feat(lsp): add Rename Symbol support

[amondnet]

Summary

Add textDocument/rename and textDocument/prepareRename LSP support to @pleaseai/code-lsp package.

Motivation

From docs/TODO.md - Rename Symbol is the #1 high priority missing feature compared to Serena's SolidLSP implementation. This enables AI coding tools to perform safe refactoring operations across the codebase.

LSP Methods

• textDocument/prepareRename - Validates if symbol at position can be renamed
• textDocument/rename - Performs rename operation, returns WorkspaceEdit

Tasks

• T001 [P] Add type schemas (TextEdit, WorkspaceEdit, PrepareRenameResult)
• T002 [P] Add rename capability to client initialization
• T003 Add normalization methods (normalizeWorkspaceEdit, normalizePrepareRename)
• T004 Add prepareRename() method (depends on T001, T003)
• T005 Add rename() method (depends on T001, T003)
• T006 Update CLAUDE.md documentation (depends on T004, T005)
• T007 [P] Add unit tests for normalization
• T008 Add integration tests for TypeScript LSP (depends on T004, T005)

Dependencies & Execution Order

Parallel Group 1 (independent):

• T001: Type schemas
• T002: Client capability
• T007: Unit tests (TDD)

Sequential:

1. T003: Normalization methods
2. T004: prepareRename method
3. T005: rename method
4. T006: Documentation
5. T008: Integration tests

References

• Spec: specs/001-rename-symbol/spec.md
• Architecture: specs/001-rename-symbol/architecture.md
• Serena Reference: ref/serena/src/solidlsp/ls.py:1834-1859
• TODO.md: docs/TODO.md#1-rename-symbol