Fix knock-knock joke structure (Issue #2)

[neomantra]

Summary

• Fix knock-knock structure to include missing punchline component () per Issue knock knock joke structure is incorrect #2
• Pattern: KK → "Who's there?" → A → "A who?" → A B. Input acts as ; appended punchline uses the same input for

Test plan

• Build: task build
• Run: ./injest -j knock hello world
• Expect output lines:
  • Knock knock
  • Who's there?
  • Your data.
  • Your data, who?
  • Your data hello world
  • Your data is not a joke: hello world

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