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docs(notebooks): wire EOS lattice opt → harmonic via pyiron_workflow.Workflow (#60)

Replaces the bare `harmonic_free_energy(...).run()` call with a single
`Workflow` graph that first runs `optimise_cubic_lattice_parameter`
and pipes its `equil_struct` output into `harmonic_free_energy`:

    wf = Workflow("free_energy_solid_step1")
    wf.opt = optimise_cubic_lattice_parameter(structure=initial, ...)
    wf.harmonic = harmonic_free_energy(
        structure=wf.opt.outputs.equil_struct,  # data-dependency wire
        ...
    )
    result = wf.run()

The setup cell now seeds an intentionally off-by-~0.5% initial guess
(a=3.6 Å), so the EOS scan has something visible to do. EMT-Cu falls
on a0 ≈ 3.5898 Å with B0 ≈ 134 GPa (within ~5% of experiment 140 GPa).

Downstream sections (QHA, dynaphopy, calphy) rebind `structure` to
`wf.opt.outputs.equil_struct.value` so the entire notebook now operates
on the relaxed cell, not the off-by-0.5% guess.

Note: `equil_struct` does not appear in `result` because pyiron_workflow
filters out node outputs that are consumed downstream; access via the
node handle (`wf.opt.outputs.equil_struct.value`) instead.

Calphy section gracefully skips in this commit because the local lmp
build was deleted. Rebuild `/home/liger/lammps/build-calphy/lmp` (see
[[calphy-grace-lammps-recipe]] in memory) to restore the 4th curve.

Co-authored-by: Han Mai <ligerzerof@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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