docs: alphabetize annotations reference

[oojacoboo]

Summary

• Reorder all attribute sections in website/docs/annotations-reference.md alphabetically.
• The page's in-page navigation (sidebar ToC) currently lists attributes in a mixed semantic/historical order, which makes it hard to locate a specific attribute when you already know its name. Alphabetical order makes lookup trivial.
• Added a one-line note under the intro stating the order.
• No section body was modified — content is byte-identical aside from ordering and the single added note line.

Test plan

• grep -c "^## #\[" returns 25 before and after (no section lost or added).
• sort-diff of pre/post shows the only differing line is the new intro sentence.
• Render the Docusaurus site locally and verify the ToC displays A→Z.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (53f9d49) to head (56cb1d0).
⚠️ Report is 149 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #798      +/-   ##
============================================
- Coverage     95.72%   94.84%   -0.89%     
- Complexity     1773     1869      +96     
============================================
  Files           154      175      +21     
  Lines          4586     5079     +493     
============================================
+ Hits           4390     4817     +427     
- Misses          196      262      +66     

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