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

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diff --git a/include/atp/frontend/tptp_parser.h b/include/atp/frontend/tptp_parser.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 tptp_parser.h
+/// @brief Bridge from ANTLR4-generated parse tree to internal Formula AST.
+
+#include "atp/core/clause.h"
+#include "atp/core/term_bank.h"
+#include "atp/normalize/formula.h"
+
+#include <string>
+#include <vector>
+
+namespace atp {
+
+/// Role of a TPTP formula (axiom, hypothesis, conjecture, etc.)
+enum class FormulaRole : uint8_t {
+    kAxiom,
+    kHypothesis,
+    kConjecture,
+    kNegatedConjecture,
+};
+
+/// A parsed TPTP formula with its name and role.
+struct AnnotatedFormula {
+    std::string name;
+    FormulaRole role;
+    std::unique_ptr<Formula> formula;
+};
+
+/// Parse a TPTP file and return the annotated formulas.
+std::vector<AnnotatedFormula> parseTptpFile(const std::string& filepath, TermBank& bank);
+
+}  // namespace atp