[Diff since v2.29.8](v2.29.8...v2.29.9)

Patch release of ModelingToolkitStandardLibrary v2.29.9.

- Require Symbolics 7.39.2 (32-bit hash/hasha_seed) (#512)
- Fix Tube(N) segment length so total friction/inertia length is L (#525) (#526)
- Bump version to 2.29.9 (#531)

---
🤖 Posted by an AI agent — harness: Claude Code 2.1.301 · model: claude-opus-5-5
Conversation: https://claude.ai/code/session_01VZjwf7Ux9YtTzwHGHMqnsq

**Merged pull requests:**
- Add 32-bit Core CI lane via test_groups.toml (#511) (@ChrisRackauckas-Claude)
- Require Symbolics 7.39.2 (32-bit hash/hasha_seed) (#512) (@ChrisRackauckas-Claude)
- Skip exact radiator Q_flow equality on 32-bit (#513) (@ChrisRackauckas-Claude)
- Add AirspeedVelocity benchmarking CI (#514) (@ChrisRackauckas-Claude)
- Fix Tube(N) segment length so total friction/inertia length is L (#525) (#526) (@ChrisRackauckas-Claude)
- Bump version to 2.29.9 (#531) (@ChrisRackauckas)

**Closed issues:**
- Docs fail with Documenter 1.18 on plain API @ref links (#508)
- Tube(N) builds N TubeBase segments of length L/(N−1): total friction/inertia length is N·L/(N−1) (#525)

[Diff since v2.29.7](v2.29.7...v2.29.8)

- Drop stale [compat] majors older than one year (#505)
- build(deps): update DataInterpolations requirement from 6.4, 7, 8, 9.0 to 6.4, 7, 8, 9.0, 10.1 (#506)
- Support DataInterpolations v10.1 (#507)
- Fix Documenter binding references (#509)

---
🤖 Posted by an AI agent — harness: Claude Code, model: claude-opus-5[1m]. Chris asked for this release.

https://claude.ai/code/session_014FEzNTLFutCmTEAZ3zBg5R

**Merged pull requests:**
- Drop stale [compat] majors older than one year (#505) (@ChrisRackauckas-Claude)
- build(deps): update DataInterpolations requirement from 6.4, 7, 8, 9.0 to 6.4, 7, 8, 9.0, 10.1 in /docs in the all-julia-packages group across 1 directory (#506) (@dependabot[bot])
- Support DataInterpolations v10.1 in tests (#507) (@ChrisRackauckas-Claude)
- Fix Documenter binding references (#509) (@ChrisRackauckas-Claude)
- Release ModelingToolkitStandardLibrary 2.29.8 (#510) (@ChrisRackauckas)

[Diff since v2.29.4](v2.29.4...v2.29.7)

**Merged pull requests:**
- test: use Base.ifelse in Chua circuit (#477) (@ChrisRackauckas-Claude)
- Fix isothermal domain test connections (#478) (@ChrisRackauckas-Claude)
- Raise SymbolicUtils floor for minimum dependency tests (#479) (@ChrisRackauckas-Claude)
- Repair documentation example setup (#481) (@ChrisRackauckas-Claude)
- Raise ModelingToolkitBase floor for array codegen (#482) (@ChrisRackauckas-Claude)
- Define the independent variable in the motor test (#483) (@ChrisRackauckas-Claude)
- test: bound reconstructed magnetic flux balance by ULPs (#484) (@ChrisRackauckas-Claude)
- Define the piston test independent variable (#485) (@ChrisRackauckas-Claude)
- Fix rotational mechanics initialization and torque balance (#486) (@ChrisRackauckas-Claude)
- Initialize the FixedHeatFlow algebraic state (#487) (@ChrisRackauckas-Claude)
- Fix underdetermined thermal heat-flow sensor test (#488) (@ChrisRackauckas-Claude)
- Initialize translational acceleration sensor test (#489) (@ChrisRackauckas-Claude)
- test: exercise SISO initialization through ODEProblem (#491) (@ChrisRackauckas-Claude)
- Bump ModelingToolkitStandardLibrary to v2.29.5 for release (#493) (@ChrisRackauckas-Claude)
- Run downgrade CI on pushes to main (#494) (@ChrisRackauckas-Claude)
- Raise ModelingToolkit downgrade floors (#495) (@ChrisRackauckas-Claude)
- Sync package versions with the General registry (#496) (@ChrisRackauckas-Claude)
- qa: enforce strict SciMLTesting 2.4 checks (#497) (@ChrisRackauckas-Claude)
- Support DataInterpolations 9 (#499) (@ChrisRackauckas-Claude)
- Sync package versions with the General registry (#500) (@ChrisRackauckas-Claude)
- Raise OrdinaryDiffEq solver extras floors to 2 (#501) (@ChrisRackauckas-Claude)
- Drop older SciML major versions from compat (#502) (@ChrisRackauckas-Claude)
- Raise DataInterpolations floor to 9.2 (#503) (@ChrisRackauckas-Claude)
- Add PrecompileTools workload (#504) (@ChrisRackauckas-Claude)

