feat: new type of non-violent 'combat': work

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diff --git a/worldbuilding_guide/courses.md b/worldbuilding_guide/courses.md
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-## Agility Courses
-
-Agility courses are defined in `data/courses/<id>.yaml`. Each course defines a sequence of obstacle rooms, each with a specific verb the player must type to advance. Obstacle rooms themselves are standard room YAML files (typically in `data/rooms/agility/`).
-
-### Course YAML
-
-```yaml
-id: "vent_shaft"
-name: "Ventilation Shaft Course"
-required_level: 1
-start_room: 200
-completion_xp: 40
-obstacles:
-  - room_id: 201
-    verb: scramble
-    ticks_per_phase: 2
-    xp: 8
-    fail_damage: [1, 2]
-    messages:
-      - "You approach the corroded ventilation wall..."
-      - "You find footholds in the rusted panels and begin to climb..."
-      - "You scramble up the wall and haul yourself onto the ledge!"
-  - room_id: 202
-    verb: balance
-    ticks_per_phase: 2
-    xp: 8
-    fail_damage: [1, 2]
-    messages:
-      - "You step onto the narrow coolant pipe..."
-      - "Arms outstretched, you carefully place one foot in front of the other..."
-      - "You reach the other side of the pipe and step onto solid ground!"
-```
-
-### CourseConfig Fields
-
-| Field            | Type          | Description                                          |
-| ---------------- | ------------- | ---------------------------------------------------- |
-| `id`             | string        | Unique course identifier                             |
-| `name`           | string        | Display name shown to players                        |
-| `required_level` | int           | Minimum Agility level to attempt the course          |
-| `start_room`     | int           | Hub room — teleported here on fail or lap completion |
-| `completion_xp`  | int           | Bonus XP awarded when a full lap is completed        |
-| `obstacles`      | []ObstacleDef | Ordered list of obstacles                            |
-
-### ObstacleDef Fields
-
-| Field             | Type     | Description                                                                 |
-| ----------------- | -------- | --------------------------------------------------------------------------- |
-| `room_id`         | int      | Room ID for this obstacle                                                   |
-| `verb`            | string   | Command the player types to attempt it (e.g. `scramble`, `jump`, `climb`)   |
-| `ticks_per_phase` | float64  | Ticks between each phase message (supports fractional via `engine.ToTicks`) |
-| `xp`              | int      | XP awarded for successfully completing this single obstacle                 |
-| `fail_damage`     | [2]int   | `[min, max]` damage on failure (HP clamped to minimum 1 — cannot kill)      |
-| `messages`        | []string | Exactly 3 strings for the 3-phase advancement system                        |
-
-### 3-Phase Message System
-
-Each obstacle advances through 3 phases, printing one message per phase:
-
-```
-Phase 0 (start):  messages[0] printed immediately
-Phase 1 (middle): messages[1] printed — FAILURE CHECK happens here
-Phase 2 (end):    messages[2] printed — XP awarded, teleport to next room
-```
-
-Failure only occurs at phase 1. Success chance is based on Agility level:
-- At required level: 70% success (30% fail)
-- Each level above reduces fail chance by 1% (down to minimum 5%)
-- Fail chance capped at 60%
-
-On failure, the player takes random damage in `[fail_damage[0], fail_damage[1]]`, is teleported back to `start_room`, and must restart the course.
-
-### Lap Counting
-
-Completing all obstacles in a course increments a lap counter stored as a player flag (`agility_laps_<course_id>`). The `completion_xp` bonus is awarded on the final obstacle only.
-
-### Obstacle Room YAML
-
-Each obstacle room should have an `on_enter` message telling the player which verb to use, and a `down` exit back to the course hub:
-
-```yaml
-id: 201
-name: "Ventilation Shaft - Corroded Wall"
-description: "A towering wall of corroded ventilation panels..."
-on_enter:
-  - message: "Type 'scramble' to climb the wall."
-exits:
-  down:
-    room: 200
-    blocked_message: ""
-```
-
-The hub room (e.g. room 200) links to the first obstacle of each course:
-
-```yaml
-id: 200
-name: "Agility Training Grounds"
-exits:
-  south: 17
-  north: 201      # Vent Shaft (level 1)
-  east: 210       # Rooftop (level 20)
-  west: 220       # Reactor (level 50)
-```
-
-### Supported Obstacle Verbs
-
-| Verb       | Gerund (display) |
-| ---------- | ---------------- |
-| `scramble` | scrambling       |
-| `jump`     | jumping          |
-| `swing`    | swinging         |
-| `balance`  | balancing        |
-| `climb`    | climbing         |
-| `crawl`    | crawling         |
-| `vault`    | vaulting         |
-| `leap`     | leaping          |
-| `slide`    | sliding          |
-
-Obstacle verbs are auto-registered at startup from all course YAML files. No changes to `cmd_registry.go` needed when adding new courses — any verb in a `data/courses/` file will work.