Fix dynamic property deprecation for display_options

[alistair3149]

Summary

Fixes #87.

On PHP 8.2 and later, rendering a page that uses #compound_query raises:

Deprecated: Creation of dynamic property SMW\DataItems\WikiPage::$display_options is deprecated in src/CompoundQueryProcessor.php

CompoundQueryProcessor::getQueryResultFromQueryString() attached a display_options array to every SMW result data item. Writing an undeclared property on SMW\DataItems\WikiPage is what triggers the notice.

Why removing it is correct

display_options is a leftover from old SMW, where result printers read display options off wiki-page values. In current Semantic MediaWiki nothing reads it:

• There is no reference to display_options anywhere in Semantic MediaWiki — no result printer, ResultArray, or data value consumes it.
• Its only reader in this extension was CompoundQueryResult::addResult(), which has no callers (and read the property off the QueryResult rather than the data item anyway).
• The merge path that actually runs — queryAndMergeResults() → mergeSMWQueryResults() → new CompoundQueryResult( … ) — never touches it.
• No test depends on it.

Because nothing consumes the property, removing it produces identical rendered output. It also removes a latent fatal: the old code called $queryResult->getResults() unconditionally, which would error on a format=debug subquery (where Store::getQueryResult() returns a string).

Changes

• src/CompoundQueryProcessor.php — remove the write loop and the $parameters block that existed only to feed it.
• src/CompoundQueryResult.php — remove the orphaned display_options reader in addResult().
• RELEASE-NOTES.md — note the fix under 7.0.0.

Testing

• php -l passes on both changed files.
• Confirmed no display_options references remain in the codebase.
• Full composer analyze / composer test not run locally; left to CI.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 28.57%. Comparing base (e67cd74) to head (9f7a955).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/CompoundQueryProcessor.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #92      +/-   ##
============================================
+ Coverage     26.35%   28.57%   +2.21%     
+ Complexity       48       44       -4     
============================================
  Files             3        3              
  Lines           129      119      -10     
============================================
  Hits             34       34              
+ Misses           95       85      -10     

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