**Closed issues:**
- Test resolver conflict: DataInterpolations 8 vs SciMLBase 3.35+ (#498)

[Diff since v2.29.4](v2.29.4...v2.29.6)

**Merged pull requests:**
- test: use Base.ifelse in Chua circuit (#477) (@ChrisRackauckas-Claude)
- Fix isothermal domain test connections (#478) (@ChrisRackauckas-Claude)
- Raise SymbolicUtils floor for minimum dependency tests (#479) (@ChrisRackauckas-Claude)
- Repair documentation example setup (#481) (@ChrisRackauckas-Claude)
- Raise ModelingToolkitBase floor for array codegen (#482) (@ChrisRackauckas-Claude)
- Define the independent variable in the motor test (#483) (@ChrisRackauckas-Claude)
- test: bound reconstructed magnetic flux balance by ULPs (#484) (@ChrisRackauckas-Claude)
- Define the piston test independent variable (#485) (@ChrisRackauckas-Claude)
- Fix rotational mechanics initialization and torque balance (#486) (@ChrisRackauckas-Claude)
- Initialize the FixedHeatFlow algebraic state (#487) (@ChrisRackauckas-Claude)
- Fix underdetermined thermal heat-flow sensor test (#488) (@ChrisRackauckas-Claude)
- Initialize translational acceleration sensor test (#489) (@ChrisRackauckas-Claude)
- test: exercise SISO initialization through ODEProblem (#491) (@ChrisRackauckas-Claude)
- Bump ModelingToolkitStandardLibrary to v2.29.5 for release (#493) (@ChrisRackauckas-Claude)
- Run downgrade CI on pushes to main (#494) (@ChrisRackauckas-Claude)
- Raise ModelingToolkit downgrade floors (#495) (@ChrisRackauckas-Claude)
- Sync package versions with the General registry (#496) (@ChrisRackauckas-Claude)
- qa: enforce strict SciMLTesting 2.4 checks (#497) (@ChrisRackauckas-Claude)

[Diff since v2.29.4](v2.29.4...v2.29.5)

**Merged pull requests:**
- test: use Base.ifelse in Chua circuit (#477) (@ChrisRackauckas-Claude)
- Fix isothermal domain test connections (#478) (@ChrisRackauckas-Claude)
- Raise SymbolicUtils floor for minimum dependency tests (#479) (@ChrisRackauckas-Claude)
- Repair documentation example setup (#481) (@ChrisRackauckas-Claude)
- Raise ModelingToolkitBase floor for array codegen (#482) (@ChrisRackauckas-Claude)
- Define the independent variable in the motor test (#483) (@ChrisRackauckas-Claude)
- test: bound reconstructed magnetic flux balance by ULPs (#484) (@ChrisRackauckas-Claude)
- Define the piston test independent variable (#485) (@ChrisRackauckas-Claude)
- Fix rotational mechanics initialization and torque balance (#486) (@ChrisRackauckas-Claude)
- Initialize the FixedHeatFlow algebraic state (#487) (@ChrisRackauckas-Claude)
- Fix underdetermined thermal heat-flow sensor test (#488) (@ChrisRackauckas-Claude)
- Bump ModelingToolkitStandardLibrary to v2.29.5 for release (#493) (@ChrisRackauckas-Claude)

