[Repo Assist] test: add 21 unit tests for PHPCBF class (no package.json changes)

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Summary

Adds 21 unit tests for the PHPCBF class using a lightweight vscode stub — no VS Code Extension Host required. Exports the PHPCBF class from extension.js to make it testable.

Previously, only findFiles had unit tests. The PHPCBF class (loadSettings, getArgs, getStandard) was completely untested.

Note: A similar change was previously blocked (issue #99) because it also modified package.json. This PR intentionally excludes any package.json changes. Run the new tests with node --test test/phpcbf.test.js (the existing npm run test:unit script still runs the original tests as before).

Changes

extension.js

Adds a single line:

exports.PHPCBF = PHPCBF;

This allows test/phpcbf.test.js to import the class without requiring VS Code.

test/phpcbf.test.js (new)

21 tests covering:

Suite	Count	What's tested
PHPCBF.loadSettings	11	Default values, configured values, tilde (~) expansion in executablePath, onsave, debug, standard, documentFormattingProvider
PHPCBF.getArgs	6	-lq vs -l (debug mode), tmpFileName placement, --standard=(value) presence/absence, argument ordering
PHPCBF.getStandard	4	configSearch: false pass-through, null workspace folder, undefined fileName

The test file uses Module._load to intercept require("vscode") and return a minimal stub. This technique is self-contained and does not require any new dependencies.

How to run

# New PHPCBF class tests:
node --test test/phpcbf.test.js

# Existing findFiles tests (unchanged):
npm run test:unit

# Both together:
node --test test/unit.test.js test/phpcbf.test.js

Test Status

✅ New tests: node --test test/phpcbf.test.js — 21/21 pass
✅ Existing tests: npm run test:unit — 7/7 pass
✅ Syntax check: node --check extension.js — no syntax errors

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