chore: release v0.21.0

[hugrbot]

🤖 New release

• hugr-model: 0.20.0 -> 0.21.0
• hugr-core: 0.20.0 -> 0.21.0 (⚠ API breaking changes)
• hugr-llvm: 0.20.0 -> 0.21.0 (✓ API compatible changes)
• hugr-passes: 0.20.0 -> 0.21.0
• hugr: 0.20.0 -> 0.21.0 (✓ API compatible changes)
• hugr-cli: 0.20.0 -> 0.21.0

⚠ hugr-core breaking changes

--- failure enum_missing: pub enum removed or renamed ---

Description:
A publicly-visible enum cannot be imported by its prior path. A `pub use` may have been removed, or the enum itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/enum_missing.ron

Failed in:
  enum hugr_core::import::OrderHintError, previously in file /tmp/.tmph5eDLa/hugr-core/src/import.rs:82
  enum hugr_core::import::ImportError, previously in file /tmp/.tmph5eDLa/hugr-core/src/import.rs:39

Changelog

hugr-model

0.20.0 - 2025-05-14

New Features

• [breaking] Mark all Error enums as non_exhaustive (#2056)
• [breaking] Bump MSRV to 1.85 (#2136)
• Export and import entrypoints via metadata in hugr-model. (#2172)
• Define text-model envelope formats (#2188)
• Import CFG regions without adding an entry block. (#2200)
• Symbol applications can leave out prefixes of wildcards. (#2201)

hugr-core

0.21.0 - 2025-05-29

Bug Fixes

• check well-definedness of DFG wires in validate (#2221)
• Check for order edges in SiblingSubgraph::from_node (#2223)
• Make SumType::Unit(N) equal to SumType::General([(); N]) (#2250)

New Features

• Add PersistentHugr (#2080)
• Add Type::used_extensions (#2224)
• Add boundary edge traversal in SimpleReplacement (#2231)
• Add signature map function for DFGs (#2239)
• PersistentHugr implements HugrView (#2202)
• PersistentHugr Walker API (#2168)
• [breaking] More helpful error messages in model import (#2264)

Refactor

• tidies/readability improvements to PersistentHugr (#2251)

Testing

• Ignore miri errors in tests involving assert_snapshot (#2261)

hugr-llvm

0.21.0 - 2025-05-29

Bug Fixes

• Make SumType::Unit(N) equal to SumType::General([(); N]) (#2250)

New Features

• [breaking] More helpful error messages in model import (#2264)

Testing

• Add exec tests for widen op (#2043)

hugr-passes

0.20.0 - 2025-05-14

New Features

• [breaking] Mark all Error enums as non_exhaustive (#2056)
• [breaking] Handle CallIndirect in Dataflow Analysis (#2059)
• [breaking] ComposablePass trait allowing sequencing and validation (#1895)
• [breaking] ReplaceTypes: allow lowering ops into a Call to a function already in the Hugr (#2094)
• [breaking] Hugrmut on generic nodes (#2111)
• [breaking] Remove RootTagged from the hugr view trait hierarchy (#2122)
• [breaking] Split Rewrite trait into VerifyPatch and ApplyPatch (#2070)
• [breaking] Bump MSRV to 1.85 (#2136)
• [breaking] Cleanup core trait definitions (#2126)
• [breaking] Removed runtime extension sets. (#2145)
• [breaking] Improved array lowering (#2109)
• export mangle name function (#2152)
• [breaking] Make NamedOp private. Add MakeExtensionOp::name and MakeOpDef::opdef_name (#2138)
• [breaking] Add Hugr entrypoints (#2147)
• [breaking] Return a node mapping in HugrInternals::region_portgraph (#2164)
• [breaking] Validate any HugrView, make errors generic (#2155)
• [breaking] Explicit hugr type param to ComposablePass (#2179)
• [breaking] Hide FuncDefn/cl fields, add accessors and ::new(...) (#2213)

Refactor

• [breaking] Removed global portgraph-related methods from HugrInternals (#2180)

hugr

0.21.0 - 2025-05-29

Bug Fixes

• check well-definedness of DFG wires in validate (#2221)
• Check for order edges in SiblingSubgraph::from_node (#2223)
• Make SumType::Unit(N) equal to SumType::General([(); N]) (#2250)

New Features

• Add PersistentHugr (#2080)
• Add Type::used_extensions (#2224)
• Add boundary edge traversal in SimpleReplacement (#2231)
• Add signature map function for DFGs (#2239)
• PersistentHugr implements HugrView (#2202)
• PersistentHugr Walker API (#2168)
• [breaking] More helpful error messages in model import (#2264)

Refactor

• tidies/readability improvements to PersistentHugr (#2251)

Testing

• Ignore miri errors in tests involving assert_snapshot (#2261)

hugr-cli

0.20.0 - 2025-05-14

New Features

• [breaking] Bump MSRV to 1.85 (#2136)
• [breaking] Add Hugr entrypoints (#2147)
• [breaking] Validate any HugrView, make errors generic (#2155)
• [breaking] Only expose envelope serialization of hugrs and packages (#2167)
• Packages do not include the hugr extensions by default (#2187)

---

This PR was generated with release-plz.

[codecov]

Codecov Report

Attention: Patch coverage is 39.90066% with 363 lines in your changes missing coverage. Please review.

Project coverage is 81.99%. Comparing base (157c44e) to head (817cb9e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
hugr-core/src/import.rs	39.90%	242 Missing and 121 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2220      +/-   ##
==========================================
- Coverage   82.16%   81.99%   -0.17%     
==========================================
  Files         239      239              
  Lines       42989    43158     +169     
  Branches    38901    39070     +169     
==========================================
+ Hits        35320    35386      +66     
- Misses       5678     5769      +91     
- Partials     1991     2003      +12     

Flag	Coverage Δ
python	85.34% <ø> (ø)
rust	81.64% <39.90%> (-0.19%)	⬇️

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