[Diff since v2.29.1](v2.29.1...v2.29.4)

**Merged pull requests:**
- QA: run_qa v1.6 form + ExplicitImports (#468) (@ChrisRackauckas-Claude)
- Use InitializationProblem() in the SISO tests (rebase of #465) (#469) (@ChrisRackauckas-Claude)
- Release v2.29.2 (#470) (@ChrisRackauckas)
- Downgrade: raise OrdinaryDiffEqNonlinearSolve floor to 1.15 (#471) (@ChrisRackauckas-Claude)
- build(deps): update DataInterpolations requirement from 6.4, 7, 8 to 6.4, 7, 8, 9.0 in /docs in the all-julia-packages group across 1 directory (#472) (@dependabot[bot])
- Remove IfElse.jl dependency; use Base.ifelse (#473) (@ChrisRackauckas-Claude)
- Bump version to 2.29.3 (#474) (@ChrisRackauckas)
- Use SciMLTesting 2.1 QA docs check (#475) (@ChrisRackauckas-Claude)
- Release prep: bump to 2.29.4 (#476) (@ChrisRackauckas)

[Diff since v2.29.1](v2.29.1...v2.29.3)

**Merged pull requests:**
- QA: run_qa v1.6 form + ExplicitImports (#468) (@ChrisRackauckas-Claude)
- Use InitializationProblem() in the SISO tests (rebase of #465) (#469) (@ChrisRackauckas-Claude)
- Release v2.29.2 (#470) (@ChrisRackauckas)
- Downgrade: raise OrdinaryDiffEqNonlinearSolve floor to 1.15 (#471) (@ChrisRackauckas-Claude)
- build(deps): update DataInterpolations requirement from 6.4, 7, 8 to 6.4, 7, 8, 9.0 in /docs in the all-julia-packages group across 1 directory (#472) (@dependabot[bot])
- Remove IfElse.jl dependency; use Base.ifelse (#473) (@ChrisRackauckas-Claude)
- Bump version to 2.29.3 (#474) (@ChrisRackauckas)

[Diff since v2.29.1](v2.29.1...v2.29.2)

**Merged pull requests:**
- Use InitializationProblem() in the SISO tests (rebase of #465) (#469) (@ChrisRackauckas-Claude)
- Release v2.29.2 (#470) (@ChrisRackauckas)

[Diff since v2.29.0](v2.29.0...v2.29.1)

**Merged pull requests:**
- ci: add standard centralized workflows (auto-format, dependabot-automerge, docs-preview-cleanup) (#459) (@ChrisRackauckas-Claude)
- ci: re-enable downgrade job (strict) (#460) (@ChrisRackauckas-Claude)
- Canonical CI cleanup: TagBot thin-caller + downgrade-caller cleanup (#461) (@ChrisRackauckas-Claude)
- Canonical CI: grouped-tests.yml + root test/test_groups.toml (#462) (@ChrisRackauckas-Claude)
- QA: normalize versions to [lts, 1] (drop pre) (#463) (@ChrisRackauckas-Claude)
- Use SciMLTesting v1.2 (folder-based run_tests) (#464) (@ChrisRackauckas-Claude)
- Release v2.29.1 (#466) (@ChrisRackauckas)

[Diff since v2.28.0](v2.28.0...v2.29.0)

**Merged pull requests:**
- docs: namespace MTK analysis-point helpers and import ImplicitEuler (#449) (@ChrisRackauckas-Claude)
- CI: install Julia in FormatCheck workflow so runic-action can run (#451) (@ChrisRackauckas-Claude)
- CI: disable Downgrade workflow until ecosystem stabilizes (#453) (@ChrisRackauckas-Claude)
- Centralize CI on SciML reusable workflows (#455) (@ChrisRackauckas-Claude)
- build(deps): update ModelingToolkitStandardLibrary requirement to 2.28.0 in /docs in the all-julia-packages group across 1 directory (#456) (@dependabot[bot])
- fix: drop stale _clamp import (un-break Blocks/math tests) (#458) (@ChrisRackauckas-Claude)