[Repo Assist] improve: extract resolveWorkspacePath utility; fix relative standard paths

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Summary

Extracts a new resolveWorkspacePath() utility in lib/utils.js and uses it to resolve the phpcbf.standard setting, fixing the case where relative paths (e.g. ./ruleset.xml) were silently passed through to phpcbf unchanged.

Closes #38 (partially — ./ruleset.xml in phpcbf.standard now resolves to an absolute path against the workspace root).

Root Cause

loadSettings() already handled \$\{workspaceFolder} / \$\{workspaceRoot} substitution for the standard setting, but it did not resolve relative paths like ./ruleset.xml or vendor/standard/ruleset.xml. These were passed directly to phpcbf, which then failed because phpcbf receives a temp-file path as the document and has no notion of the VS Code workspace root.

Changes

File	Change
lib/utils.js	Add resolveWorkspacePath(inputPath, rootPath) — handles ~ expansion, \$\{workspaceFolder}/\$\{workspaceRoot} substitution, and relative-path resolution
extension.js	Replace inline variable substitution in loadSettings() with a call to resolveWorkspacePath()
test/unit.test.js	Add 10 unit tests for resolveWorkspacePath (17 total; all pass)

resolveWorkspacePath behaviour

Input	rootPath	Output
./ruleset.xml	/workspace	/workspace/ruleset.xml
vendor/bin/standard	/workspace	/workspace/vendor/bin/standard
\$\{workspaceFolder}/phpcs.xml	/workspace	/workspace/phpcs.xml
\$\{workspaceRoot}/phpcs.xml	/workspace	/workspace/phpcs.xml
~/.phpcs.xml	any	(homedir)/.phpcs.xml
/absolute/path.xml	any	/absolute/path.xml (unchanged)
./relative.xml	null	./relative.xml (unchanged, no root)

Trade-offs

• Relative-to-workspace semantics — relative paths are resolved against the workspace root folder for the document being formatted, consistent with how executablePath is handled and with user expectation.
• No breaking change — absolute paths and already-substituted paths pass through unchanged.
• The utility is reusable; future callers (e.g. executablePath, custom standards from a config file) can use the same function.

Test Status

node --test test/unit.test.js

▶ findFiles (7 tests) ✔
▶ resolveWorkspacePath (10 tests) ✔

tests 17 | pass 17 | fail 0

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