feat: add column text-objects (il, al)

[kibi2]

Summary

Add column-based text-objects for tir-vim tables.

• il: inner column
• al: around column (including pipes)

The main use case is visual block selection:

• vil: select current column
• val: select column including delimiters

Design

This implementation is intentionally visual-mode oriented.

• Operator-pending (yil, dal, etc.) is not supported
• Instead, operations are expected to follow:
  • visual selection → operator (e.g. vily, vald)

This avoids unstable behavior of blockwise motions in Neovim
and keeps the implementation simple and predictable.

Implementation notes

• Column range is detected by scanning for pipe delimiters
• No block/AST structure is used (line-based lightweight approach)
• Assumes auto-repair mode keeps table alignment consistent

Limitations

• Behavior is undefined in manual mode (no alignment guarantee)
• Cross-table operations may break (same as Vim blockwise behavior)

[codecov]

Codecov Report

❌ Patch coverage is 88.51351% with 17 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lua/tirenvi/util/log.lua	0.00%	7 Missing ⚠️
lua/tirenvi/core/tir_vim.lua	94.36%	4 Missing ⚠️
lua/tirenvi/config.lua	85.71%	2 Missing ⚠️
lua/tirenvi/editor/textobj.lua	92.00%	2 Missing ⚠️
lua/tirenvi/init.lua	75.00%	2 Missing ⚠️

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