[codex] Discover current SIMPLE libneo build outputs

[krystophny]

Summary

• stop hard-coding one specific SIMPLE/libneo build-tree layout for libhdf5_tools.a
• auto-discover the current SIMPLE libneo build root and reuse it for include and library paths
• update trace_orbit_simple.f90 to the current SIMPLE tracer_t API and add the transitive static archives the manual link line now requires

Why

benchmark_orbit was coupled to an older internal SIMPLE/libneo build layout and no longer built against the current tree.

This keeps the manual make fortran flow, but makes it work with the canonical current SIMPLE/libneo outputs.

Linked work

• libneo issue: Dependency audit: downstream map, duplication report, and split proposals libneo#258
• sparse_draft sibling PR: https://github.com/itpplasma/sparse_draft/pull/15
• KAMEL sibling PR: [codex] Wrap libneo hdf5_tools in KAMEL KAMEL#124

Verification

make fortran SIMPLE_DIR=/home/ert/code/SIMPLE

Result: build/trace_orbit_simple builds successfully against the current SIMPLE checkout.