vetkd: example code attaches fewer cycles than the skill's own stated key_1 fee

[raymondk]

• skills/vetkd/SKILL.md:45 — fee table: key_1 costs 26_153_846_153 cycles.
• skills/vetkd/SKILL.md:47 — "send more cycles than the current cost so that future subnet size increases do not cause calls to fail; unused cycles are refunded."
• skills/vetkd/SKILL.md:290 — Rust code attaches 26_000_000_000 cycles; skills/vetkd/SKILL.md:373 — Motoko (with cycles = 26_000_000_000).

The copy-paste code attaches ~154M cycles LESS than the stated fee, directly violating the "send more" rule two sections earlier.