Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@bindings/go/configuration/generic/v1/spec/filter.go`:
- Around line 18-23: Add nil guards at the start of the exported function
FilterWithRemainder: validate that the input pointers config and options are not
nil and return a clear error (and nils for the two *Config return values) if
either is nil, to avoid dereferencing panics in lines that access config.Type,
config.Configurations, or options.ConfigTypes; also treat a nil
options.ConfigTypes as an empty slice (or let slices.Contains handle it) but do
not assume options itself is non-nil. Ensure the error message clearly names the
offending parameter and reference the function FilterWithRemainder in your
change.

---

Nitpick comments:
In `@bindings/go/configuration/generic/v1/spec/filter_test.go`:
- Around line 116-167: Update TestFilterWithRemainder to include two additional
table-driven cases: one where options == nil (treat as empty options) using a
non-nil Config with entries and assert that filtered is nil and remainder
contains all entries, and one where config == nil (pass nil as the first arg to
FilterWithRemainder and options non-nil or nil) and assert that an error is
returned. Reference the existing TestFilterWithRemainder table, the
FilterWithRemainder function, and types Config and FilterOptions when adding
these cases so the test verifies nil-options behave like empty FilterOptions and
nil-config produces an error.