Add search self-tests (hash consistency, QSearch sanity) and a native EPD parser (`epd` command + ParseEpdRecord), fixing a silent-corruption bug in convert_epd.pl that broke every Black-to-move EPD conversion.

testsearch.c: TestSearchHashConsistency exercises the hash table through real search (repeat-with-warm-table and shallow-then-deep agreement) rather than synthetic store/probe calls. TestQSearchSanity checks termination and a node-count ceiling; its own header documents that the TEST=1 self-test build doesn't define PERF_COUNTERS, so it checks whole-search node count rather than the qsearch-only counter. A planned null-move zugzwang test was dropped in favor of tests/zugzwang.epd (best-move outcome, not an internal counter) after the three classic literature positions turned out not to structurally reach this engine's verification-search code path on this build.

fen.c/script.c/command.c: new `epd <file>` command reads raw EPD directly via ParseEpdRecord, reusing ScriptCommand's existing suite-reporting machinery (factored into _ProcessSuiteLine/_PrintSuiteReport). Replaces the need for tests/convert_epd.pl, which had a real bug: its bm/am regex's [^b]+ filler breaks on any Black-to-move record (side-to-move field is literally "b"), and unscoped $fen/$id/$solution globals meant a failed match silently duplicated the previous record instead of erroring.

tests/ep_to_epd.pl converts the existing setboard/solution/avoid/id/go suites back to real EPD; cross-checked ecm_ringers.ep_ via `script` against ecm_ringers.epd via `epd` -- byte-identical node counts and solve stats. Added .epd siblings for every genuine tactical suite in tests/.

Added src/TESTING_PLAN.md: full audit of test*.c coverage gaps (dead SEE oracle, unwired eval/recognizer tests, zero hash-table correctness coverage, thin search self-tests) with a prioritized plan for closing them.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/ecm_late.epd b/tests/ecm_late.epd
new file mode 100644
index 0000000..0b050fa
--- /dev/null
+++ b/tests/ecm_late.epd
@@ -0,0 +1,25 @@
+2rr2k1/1b3p1p/p4qpb/2R1n3/3p4/BP2P3/P3QPPP/3R1BKN b - - bm Rxc5; id "ECM.016";
+8/p3q1kp/1p2Pnp1/3pQ3/2pP4/1nP3N1/1B4PP/6K1 w - - bm Ba3; id "ECM.146";
+2r2rk1/1p1q1ppp/1p3n2/3p1N2/4n3/1N3Q2/PPP2PPP/R2R2K1 w - - bm Rxd5; id "ECM.196";
+2r1qrk1/pp1b1ppp/4pn2/n1b5/8/2NQ1NP1/PP1BPPBP/R2R2K1 w - - bm b4; id "ECM.297";
+r2qrbk1/1p4pb/2n2p1p/pNpn4/2N5/PP1PPQPB/1B5P/2R2RK1 w - - bm Nbd6; id "ECM.313";
+rkb2qr1/1p5p/pQ1bp3/3p2B1/5n2/3B1N2/PP3PPP/2R2RK1 w - - bm Rxc8+; id "ECM.332";
+1r2r1k1/1pqb2pp/p2bp1n1/2p3BQ/3pN3/1P1P2P1/P1P3BP/4RRK1 w - - bm Bd8; id "ECM.370";
+r3bb2/P1q3k1/Q2p3p/2pPp1pP/2B1P3/2B5/6P1/R5K1 w - - bm Bxe5+; id "ECM.379";
+3r1r2/1b4bk/p1n3pp/1p2p3/4P3/q1P1QNB1/B4RPP/5RK1 w - - bm Bh4; id "ECM.438";
+2k3r1/1ppr3p/p1pB2q1/6n1/N3Pp2/8/PPP1Q1PP/3R1RK1 b - - bm f3; id "ECM.448";
+r1bqr2k/ppp2p1p/5b2/3Pn1p1/1PP1Bp2/8/PB2N1PP/R2Q1RK1 w - - bm Nxf4; id "ECM.504";
+r3k2r/1p1b1p2/p3p3/2b3p1/4N1n1/1B5P/PPP3P1/R1B2R1K b kq - bm Bc6; id "ECM.506";
+6k1/1q2rpp1/p6p/P7/1PB1n3/5Q2/6PP/5R1K w - - bm b5; id "ECM.615";
+r5r1/8/bRP1pk1p/3pNp2/5P2/7P/PR4P1/6K1 w - - bm Rxa6; id "ECM.616";
+2r1rbk1/p1Bq1ppp/Ppn1b3/1Npp4/B7/3P2Q1/1PP2PPP/R4RK1 w - - bm Nxa7; id "ECM.635";
+r2qrbk1/5ppp/pn1p4/np2P1P1/3p4/5N2/PPB2PP1/R1BQR1K1 w - - bm Bxh7+; id "ECM.654";
+r2q1rk1/3n1ppp/8/1pbP2P1/p1N4P/PnBBPQ2/5P2/R3K2R w KQ - bm Bxh7+; id "ECM.697";
+r3r1k1/pp3pp1/3p4/2q4p/2P5/1PB2Q1P/n4PP1/3R1RK1 w - - bm Bxg7; id "ECM.713";
+r2rn3/1p3pk1/p1pNn1pp/q3P3/P7/1PN4P/2QR1PP1/3R2K1 w - - bm Nxf7; id "ECM.764";
+rn2r1k1/pp3p1p/3P2p1/2p1bbB1/2B5/2N5/Pq4PP/R2Q1RK1 w - - bm Bxf7+; id "ECM.767";
+2r1r1k1/pb1n1pp1/1p1qpn1p/4N1B1/2PP4/3B4/P2Q1PPP/3RR1K1 w - - bm Bxh6; id "ECM.789";
+4rrk1/p5pp/1p4q1/3p2n1/2pP2P1/P1P1PP2/3B2K1/1R2QR2 b - - bm Nxf3; id "ECM.824";
+r1bq1rk1/1p2bppp/p3p3/n3P3/4N3/1P1P1N2/PB4PP/R3QR1K w - - bm Nf6+; id "ECM.829";
+r1bq1rk1/ppp3p1/7p/3P2n1/2PQ1p2/1N5P/PPP2PPK/R1B2R2 b - - bm Nf3+; id "ECM.831";
+6k1/1R4pp/2p5/8/P1rNp3/6Pb/4PK2/8 w - - bm a5; id "ECM.878";