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`nx_dyna_bind_skin_gate.nx` source

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1// nx_dyna_bind_skin_gate.nx -- THE MOTION GATE: one tooth per NAMED failure mode, every bound READ
2// FROM knowledge/gamefeel_oracle.conf, never written here.
3//
4// WHY THE TEETH ARE SHAPED THIS WAY. The operator's bar is that the motion be best-of-breed and
5// that previous attempts were awful. "Awful" is not one thing, so a single "it deformed" tooth
6// would pass the exact solver we are trying to beat. Each recognisable way secondary motion reads
7// as wrong therefore gets its OWN tooth with its OWN derived bound:
8//   dead      -- no visible secondary motion. Tooth: the excitation must actually reach the plant.
9//   jelly     -- under-damped, never settles. Tooth: residual excursion must decay.
10//   buzzing   -- unstable at the substep. Tooth: the measured natural frequency must be far below
11//                the sampling rate; a plant that "oscillates" AT the sample rate is quantization
12//                chatter, which is exactly the defect this lane hit and fixed on 2026-08-23.
13//   unobservable -- a profile whose response does not complete a period inside the window. Tooth:
14//                that must report UNOBSERVABLE and must NOT be scored as a pass. An instrument
15//                that cannot see must abstain, never acquit.
16//   swimming/symmetry -- the binding must DISCRIMINATE: some skin vertices bound to a region and
17//                some skin-locked. Both signals present at once, or the tooth proves nothing.
18// The plant-vs-subject comparison (fn, zeta) is REPORTED against the cited bands. It is deliberately
19// NOT a pass/fail tooth in this gate: knowledge/gamefeel_oracle.conf itself records that our two
20// shipped profiles bracket the human band, so failing the build on it would be failing on a
21// modelling result rather than on a regression. The numbers are printed every run so the movement
22// is visible, and the ratchet belongs in the profile lane that owns those constants.
23//
24// SUBJECT: ./nx_dyna_bind_skin.elf -- the promoted binary, forked. Subprocess capture comes from
25// nx_gatekit_lib because a hand-rolled pipe DEADLOCKED a sibling gate in production today
26// (pid 2240, 50+ minutes in pipe_wait). Never re-roll that plumbing.
27// license_tier: ORIGINAL   No hw writes (Rule 26).   expect_exit: 0
28import "nx_syscalls.nx"
29import "nx_gate_verdict.nx"
30import "nx_gatekit_lib.nx"
31
32const DG_ELF: *u8 = "./nx_dyna_bind_skin.elf"
33const DG_CONF: *u8 = "knowledge/gamefeel_oracle.conf"
34const DG_CAP: i64 = 65536
35const DG_AMP_CMM: i64 = 3200
36
37// Sample geometry of the probe, mirrored here ONLY to derive the buzz bound. The probe samples one
38// point per solver reference step, so its Nyquist limit is half that rate; a plant reporting a
39// natural frequency anywhere near it is chatter, not physics. Nyquist is arithmetic, not a taste.
40const DG_DT_US: i64 = 4167
41const DG_US_PER_S: i64 = 1000000
42const DG_MHZ: i64 = 1000
43// SIGN CHANGES NEEDED BEFORE A PERIOD EXISTS. DERIVED FROM THE SUBJECT, NOT CHOSEN: dbs_analyze
44// records the first three sign changes as c1/c2/c3 and sets fn_mhz ONLY inside
45// `if c1 > 0 { if c3 > c1 {`, because c1 -> c3 is what spans one full period. So three crossings
46// is exactly the subject's own precondition for reporting a frequency at all -- change that shape
47// and this number must move with it.
48const DG_CROSS_FOR_PERIOD: i64 = 3
49
50func dg_slen(s: *u8) -> i64 { var n: i64 = 0; while s[n] != (0 as u8) { n = n + 1 } return n }
51
52// read a "key<TAB>min<TAB>max<TAB>..." row, ANCHORED at line start so a key appearing inside a
53// source field can never be mistaken for a row. Explicit stop flags: clobbering the cursor to exit
54// a scan is the banked sentinel defect and it destroys the very position the caller needs.
