fix(result-contract-completion): enforce complete result provenance

docs/HDF5_SCHEMA.md

@@ -18,7 +18,11 @@ infer compatibility from a version prefix.
 
 - Root attributes are variable-length UTF-8 strings:
   `schema_version="2.0.0"`, `fesa_version`, and
-  `unit_policy="consistent_input_units_no_conversion"`.
+  `unit_policy="consistent_input_units_no_conversion"`, `input_source`, and
+  `input_fingerprint`. `input_source` is the UTF-8 path supplied to the solve
+  request. `input_fingerprint` is `fnv1a64:` followed by the 16 lowercase
+  hexadecimal digits of FNV-1a 64 over the original input bytes; it is a
+  reproducibility identifier, not a cryptographic integrity guarantee.
 - Integer datasets use the stated little-endian fixed-width type. Floating
   datasets use IEEE 754 little-endian `float64`. Strings are variable-length
   UTF-8.
@@ -32,7 +36,7 @@ infer compatibility from a version prefix.
   attributes where listed. `components` is a comma-separated ordered list.
 - Step and frame group names are contiguous decimal indices beginning at zero.
   Phase 1 requires exactly one analysis step and one result step with the same
-  name.
+  name, and exactly one result frame in that step.
 
 ## 3. Required objects