Add descriptions and docs for interfacial IC parameters

Required by lint_param_docs.py (merged in #1327): interface_file,
normFac, normMag, g0_ic, p0_ic used by hcid 304/305 hardcoded ICs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sbryngelson

docs/documentation/case.md

@@ -266,6 +266,16 @@ Setup: Only requires specifying `init_dir` and filename pattern via `zeros_defau
 Implementation: All variables and file handling are managed in `src/common/include/ExtrusionHardcodedIC.fpp` with no manual grid configuration needed.
 Usage: Ideal for initializing simulations from lower-dimensional solutions, enabling users to add perturbations or modifications to the base extruded fields for flow instability studies.
 
+The following parameters support hardcoded initial conditions that read interface data from files:
+
+| Parameter        | Type    | Description                                               |
+| ---:             | :---:   | :---                                                      |
+| `interface_file` | String  | Path to interface geometry data file                      |
+| `normFac`        | Real    | Interface normalization factor                            |
+| `normMag`        | Real    | Interface normal magnitude                                |
+| `g0_ic`          | Real    | Initial gas volume fraction for interfacial IC            |
+| `p0_ic`          | Real    | Initial pressure for interfacial IC                       |
+
 #### Parameter Descriptions
 
 - `num_patches` defines the total number of patches defined in the domain.

toolchain/mfc/params/descriptions.py

@@ -250,6 +250,12 @@
     "lag_mg_wrt": "Write bubble gas mass",
     "lag_betaT_wrt": "Write bubble heat transfer coefficient",
     "lag_betaC_wrt": "Write bubble mass transfer coefficient",
+    # Interfacial flow parameters
+    "interface_file": "Path to interface geometry data file",
+    "normFac": "Interface normalization factor",
+    "normMag": "Interface normal magnitude",
+    "g0_ic": "Initial gas volume fraction for interfacial IC",
+    "p0_ic": "Initial pressure for interfacial IC",
 }
 
 # Patterns for auto-generating descriptions of indexed parameters