Slice: Explain range from RopeHead to leaf blob rewrite diff and tick

[flyingrobots]

Goal

Make :why prove where a byte range came from in causal rope authority.

Acceptance criteria

• :why names current head, worldline, byte range, leaf, blob, rewrite, diff, tick, and basis head when available.
• Imported untouched text cites import blob/leaf/head evidence.
• Edited text cites the last touching rewrite and tick.

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• Slice: Explain selected text from rope diff history #194

🔗 Related PRs

#195 - Add honest why observation coordinates [merged]
#205 - Document graph-backed rope runtime gate [merged]

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