Point the sample-dash rule at §8 and check section references

[dajiaohuang]

Fixes #273.

The fix

SKILL.md, Voice section. The sample-dash sentence named §6. Dashes are §8, because c2c6cad moved them there and updated the README number map but not this reference. One number changes.

The check

scripts/validate-package.py gains two assertions:

• Every §reference in SKILL.md must point at a pattern that exists. A renumber that removes patterns can otherwise strand a reference outside the list.
• The sample-dash rule must name the pattern whose heading covers dashes. The number comes from the heading, so a later renumber moves the rule and the check together.

README.md stays out of scope. Its §references sit in older version notes and use the old numbering on purpose.

Checks run

All three from AGENTS.md, against f0ee0c0:

$ python scripts/validate-package.py
Humanizer package v3.0.0 is valid

$ npx --yes skills@1.5.20 add . --list
Local path validated
Found 1 skill

$ claude plugin validate .
Validation passed

The new assertions fail on the unpatched file and pass on this one. Run against HEAD's SKILL.md:

$ python scripts/validate-package.py
Point the sample-dash rule at §8, the dash pattern
exit 1

And against a reference pushed out of range:

$ python scripts/validate-package.py
Point every SKILL.md section reference at a pattern from 1 to 25: [30]
exit 1

On the version

This changes a cross-reference and a check, so the version stays at 3.0.0. The last three commits that touched prose (9862685, a62daa3, c2c6cad) shipped the same way. Say the word and I will add a README note and bump instead.

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