chore: repoint eyrie submodule after history rewrite and harden hooks

Strip Co-authored-by from rewritten hawk history; sync external/eyrie to
eyrie main 2f5efc2, add prepare-commit-msg lefthook strip, gitignore .githooks/.

Author: Patel230

.gitignore

@@ -25,3 +25,6 @@ hawk
 
 # Test artifacts
 coverage.out
+
+# Lefthook-generated git hook wrappers
+.githooks/

external/eyrie

@@ -130,3 +130,12 @@ commit-msg:
         # Strip Co-authored-by: trailers that AI tools (Claude, Cursor, etc.) add.
         # This enforces the rule that commits list only the human author.
         sed '/^[Cc]o-[Aa]uthored-[Bb]y:/d' "{1}" > "{1}.tmp" && mv "{1}.tmp" "{1}"
+
+# ---------------------------------------------------------------------------
+# prepare-commit-msg — strip AI co-author trailers after tools inject them.
+# ---------------------------------------------------------------------------
+prepare-commit-msg:
+  commands:
+    strip-co-authored-by:
+      run: |
+        sed '/^[Cc]o-[Aa]uthored-[Bb]y:/d' "{1}" > "{1}.tmp" && mv "{1}.tmp" "{1}"