Deep heating dev

[Copilot]

Description

Changes from Andy to add per-level heating within the atmosphere column. Required step before handling #26.

Key changes in the style/refactoring commit (beab59c):

• Config restructured: Moved [deep_heating] under [physics.deep_heating] for consistency. Renamed keys (P_dep→Pmid, sigma_P→Pwid, efficiency→flux_rel, F_total→flux_abs). Replaced active bool with power_mode="off"|"rel"|"abs".
• Removed DeepHeatingParams struct: Replaced with flat fields on Atmos_t (deepheat_Pmid, deepheat_Pwid, etc.) matching AGNI's existing pattern.
• Simplified config parsing in AGNI.jl: Single block with key-presence validation replaces 36 lines of per-field haskey checks.
• set_deep_heating! signature: Positional args, input validation with @error/Bool return, bar→Pa conversion at call site.
• calc_fluxes!: Added deep::Bool kwarg to control deep heating instead of checking struct field.
• Version bump: 1.8.6 → 1.8.7
• Docs: Added Cheng An Hsieh to collaborators page.

⚠️ Known bug in src/energy.jl:979: deepheating referenced but the parameter is named deep — will cause UndefVarError at runtime.

Validation of changes

Tested on Fedora 43, Julia 1.11

Checklist

• I have followed the contributing guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have checked that the tests still pass on my computer
• I have updated the docs, as appropriate
• I have added tests for these changes, as appropriate
• I have checked that all dependencies have been updated, as required

Relevant people

@Didymos65803

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