Auto-update imports when files are renamed

[chrisdp]

Summary

• Adds LSP workspace/willRenameFiles support so renaming a .bs/.brs/.xml file in the editor auto-updates every import statement and <script uri> tag that points at it.
• Each project independently produces edits; ProjectManager reconciles by (srcPath, range) and drops any edit where projects disagree on the replacement text, so we never corrupt source files in a multi-project workspace.
• Original path style is preserved: pkg:/... stays pkg:/..., libpkg:/... stays libpkg:/..., and relative paths are recomputed from the containing file's pkg path.

Design notes

• Capability: LanguageServer.ts advertises workspace.fileOperations.willRename with a **/*.{bs,brs,xml} file filter. The handler is registered manually under connection.workspace because the existing on* auto-bind loop only sees top-level connection methods.
• Per-project edits: Project.getFileRenameEdits walks every BrsFile import statement and every XmlFile script-tag FileReference, comparing the resolved pkg path against the renamed file. Edits operate on the path-string range (which already excludes surrounding quotes), so quotes stay intact.
• New-path resolution: tries rokuDeploy.getDestPath first so custom files mappings keep working, and falls back to a plain rootDir-relative path so renames into folders that aren't yet covered by the files glob still get their imports rewritten. Bails when the new path is outside the project's rootDir.
• Worker delegation: WorkerThreadProject forwards via sendStandardRequest. The worker runner dispatches by name, so no other worker-side wiring is required.

Out of scope for v1

• Folder renames are unrolled per-file by the LSP client; the server only registers matches: 'file'.
• Files that move across project boundaries (different rootDir) are intentionally skipped — too easy to mangle in ambiguous cases.
• Edits whose source import "..." is not a recognized style (e.g. variable expression, no scheme + no relative form) are skipped.

Test plan

• 6 new util tests covering computeRenamedReferencePath path-style preservation
• 9 new Project tests covering pkg:/, libpkg:/, relative, cross-folder, no-match, out-of-project, range-excludes-quotes, XML relative, XML pkg:/, both-references-at-once
• 5 new ProjectManager consensus tests covering single-project pass-through, agreement, disagreement, unique-to-one-project, throw-isolation
• 3 new LanguageServer tests covering capability advertisement, null-when-no-match, and a full WorkspaceEdit on a real rename
• Existing 2700+ test suite passes
• Manual end-to-end verification (paired with the extension PR) — see linked PR

Paired extension PR

Companion change in the extension that handles the silent-apply + save flow on the client side: linking shortly.

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