Fix polyglot terminator

[glen-level12]

the standalone """ line will leave an unmatched quote for the shell parser and can prevent the script from running at all

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.05%. Comparing base (b1c1caa) to head (d3909e5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files          13       13           
  Lines        2268     2268           
  Branches      152      152           
=======================================
  Hits         2224     2224           
  Misses         40       40           
  Partials        4        4           

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[augmentcode]

🤖 Augment PR Summary

Summary: Fixes the shell/Python polyglot terminator in tasks/mise-uv-init.py so /bin/sh doesn’t see an unmatched quote and abort parsing.

Changes: Updates the closing sentinel from """ to ":""" to keep the bootstrap preamble valid in both interpreters.

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[augmentcode]

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