package: ship ksymoff and docs in install + release

Both paths shipped only kasld + components, though docs/exploitation.md
presents ksymoff as the companion symbol-resolution tool and the README
links into docs/.

- Makefile: install ksymoff -> bin/, README/LICENSE/docs/ -> share/doc/kasld/;
  uninstall removes both.
- _cross-build.yml: add extra/ksymoff + docs/ to the release tarball.

Author: bcoles

.github/workflows/_cross-build.yml

@@ -120,6 +120,11 @@ jobs:
           cp -a "${{ steps.builddir.outputs.dir }}/." "${DIR}/"
           find "${DIR}" -name '*.o' -delete
           cp README.md LICENSE "${DIR}/"
+          # Companion symbol-offset tool (arch-independent) + the docs, so the
+          # tarball matches `make install` and the README's doc links resolve.
+          mkdir -p "${DIR}/extra"
+          cp extra/ksymoff "${DIR}/extra/"
+          cp -a docs "${DIR}/docs"
           tar czf "${DIR}.tar.gz" "${DIR}"
           sha256sum "${DIR}.tar.gz" > "${DIR}.tar.gz.sha256"
 

Makefile

@@ -434,13 +434,18 @@ clean :
 install : build
 	install -d "$(DESTDIR)$(PREFIX)/bin"
 	install -m 755 $(KASLD_BIN) "$(DESTDIR)$(PREFIX)/bin/kasld"
+	install -m 755 extra/ksymoff "$(DESTDIR)$(PREFIX)/bin/ksymoff"
 	install -d "$(DESTDIR)$(PREFIX)/libexec/kasld"
 	install -m 755 $(COMP_DIR)/* "$(DESTDIR)$(PREFIX)/libexec/kasld/"
+	install -d "$(DESTDIR)$(PREFIX)/share/doc/kasld"
+	cp -R docs README.md LICENSE "$(DESTDIR)$(PREFIX)/share/doc/kasld/"
 
 .PHONY: uninstall
 uninstall :
 	rm -f "$(DESTDIR)$(PREFIX)/bin/kasld"
+	rm -f "$(DESTDIR)$(PREFIX)/bin/ksymoff"
 	rm -rf "$(DESTDIR)$(PREFIX)/libexec/kasld"
+	rm -rf "$(DESTDIR)$(PREFIX)/share/doc/kasld"
 
 
 # Cross-compile all supported architectures with `make cross` — a local,