Initial commit: Build project architecture, define interfaces, write documentation, with the help of Claude

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diff --git a/include/atp/infer/unification.h b/include/atp/infer/unification.h
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+/*
+ * richard-atp-engine: A saturation-based automated theorem prover for first-order logic.
+ * Copyright (C) 2026 Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
+#pragma once
+
+/// @file unification.h
+/// @brief Most General Unifier (MGU) computation.
+
+#include "atp/core/term_bank.h"
+#include "atp/infer/substitution.h"
+
+namespace atp {
+
+/// Configuration for the unification algorithm.
+struct UnificationConfig {
+    bool enable_occurs_check = false;  ///< Set true for sound but slower unification
+};
+
+/// Attempt to unify two terms, producing a most general unifier.
+/// @return true if unification succeeds, with the MGU in `subst`.
+bool unify(const TermBank& bank, TermId t1, TermId t2, Substitution& subst,
+           const UnificationConfig& config = {});
+
+}  // namespace atp