j124 spinner claim: add ConstantSpinner adversary + spinner A/B arms, panel, analyzer

tools/ab/arms_spinner.txt

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+# ─────────────────────────────────────────────────────────────────────────────
+# arms_spinner.txt — the SPINNER-CLAIM A/B (j124, owner claim 1).
+#
+# Claim: "I never seen a gun that learns wall movement or circular movement like
+# spinning bot so fast - like a gun made on purpose for those movements."
+#
+# Three arms, identical frozen binary, MOVEMENT PINNED (`TR_MOVEMENT=strafe`) in
+# every arm (same standard as the gun campaign). Only the gun rack differs.
+# Format:  name | ENV=value ENV=value | label
+# ─────────────────────────────────────────────────────────────────────────────
+
+# 1. REFERENCE — shipped onlyPattern rack, movement pinned.
+pattern | TR_MOVEMENT=strafe | shipped onlyPattern rack (REFERENCE)
+
+# 2. BitBrain learned-gain, decay memory (the config the owner most likely ran;
+#    the arm used in the 32-opponent gauntlet and both j121 batches).
+bitbrain | TR_MOVEMENT=strafe TR_RACK_PATTERN=off TR_RACK_BITBRAIN=both TR_BITBRAIN_GAINS=1.0,1.25,1.5,2.0 TR_BITBRAIN_MEM=decay | BitBrain-only, learned gain, decay
+
+# 3. BitBrain learned-gain, RETAINED memory (the "adapt across the whole battle"
+#    mode the owner described; not previously panel-tested).
+bitbrain_ret | TR_MOVEMENT=strafe TR_RACK_PATTERN=off TR_RACK_BITBRAIN=both TR_BITBRAIN_GAINS=1.0,1.25,1.5,2.0 TR_BITBRAIN_MEM=retained | BitBrain-only, learned gain, retained