Add AP CSP Pseudocode Robot Runner & Tilemap System

[RudraBJoshi]

Summary

• Adds a visual 7×7 grid robot executor to the pseudocode code runner, implementing College Board AP CSP robot commands (MOVE_FORWARD, ROTATE_LEFT, ROTATE_RIGHT, CAN_MOVE)
• Adds a tilemap library (25 hand-designed navigable mazes) loaded via from tilemaps import N
• Adds spawn character at (col, row), spawn goal at (col, row), and RENDER(matrix) commands for full scene control
• Canvas-based step-by-step animation with Catppuccin-styled grid rendering
• Fixes pseudocode syntax highlighter (broken curly-quote string delimiters, comment colour override)
• Adds keyword reference guide and tilemap directory to the AP CSP Pseudocode Runner notebook with collapsible dropdowns

New files

• assets/js/pages/runners/executors/Pseudosystem_Executors/RobotExecutor.js — robot simulation, canvas renderer, frame-based animator
• assets/js/pages/runners/executors/Pseudosystem_Executors/PseudocodeExecutor.js — moved here, exports compile for reuse
• assets/js/pages/runners/tilemaps/index.js — 25 navigable 7×7 tilemaps

Test plan

• Select Pseudocode mode in any code runner — syntax highlighting works (keywords orange, builtins teal, comments gray)
• Run from tilemaps import 8 + spawn character at (1,1) + movement commands — grid renders and animates
• spawn goal at (col, row) renders a star that turns green when reached
• RENDER(myMap) with a custom 7×7 list-of-lists swaps the grid at runtime
• Hitting a wall shows robot turning red with an error message
• Output box expands to fit the full canvas without clipping
• Keyword reference dropdown and tilemap directory on the pseudocode runner page are collapsed by default