chore(main): release 0.19.0

[hugrbot]

:robot: I have created a release beep boop

0.19.0 (2025-05-22)

⚠ BREAKING CHANGES

• deprecated hresult and qsys_result modules have been removed. Use hugr.qysystem.result directly.
• Generated HUGRs now refer to entrypoints and are always modules in envelopes.

Features

• Add stack data structure to standard library (#973) (f82ee42)
• Bump to Hugr 0.20 and switch to value arrays for lowering (#930) (321b68c)
• Implement sampling from a generic discrete distribution (#966) (2cb3c6d)
• Stop emitting non-local edges (#962) (e5e55b1), closes #963

Bug Fixes

• Specify bash shell in justfile. (#971) (1ec956e)
• Stop monomorphising higher-order custom function values (#972) (952dba0)
• stop using value ExtensionSet (#967) (4d47b5f)

Documentation

• fix docstring backtick (#976) (498f3fb)

Code Refactoring

• delete deprecated result modules (#975) (ab800cc)

---

This PR was generated with Release Please. See documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.78%. Comparing base (a71d949) to head (9290f84).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #965   +/-   ##
=======================================
  Coverage   92.78%   92.78%           
=======================================
  Files          85       85           
  Lines        9887     9887           
=======================================
  Hits         9174     9174           
  Misses        713      713           

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[hugrbot]

🤖 Created releases:

• v0.19.0

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