chore: add agent-skills config, glossary and example mod

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CONTEXT.md

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+# TpF3 Overtake
+
+A Transport Fever 3 script-mod that lets road vehicles pass slower vehicles instead of queueing behind them.
+
+## Language
+
+**Overtaking**:
+A faster vehicle getting past a slower one ahead of it on the same road, as seen by the player. It may be a visual illusion (the passer drives through the blocker) rather than a real lane change.
+_Avoid_: Passing, bypass
+
+**Blocker**:
+The slower vehicle ahead that the passer would otherwise queue behind.
+_Avoid_: Obstacle, lead vehicle
+
+**Passer**:
+The faster vehicle that overtakes the blocker.
+_Avoid_: Overtaker
+
+**Player-owned vehicle**:
+A vehicle belonging to one of the player's lines. Only these are in scope for overtaking.
+_Avoid_: AI vehicle, ambient traffic
+
+**Same-direction multilane road**:
+A road with two or more lanes in the passer's direction, where overtaking needs no oncoming-traffic check.
+
+**Two-way road**:
+A road with one lane per direction, where overtaking is only safe if no oncoming vehicle is in the way.