Add level descriptions

src/levels/l05.md

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+Fifth level mixes dictionaries and lists. Each chamber keeps its own inventory.
+
+chambers:
+  armory:
+    - sword
+    - shield
+  pantry:
+    - bread
+    - water
+  library:
+    - tome
+    - scroll
+
+Randomize the chamber names and their item lists

src/levels/l06.md

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+Sixth level introduces anchors. Two rooms share the same trap — define it once and alias it.
+
+trap: &spike_pit
+  type: pit
+  depth: 20
+  spikes: true
+rooms:
+  north: *spike_pit
+  south: *spike_pit
+
+Randomize the trap properties and which rooms reuse it

src/levels/l07.md

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+Seventh level is complex data structures. The map of a single floor, with every shape nested.
+
+floor: 3
+rooms:
+  entrance:
+    type: hall
+    exits:
+      - north
+      - east
+    contents:
+      - torch
+      - bench
+  treasury:
+    type: vault
+    locked: true
+    contents:
+      - gold
+      - ruby
+
+Randomize room names, types, exits and contents

src/levels/l08.md

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+Eighth level: tags and newlines. The scroll preserves its lines and demands explicit types.
+
+scroll: |
+  Beware the path
+  that turns twice.
+  Drink only at the third spring.
+weight: !!float 12
+title: !!str 2024
+
+Randomize the scroll text and the tagged values

src/levels/l09.md

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+Ninth level: special operators. The merge key lets each door inherit a template and override a field.
+
+door_defaults: &defaults
+  material: oak
+  locked: false
+north_door:
+  <<: *defaults
+  locked: true
+south_door:
+  <<: *defaults
+  material: iron
+
+Randomize the default values and which fields each door overrides

src/levels/l10.md

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+Tenth level: dynamic values. The vault ledger uses many number and date forms.
+
+vault:
+  gold: 0x1F4
+  silver: 0o755
+  experience: 1.5e3
+  date: 2024-06-15
+
+Randomize the integer bases, the exponent, and the date

src/levels/l11.md

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+Eleventh level: advanced anchors. Anchor shapes inside a list, then alias them elsewhere.
+
+shapes:
+  - &triangle
+    sides: 3
+    angles: 180
+  - &square
+    sides: 4
+    angles: 360
+copies:
+  - *triangle
+  - *square
+  - *triangle
+
+Randomize the shape definitions and which copies are reused