set up claude hook for file formatting with Prettier

[shouples]

Same as https://code.claude.com/docs/en/hooks-guide#auto-format-code-after-edits but with some extra guarding in case a user doesn't have jq installed or the prettier command fails. This should reduce the number of times Claude needs to iterate to check diagnostics/linting between edits.

Docs: https://code.claude.com/docs/en/hooks

This also sets up .prettierignore so we don't need to keep track of exclusion patterns in multiple locations.

[shouples]

Note this doesn't use gulp format because we don't want to format the entire project every time a single file is edited/created

[Copilot]

Pull request overview

Sets up auto-formatting after Claude edits by wiring Prettier into Claude hooks and aligning formatting behavior with .prettierignore.

Changes:

• Simplifies format() globbing and makes the internal Prettier formatter respect .prettierignore
• Adds a repo-level .prettierignore for generated/build artifacts
• Adds a Claude PostToolUse hook to run Prettier on edited/written files

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
Gulpfile.js	Updates formatting pipeline + Prettier invocation to consult .prettierignore
.prettierignore	Centralizes ignore patterns for generated code and build output
.claude/settings.json	Adds a hook to run Prettier automatically after Edit/Write tool use

[Copilot]

Piping the file path through xargs without NUL delimiting/quoting can break on paths with spaces/newlines and can allow argument injection. Prefer capturing the value and invoking Prettier with proper shell quoting (and -- before the path) rather than xargs.

Suggested change

	"command": "command -v jq >/dev/null 2>&1 && jq -r '.tool_input.file_path' | xargs npx prettier --write --ignore-unknown 2>/dev/null || true"
	"command": "command -v jq >/dev/null 2>&1 && file_path=\"$(jq -r '.tool_input.file_path' | head -n1)\" && [ -n \"$file_path\" ] && npx prettier --write --ignore-unknown -- \"$file_path\" 2>/dev/null || true"