fix(frameworks): stop prose and image mime types from faking magento

[TBX3D]

the bare "Magento" body word matched any page that merely named the
platform, and "mage/" is a substring of the near-ubiquitous "image/"
mime type, so a migration guide carrying a single image reference
scored both signatures and cleared the detection threshold. key on the
frontend static-asset base, the data-mage-init widget attribute and the
module namespace, which only appear when magento actually rendered the
page.

[github-actions]

pr summary

2 files changed (+7 -2)

category	files
go source	2
tests	1

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #322   +/-   ##
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  Coverage        ?   64.80%           
=======================================
  Files           ?       86           
  Lines           ?     7630           
  Branches        ?        0           
=======================================
  Hits            ?     4945           
  Misses          ?     2301           
  Partials        ?      384           

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[vmfunc]

diagnosis is right, "image/" contains "mage/" as a substring and bare "Magento" caught any page that named it. new anchors are all structural. checked against detector.go: totalWeight 1.4, sigmoid centers at 0.3, so a single 0.4 marker lands at 0.286 and won't trip, you need two real signals to clear the threshold. good fp resistance and recall holds since real magento carries data-mage-init + /static/frontend/ + Magento_ together. in.

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