[mmikhasenko]

Summary

• Raise the HadronicLineshapes compat bound from 0.4.2 to 0.5, in Project.toml and benchmark/Project.toml.
• Make HadronicLineshapes a test-only dependency ([extras]/[targets]). Nothing in src/ loads it. Installing CascadeDecays no longer pulls it in; the docs, examples and benchmark environments already list it themselves.
• Remove the unused Literate dependency. It was never loaded anywhere in the repository.

HadronicLineshapes 0.5.0 makes BreitWigner, MultichannelBreitWigner and Flatte type-stable and allocation-free, which fixes mmikhasenko/HadronicLineshapes.jl#70. That was the last instability left after #50. With it, the benchmark model is fully inferred.

benchmark/heterogeneous_chains.jl, 8-chain pp → p p K⁺ K⁻ model, per phase-space point:

	HadronicLineshapes 0.4.2 (#50)	0.5.0 (this PR)
unpolarized_intensity(model, point)	34.3 μs, 47 KB	26.3 μs, 26 KB
@inferred unpolarized_intensity(model, point)	fails (lineshape returns Any)	passes

The benchmark comments that described BreitWigner as type-unstable are updated.

Merge order

• Type-stable evaluation of heterogeneous decay chains; release 0.5.0 #50 is merged; this PR is rebased onto main and contains a single commit.
• HadronicLineshapes v0.5.0 is registered (JuliaRegistries/General#171046, merged).
• No version bump needed. Type-stable evaluation of heterogeneous decay chains; release 0.5.0 #50 already bumps CascadeDecays to 0.5.0 and it isn't tagged yet, so this can ship in the same release.

Compatibility notes

• Nothing in src/ uses HadronicLineshapes, so it is now test-only; it's loaded by the tests, docs, examples and benchmarks. None of them use the APIs that 0.5.0 changes (MultichannelBreitWigner{N} as a concrete type, non-Int L in BlattWeisskopf{L}).
• docs/ and examples/ have no compat entry for HadronicLineshapes and will resolve to 0.5 automatically.

Test plan

• Full test suite against HadronicLineshapes at the registered commit 318b732 (v0.5.0), in a scratch environment: all 17 testsets pass.
• benchmark/heterogeneous_chains.jl against v0.5.0 (numbers above), plus @inferred on every chain and on the whole model.
• In a fresh environment, using CascadeDecays loads, and neither HadronicLineshapes nor Literate is installed.
• Runic 1.13.
• Pkg.test() against the registered HadronicLineshapes v0.5.0.
• CI.

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