Remove obsolete attributes from the formatter's filters and merge them

[cknitt]

Stacked on #8738.

The formatter keeps lists of internal attributes it doesn't print. Two of the entries were obsolete, and two of the lists disagreed:

• res.ternary and JSX are only v0 wire markers now. The parser produces Pexp_ternary and Pexp_jsx_element, and the v0 bridge turns both markers back into those nodes. They're removed from is_parsing_attr, has_attributes and is_printable_attribute, like res.await in Represent await on module expressions with a Pmod_await node #8738.
• is_printable_attribute and is_parsing_attr disagreed. That mismatch caused the @JSX review finding in Fix module expressions losing attributes, await or parens when formatting #8735: an attribute that was printed but not counted for parens. After removing the obsolete entries they differed only in res.patVariantSpread and res.dictPattern, which the parser only puts on patterns. The printable helpers are only used on expressions and module expressions, so they're now defined in terms of is_parsing_attr, leaving one list. filter_printable_attributes was the same as filter_parsing_attrs and is removed.

has_attributes stays separate because of its res.iflet / @warning("-4") rule; it only loses res.ternary.

Behavior

• Formatting the repo's .res/.resi files and the module-expression round-trip cases from Fix module expressions losing attributes, await or parens when formatting #8735 gives byte-identical output to Represent await on module expressions with a Pmod_await node #8738.
• A @JSX attribute written in source now gets the same parens as any other attribute: (@JSX x) + 1 and (@JSX x)->g were printed as @JSX x + 1 and @JSX x->g. Both parse the same way, so only the style changes.
• A @res.ternary attribute written in source is no longer dropped: let b = @res.ternary x was formatted as let b = x. It's printed with the same parens as other attributes.

Tests

• printer/expr/markerAttributes.res: @JSX and @res.ternary written in source, with @foo for comparison, on operands of binary operators, pipes, unary operators, field and array access, calls, ternaries, arrays and records.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.97%. Comparing base (23a4197) to head (1f3b6d6).

Files with missing lines	Patch %	Lines
compiler/syntax/src/res_parsetree_viewer.ml	66.66%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8740   +/-   ##
=======================================
  Coverage   79.97%   79.97%           
=======================================
  Files         464      464           
  Lines       63236    63232    -4     
=======================================
- Hits        50573    50571    -2     
+ Misses      12663    12661    -2     

Files with missing lines	Coverage Δ
compiler/syntax/src/res_printer.ml	93.51% <100.00%> (ø)
compiler/syntax/src/res_parsetree_viewer.ml	93.00% <66.66%> (+0.51%)	⬆️

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commit: 1f3b6d6

[cknitt]

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📝 Code Review	✅ Completed 2026-10-08T16:35:22.918919Z	c3f4386	Manual request

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Reviewed commit: 42197a5a4d

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Reviewed commit: c3f4386b75

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