AlgoScan

When a block has mutually-dependent phi nodes (e.g. from a swap or
shift-register pattern in a loop) and is reduced to a single
predecessor, collapsing those phis to assignments would produce a
use-before-def: a register appears as both target and source in the
same parallel copy, but the predecessor that provided the bootstrap
values is gone.

No current optimization can trigger this — these checks are
defense-in-depth so that future changes to the optimizer surface a
clear error rather than silently producing incorrect IR.

Bumps [pytest-split](https://github.com/jerry-git/pytest-split) from 0.10.0 to 0.11.0.
- [Release notes](https://github.com/jerry-git/pytest-split/releases)
- [Changelog](https://github.com/jerry-git/pytest-split/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jerry-git/pytest-split/compare/0.10.0...0.11.0)

---
updated-dependencies:
- dependency-name: pytest-split
  dependency-version: 0.11.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [poethepoet](https://github.com/nat-n/poethepoet) from 0.30.0 to 0.42.1.
- [Release notes](https://github.com/nat-n/poethepoet/releases)
- [Commits](https://github.com/nat-n/poethepoet/compare/v0.30.0...v0.42.1)

---
updated-dependencies:
- dependency-name: poethepoet
  dependency-version: 0.42.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [junitparser](https://github.com/weiwei/junitparser) from 3.2.0 to 4.0.2.
- [Changelog](https://github.com/weiwei/junitparser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/weiwei/junitparser/compare/3.2.0...4.0.2)

---
updated-dependencies:
- dependency-name: junitparser
  dependency-version: 4.0.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [cattrs](https://github.com/python-attrs/cattrs) from 25.3.0 to 26.1.0.
- [Release notes](https://github.com/python-attrs/cattrs/releases)
- [Changelog](https://github.com/python-attrs/cattrs/blob/main/HISTORY.md)
- [Commits](https://github.com/python-attrs/cattrs/compare/v25.3.0...v26.1.0)

---
updated-dependencies:
- dependency-name: cattrs
  dependency-version: 26.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [packaging](https://github.com/pypa/packaging) from 24.2 to 26.0.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pypa/packaging/compare/24.2...26.0)

---
updated-dependencies:
- dependency-name: packaging
  dependency-version: '26.0'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>