't have to be perfect. I expect it will get iterated upon whenever someone runs into a problem.

I've tried it a few times locally. Once I had `"build": "exit 1"` to test the build remedy.

### Upgrade Considerations
n/a

package.json

@@ -53,6 +53,7 @@
     "docs:markdown-for-agoric-documentation-repo": "run-s docs:markdown-build 'docs:update-functions-path md'",
     "docs:markdown-build": "typedoc --plugin typedoc-plugin-markdown --tsconfig tsconfig.build.json",
     "docs:update-functions-path": "node ./scripts/update-typedoc-functions-path.cjs",
+    "doctor": "./scripts/env-doctor.sh",
     "lerna": "lerna",
     "link-cli": "yarn run create-agoric-cli",
     "create-agoric-cli": "node ./scripts/create-agoric-cli.cjs",

scripts/env-doctor.sh

@@ -0,0 +1,128 @@
+#!/bin/bash
+
+set -e
+
+# Check if running on macOS
+if [[ "$(uname)" != "Darwin" ]]; then
+  echo "Error: This script only works on macOS."
+  echo "Your current operating system is: $(uname)"
+  exit 1
+fi
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[0;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+# Function to run a diagnostic and its remedy
+run_diagnostic() {
+  local description="$1"
+  local diagnostic="$2"
+  local remedy_description="$3"
+  local remedy="$4"
+
+  echo -e "${YELLOW}Diagnostic:${NC} $description"
+  if eval "$diagnostic"; then
+    echo -e "${GREEN}✓ Passed${NC}"
+  else
+    echo -e "${RED}✗ Failed${NC}"
+    echo -e "${YELLOW}Remedy:${NC} $remedy_description"
+    if [[ $AUTO_YES != "true" ]]; then
+      read -p "Do you want to apply this remedy? (Yes/No/All) " answer
+      case ${answer:0:1} in
+        y | Y) ;;
+        a | A) AUTO_YES=true ;;
+        *) return ;;
+      esac
+    fi
+    if ! eval "$remedy"; then
+      echo -e "${RED}Remedy failed. Please seek more help.${NC}"
+      exit 1
+    fi
+    echo "Remedy applied."
+  fi
+  echo
+}
+
+# Diagnostics and remedies
+run_diagnostic \
+  "Check if fnm is installed" \
+  "command -v fnm >/dev/null 2>&1" \
+  "Install fnm" \
+  "brew install fnm"
+
+run_diagnostic \
+  "Check if Node.js is installed" \
+  "command -v node >/dev/null 2>&1" \
+  "Install Node.js using fnm" \
+  "fnm install --lts && fnm use lts-latest"
+
+run_diagnostic \
+  "Check if Node.js version matches .node-version" \
+  "[ \"$(node --version)\" = \"v$(cat .node-version)\" ]" \
+  "Install the correct Node.js version using fnm" \
+  "fnm install $(cat .node-version) && fnm use $(cat .node-version)"
+
+run_diagnostic \
+  "Check if Yarn version matches package.json" \
+  "[ \"$(yarn --version)\" = \"$(node -p "require('./package.json').packageManager.split('@')[1]")\" ]" \
+  "Install correct Yarn version" \
+  "corepack enable && yarn set version $(node -p "require('./package.json').packageManager.split('@')[1]")"
+
+run_diagnostic \
+  "Check if Git is installed" \
+  "command -v git >/dev/null 2>&1" \
+  "Install Git" \
+  "brew install git"
+
+run_diagnostic \
+  "Check if VSCode is installed" \
+  "command -v code >/dev/null 2>&1" \
+  "Install Visual Studio Code" \
+  "brew install --cask visual-studio-code"
+
+run_diagnostic \
+  "Check if Docker is installed" \
+  "command -v docker >/dev/null 2>&1" \
+  "Install Docker" \
+  "brew install --cask docker"
+
+run_diagnostic \
+  "Build repo" \
+  "yarn build" \
+  "Clean, reinstall dependencies, and rebuild" \
+  "git clean -fdx "**/node_modules" "**/bundles" && yarn install && yarn build"
+
+# Function to run a recommendation
+run_recommendation() {
+  local description="$1"
+  local recommendation="$2"
+
+  echo -e "${BLUE}Recommendation:${NC} $description"
+  if [[ $AUTO_YES != "true" ]]; then
+    read -p "Do you want to apply this recommendation? (Yes/No/All) " answer
+    case ${answer:0:1} in
+      y | Y) ;;
+      a | A) AUTO_YES=true ;;
+      *) return ;;
+    esac
+  fi
+  eval "$recommendation"
+  echo "Recommendation applied."
+  echo
+}
+
+echo -e "${GREEN}Environment check complete.${NC}"
+
+# Recommendations
+run_recommendation \
+  "Configure VS Code with recommended settings" \
+  "./scripts/configure-vscode.sh"
+
+run_recommendation \
+  "Run yarn doctor in a3p-integration" \
+  "cd a3p-integration && yarn doctor && cd .."
+
+echo -e "${GREEN}All checks and recommendations complete.${NC}"