ci(k9): exempt standards contractile trident dir from the K9!-magic validator

PR #30 added .machine_readable/contractiles/{family}/*.k9.ncl from
hyperpolymath/standards, which broke the `Validate K9 contracts` gate on main:
jtv's k9-validate-action requires a `K9!` magic number + a hunt-level
`signature` field, but standards ships those contractile k9-COMPONENTS as plain
Nickel (no magic / signature) by design — they are trident runner-companions,
not K9!-magic service files.

Add `.machine_readable/contractiles/` to the action's `paths-ignore` (which
REPLACES the default, so the default ignores are reproduced). This restores a
green K9 gate without mangling the standards-sourced files (keeping them
byte-identical to standards) and is the same exemption each repo will need as
the contractile migration rolls out.

Flagged for an estate issue: the two K9 conventions — `K9!`-magic service files
vs Nickel contractile k9-components sharing the `.k9.ncl` extension — should be
reconciled in hyperpolymath/standards + k9-validate-action.

https://claude.ai/code/session_01BJmfoz1ZS1Pejy9LLMY742

Author: claude

.github/workflows/dogfood-gate.yml

@@ -92,6 +92,21 @@ jobs:
         with:
           path: '.'
           strict: 'false'
+          # Default ignores + the standards contractile trident dir. The
+          # contractiles' *.k9.ncl are Nickel k9-COMPONENTS (no K9! magic /
+          # hunt-signature, by design — see hyperpolymath/standards), not
+          # K9!-magic service files, so they are out of scope for this
+          # service-file validator. (paths-ignore REPLACES the action default,
+          # so the default entries are reproduced here.)
+          paths-ignore: |
+            vendor/
+            vendored/
+            verified-container-spec/
+            .audittraining/
+            integration/fixtures/
+            test/fixtures/
+            tests/fixtures/
+            .machine_readable/contractiles/
 
       - name: Write summary
         run: |