fix(init): avoid false positive neo-tree buffer detection

[oyoshot]

Summary

• Fix false positive neo-tree buffer detection that caused ClaudeCodeSend to fail in regular files whose buffer name includes neo-tree
• Add unit tests covering buffer-name matching

Problem

:'<,'>ClaudeCodeSend fails when executed in a regular file whose name contains neo-tree (e.g. neo-tree.nvim.lua).

Repro:

1. Open a regular file named neo-tree.nvim.lua
2. Visually select some lines
3. Run :'<,'>ClaudeCodeSend

Observed error:

ClaudeCode Error [ClaudeCode] [command] [ERROR] ClaudeCodeSend->TreeAdd: Not in a supported tree buffer (current filetype: lua)

Root Cause

The check string.match(current_bufname, "neo%-tree") matches any buffer name containing neo-tree, including regular files like /path/to/neo-tree.nvim.lua.

Solution

Restrict the buffer-name match to actual neo-tree buffers by anchoring the pattern to the beginning of the buffer name (e.g. neo-tree filesystem:/...).

Change:

string.match(current_bufname, "neo%-tree") → string.match(current_bufname, "^neo%-tree%s")

Tests

• Added unit tests for buffer-name matching
• All tests pass
• Verified the repro succeeds after the fix