55func dg_band(b: *u8, n: i64, key: *u8, out: *i64) -> i64 {
  let kl: i64 = dg_slen(key)
  var i: i64 = 0
  var at_ls: i64 = 1
  var found: i64 = 0
  while i < n {
      if found == 0 {
          if at_ls == 1 {
              var hit_k: i64 = 1
              var m: i64 = 0
              while m < kl {
                  if i + m >= n { hit_k = 0; m = kl }
                  else {
                      if b[i + m] != key[m] { hit_k = 0; m = kl }
                      else { m = m + 1 }
                  }
              }
              if hit_k == 1 {
                  if i + kl < n {
                      if b[i + kl] == (9 as u8) {
                          var p: i64 = i + kl + 1
                          var v1: i64 = 0
                          var st1: i64 = 0
                          while st1 == 0 {
                              if p >= n { st1 = 1 }
                              else {
                                  let c: i64 = b[p] as i64
                                  if c >= 48 {
                                      if c <= 57 { v1 = v1 * 10 + (c - 48); p = p + 1 }
                                      else { st1 = 1 }
                                  } else { st1 = 1 }
                              }
                          }
                          if p < n {
                              if b[p] == (9 as u8) {
                                  var q: i64 = p + 1
                                  var v2: i64 = 0
                                  var st2: i64 = 0
                                  while st2 == 0 {
                                      if q >= n { st2 = 1 }
                                      else {
                                          let c2: i64 = b[q] as i64
                                          if c2 >= 48 {
                                              if c2 <= 57 { v2 = v2 * 10 + (c2 - 48); q = q + 1 }
                                              else { st2 = 1 }
                                          } else { st2 = 1 }
                                      }
                                  }
                                  out[0] = v1
                                  out[1] = v2
                                  found = 1
                              }
                          }
                      }
                  }
              }
          }
          if b[i] == (10 as u8) { at_ls = 1 } else { at_ls = 0 }
      }
      i = i + 1
  }
  return found
117}
118
119// pull the integer that follows a key inside the probe's own output line
120func dg_after(buf: *u8, n: i64, key: *u8) -> i64 {
  let kl: i64 = dg_slen(key)
  var i: i64 = 0
  while i + kl < n {
      var m: i64 = 0
      var hit_k: i64 = 1
      while m < kl {
          if buf[i + m] != key[m] { hit_k = 0; m = kl } else { m = m + 1 }
      }
      if hit_k == 1 {
          var p: i64 = i + kl
          var neg: i64 = 0
          if p < n { if buf[p] == (45 as u8) { neg = 1; p = p + 1 } }
          var v: i64 = 0
          var st: i64 = 0
          var got: i64 = 0
          while st == 0 {
              if p >= n { st = 1 }
              else {
                  let c: i64 = buf[p] as i64
                  if c >= 48 {
                      if c <= 57 { v = v * 10 + (c - 48); p = p + 1; got = 1 }
                      else { st = 1 }
                  } else { st = 1 }
              }
          }
          if got == 1 { if neg == 1 { return 0 - v } return v }
      }
      i = i + 1
  }
  return 0 - 1
151}
152
153func dg_ringdown(prof: *u8, buf: *u8, blen: *i64) -> i64 {
  return gk_run_capture(DG_ELF, "ringdown" as *u8, prof, "3200" as *u8, 0 as *u8, buf, DG_CAP, blen)
155}
156
157func dg_ringdown_amp(prof: *u8, amp: *u8, buf: *u8, blen: *i64) -> i64 {
  return gk_run_capture(DG_ELF, "ringdown" as *u8, prof, amp, 0 as *u8, buf, DG_CAP, blen)
159}
160
161func main(argc: i64, argv: *i64) -> i64 {
  let ctr: *i64 = gv_ctr()
  gv_puts("nx_dyna_bind_skin_gate -- one tooth per named motion failure mode, bounds read from the conf\n\n" as *u8)
164
  // ---- bounds come from the conf, never from this file ----
  let clp: *i64 = sys_mmap(16) as *i64
  let cb: *u8 = sys_read_file(DG_CONF, clp)
  var have_conf: i64 = 0
  if (cb as i64) != 0 { have_conf = 1 }
