Add ANSI escape code colors to tetromino pieces

[Copilot]

• Update tetris/assets/textures/blocks to contain 7 colored block strings separated by commas, matching the Shape enum order (L=Orange, T=Pink, J=Purple/DarkBlue, S=Green, Z=Red, O=Yellow, I=Cyan)
• Load coloredBlocks from the blocks file at runtime via loadBlocks() instead of hardcoding in the header
• Declare coloredBlocks as extern const in tetromino.h, define in tetromino.cc
• Update tetromino.cc shapes map to use coloredBlocks[Shape] instead of plain "■"
• Update Tetromino::rotate() to use coloredBlocks[shapeType] for the current shape
• Update Board::lockPiece() to store the colored block string from the piece matrix into the grid
• Update Board::render() to display the colored block from the piece matrix for the active piece
• Update Board::gameOver() and Board::calculateBaseline() comparisons from == "■" to != " " so colored blocks are properly detected
• Verify all modified files compile successfully
• Run code review and security scan

Original prompt

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This section details on the original issue you should resolve

<issue_title>[optional] add colors to the pieces using "ANSI Escape Codes"</issue_title>
<issue_description>More info:

https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
https://en.wikipedia.org/wiki/ANSI_escape_code

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<agent_instructions>There is a texture called blocks, u will need to create 7 blocks separated in ansi characters codes and colons in between them

These are the available colours for pieces

Z -> Red
T -> Pink
I -> Cian
O -> Yellow
L -> Orange
S -> Green
J -> Purple/Dark Blue

\x1b[31m■\x1b[0m,...

If u need to separate the blocks using another character than a, you'll be free of it, but you need to separate the blocks and match their position with the enum Shape, so it will be easy to find what colour the current shape block is. You will need a global variable, maybe inlined as well, that tells what the current block is, and these "■" if now will change for that variable</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [optional] add colors to the pieces using "ANSI Escape Codes" #4

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[itssimmons]

@copilot You create the file, which is good, but you don't use it because you end up creating a coloredBlocks variable. What would be the goal of this file otherwise?

[Copilot]

Fixed in 7fbd619. coloredBlocks is now loaded from tetris/assets/textures/blocks at runtime via loadBlocks(), which reads the file and parses the comma-separated colored blocks. The header now just declares it as extern const—the file is the single source of truth.