task: Add Claude Code auto-format hook (#311)

* task: Claude formats JavaScript after edits

Based on https://code.claude.com/docs/en/hooks-guide#auto-format-code-after-edits

Opted to avoid the example's use of `npx` to avoid internet usage. The
formatting fails silently if the `prettier` package is not installed.

* docs: Remove redundant Claude formatting guidance

This is now completed by Claude hooks.

* docs: Remove redundant Claude lint directives

The lint fix script also verifies lint rules. There is no need to run
both scripts.

Author: dcalhoun

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+	"hooks": {
+		"PostToolUse": [
+			{
+				"matcher": "Edit|Write",
+				"hooks": [
+					{
+						"type": "command",
+						"command": "jq -r '.tool_input.file_path' | xargs ./node_modules/.bin/prettier --write"
+					}
+				]
+			}
+		]
+	}
+}

CLAUDE.md

@@ -201,14 +201,8 @@ Note: Console logs should be used sparingly. For verbose or development-specific
 **IMPORTANT**: Always run these commands after making code changes and before presenting work for review/commit:
 
 ```bash
-# Format JavaScript code
-make format
-
-# Auto-fix linting errors
+# Auto-fix linting errors & verify linting passes
 make lint-js-fix
-
-# Verify linting passes
-make lint-js
 ```
 
 These commands ensure code quality and prevent lint errors from blocking commits.