  gv_check("conf-readable (bounds are DATA; a gate that cannot read them must not invent them)" as *u8, have_conf, ctr)
  let band: *i64 = sys_mmap(32) as *i64
  var fn_lo: i64 = 0
  var fn_hi: i64 = 0
  var ze_lo: i64 = 0
  var ze_hi: i64 = 0
  var amp_lo: i64 = 0
  var amp_hi: i64 = 0
  if have_conf == 1 {
      let n: i64 = clp[0]
      if dg_band(cb, n, "tissue_fn_mhz" as *u8, band) == 1 { fn_lo = band[0]; fn_hi = band[1] }
      if dg_band(cb, n, "tissue_zeta_permil" as *u8, band) == 1 { ze_lo = band[0]; ze_hi = band[1] }
      if dg_band(cb, n, "tissue_amp_walk_mm" as *u8, band) == 1 { amp_lo = band[0]; amp_hi = band[1] }
  }
  gv_puts("  subject rows: tissue_fn_mhz=" as *u8); gv_num(fn_lo); gv_puts(".." as *u8); gv_num(fn_hi)
  gv_puts("  tissue_zeta_permil=" as *u8); gv_num(ze_lo); gv_puts(".." as *u8); gv_num(ze_hi)
  gv_puts("  tissue_amp_walk_mm=" as *u8); gv_num(amp_lo); gv_puts(".." as *u8); gv_num(amp_hi); gv_puts("\n" as *u8)
  var rows_ok: i64 = 0
  if fn_lo > 0 { if ze_lo > 0 { if amp_lo > 0 { rows_ok = 1 } } }
  gv_check("all-three-subject-rows-present (an absent row must not read as a zero bound)" as *u8, rows_ok, ctr)
190
  let buf: *u8 = sys_mmap(DG_CAP)
  let bl: *i64 = sys_mmap(16) as *i64
193
  // ---- LARGE_SOFT: the operator's primary case ----
  let rc0: i64 = dg_ringdown("0" as *u8, buf, bl)
  gv_check("probe-runs-and-exits-zero (127 = the elf is absent, the stale-offc tell)" as *u8, rc0 == 0, ctr)
  let n0: i64 = bl[0]
  let cell0: i64 = dg_after(buf, n0, "cell_mm=" as *u8)
  let mx0: i64 = dg_after(buf, n0, "maxabs_cmm=" as *u8)
  let rs0: i64 = dg_after(buf, n0, "residual_cmm=" as *u8)
  let fn0: i64 = dg_after(buf, n0, "fn_mhz=" as *u8)
  let ze0: i64 = dg_after(buf, n0, "zeta_permil=" as *u8)
  let cr0: i64 = dg_after(buf, n0, "crossings=" as *u8)
  gv_puts("  [LARGE_SOFT] cell_mm=" as *u8); gv_num(cell0)
  gv_puts(" maxabs_cmm=" as *u8); gv_num(mx0)
  gv_puts(" residual_cmm=" as *u8); gv_num(rs0)
  gv_puts(" crossings=" as *u8); gv_num(cr0)
  gv_puts(" fn_mhz=" as *u8); gv_num(fn0)
  gv_puts(" zeta_permil=" as *u8); gv_num(ze0); gv_puts("\n" as *u8)
210
  // the lattice step must be DERIVED, and a derived step is a real one
  gv_check("lattice-step-derived-and-nondegenerate (a one-cell cage silently reports zeros)" as *u8, cell0 > 0, ctr)
213
  // ANTI-VACUITY: the excitation must actually reach the plant, or every later tooth is vacuous.
  // Bound: the response must reach at least half the commanded amplitude. Half is not a taste --
  // it is the point at which the plant has absorbed more of the excitation than it returned, so
  // anything below it means the drive never coupled.
  gv_check("fixture-reached-the-condition (the excitation actually moved the plant)" as *u8, mx0 > DG_AMP_CMM / 2, ctr)
219
  // DEAD: the walking excitation is a REAL measured amplitude (tissue_amp_walk_mm). If the plant
  // cannot express it, the motion reads as dead. Bound is the conf row, converted mm -> cmm.
  var dead_ok: i64 = 0
  if amp_lo > 0 { if mx0 >= amp_lo * 100 / 2 { dead_ok = 1 } }
  gv_check("not-DEAD (response reaches the measured walking amplitude scale)" as *u8, dead_ok, ctr)
225
  // JELLY: after the window the excursion must have collapsed. Bound: the residual must be under
  // one part in a hundred of the peak -- derived from the peak itself, so it scales with any
  // excitation rather than pinning a length.
  var jelly_ok: i64 = 0
  if mx0 > 0 { if rs0 * 100 < mx0 { jelly_ok = 1 } }
  gv_check("not-JELLY (residual decayed to under one percent of peak)" as *u8, jelly_ok, ctr)
232
  // BUZZ: a plant reporting a natural frequency near the sampling Nyquist is quantization
  // chatter, not tissue. This tooth is the regression guard for the exact defect measured and
  // fixed on 2026-08-23, when an extrema detector reported fn == the sample rate.
  let nyq_mhz: i64 = DG_US_PER_S * DG_MHZ / (2 * DG_DT_US)
  var buzz_ok: i64 = 0
  if fn0 > 0 { if fn0 * 4 < nyq_mhz { buzz_ok = 1 } }
  gv_puts("  nyquist_mhz=" as *u8); gv_num(nyq_mhz); gv_puts("\n" as *u8)
  gv_check("not-BUZZING (natural frequency far below the sampling Nyquist)" as *u8, buzz_ok, ctr)
241
  // DETERMINISM: same command, same numbers. A stochastic solver cannot be gated at all.
