Fix Composed Ops Docs

[mvandeberg]

Closes #211

Docs: fix wrong namespaces, signatures, and behavior in composed-ops guide

Fixes #211:

• corosio::read/write → capy::read/write (correct namespace)
• Include paths: boost/corosio/ → boost/capy/
• read-into-string uses string_dynamic_buffer, not bare std::string
• Return type is io_taskstd::size_t, not task<io_resultstd::size_t>
• capy::error::eof → capy::cond::eof (error condition, not error code)
• Remove incorrect write() zero-byte → broken_pipe claim
• boost::system::system_error → capy::detail::throw_system_error
• Template constraints use terse syntax matching actual signatures

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[cppalliance-bot]

An automated preview of the documentation is available at https://234.corosio.prtest3.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-04-17 15:47:39 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.71%. Comparing base (3fc8c97) to head (ee884cd).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #234   +/-   ##
========================================
  Coverage    77.71%   77.71%           
========================================
  Files           96       96           
  Lines         7298     7298           
  Branches      1787     1787           
========================================
  Hits          5672     5672           
  Misses        1108     1108           
  Partials       518      518           

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[cppalliance-bot]

GCOVR code coverage report https://234.corosio.prtest3.cppalliance.org/gcovr/index.html
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Build time: 2026-04-17 16:01:47 UTC