  let buf2: *u8 = sys_mmap(DG_CAP)
  let bl2: *i64 = sys_mmap(16) as *i64
  let rc0b: i64 = dg_ringdown("0" as *u8, buf2, bl2)
  let fn0b: i64 = dg_after(buf2, bl2[0], "fn_mhz=" as *u8)
  let ze0b: i64 = dg_after(buf2, bl2[0], "zeta_permil=" as *u8)
  var det_ok: i64 = 0
  if rc0b == 0 { if fn0b == fn0 { if ze0b == ze0 { det_ok = 1 } } }
  gv_check("DETERMINISTIC (same command, identical fn and zeta)" as *u8, det_ok, ctr)
251
  // UNOBSERVABLE IS NOT A PASS -- AND THIS TOOTH NOW ASSERTS THE CONTRACT, NOT ONE OBSERVATION.
  // WHAT IT USED TO SAY, AND WHY IT WENT RED (measured 2026-08-28, gate read 14/15):
  //   `if fn2 == 0 { abst_ok = 1 }`, on the premise that "GLUTE is heavily damped and does not
  //   complete a period inside the window". Measured directly on the live binary, GLUTE now reads
  //   crossings=8 fn_mhz=3333 period_us=300024 -- so the PREMISE IS STALE and the tooth was
  //   failing because THE PLANT BECAME MORE OBSERVABLE, which reads exactly like a regression.
  // ★A TOOTH THAT PINS A MEASURED VALUE INSTEAD OF THE INVARIANT IT PROTECTS GOES RED WHEN ITS
  //   SUBJECT IMPROVES, AND THE RED IS INDISTINGUISHABLE FROM A REAL FAULT.
  // THE INVARIANT is that the organ must never report a frequency it did not observe. dbs_analyze
  // sets fn ONLY once c1->c3 spans a full period, so `fn > 0` and `crossings >= DG_CROSS_FOR_PERIOD`
  // are the SAME claim: either one true without the other is a FABRICATED or a SUPPRESSED reading.
  // Asserted as a biconditional, so it holds for ANY profile and cannot go stale on a solver fix.
  let buf3: *u8 = sys_mmap(DG_CAP)
  let bl3: *i64 = sys_mmap(16) as *i64
  let rc2: i64 = dg_ringdown("2" as *u8, buf3, bl3)
  let n2: i64 = bl3[0]
  let fn2: i64 = dg_after(buf3, n2, "fn_mhz=" as *u8)
  let mx2: i64 = dg_after(buf3, n2, "maxabs_cmm=" as *u8)
  let cr2: i64 = dg_after(buf3, n2, "crossings=" as *u8)
  gv_puts("  [GLUTE] maxabs_cmm=" as *u8); gv_num(mx2)
  gv_puts(" crossings=" as *u8); gv_num(cr2)
  gv_puts(" fn_mhz=" as *u8); gv_num(fn2); gv_puts("\n" as *u8)
  // dg_after returns -1 for a field absent from the output. Without this conjunct a MISSING
  // crossings= would read as "fewer than three" and would SATISFY the abstain arm below -- a
  // tooth passing because it could not look.
  var have_cr2: i64 = 0
  if cr2 >= 0 { have_cr2 = 1 }
  gv_check("crossings-field-present (a tooth must not be satisfied by a field it failed to parse)" as *u8, have_cr2, ctr)
  var abst_ok: i64 = 0
  if rc2 == 0 { if mx2 > 0 { if have_cr2 == 1 {
      if fn2 == 0 { if cr2 <  DG_CROSS_FOR_PERIOD { abst_ok = 1 } }
      if fn2 >  0 { if cr2 >= DG_CROSS_FOR_PERIOD { abst_ok = 1 } }
  } } }
  gv_check("period-report-matches-period-evidence (fn>0 IFF a full period was actually observed: no fabricated frequency, and no suppressed one)" as *u8, abst_ok, ctr)
  // HONEST SCOPE, NAMED RATHER THAN HIDDEN: with GLUTE now completing 8 crossings, NO shipped
  // profile exercises the fn==0 arm of that biconditional today, so the tooth is ONE-SIDED ON
  // CURRENT DATA. The arm is kept because it costs nothing and re-arms itself the moment any
  // profile stops completing a period -- and the run says which arm it took.
  if fn2 == 0 { gv_puts("  NOTE: GLUTE abstained (fn=0) -- the UNOBSERVABLE arm WAS exercised this run\n" as *u8) }
  if fn2 >  0 { gv_puts("  NOTE: GLUTE completes a period on this build, so the UNOBSERVABLE arm of the abstention contract is NOT exercised by any shipped profile today\n" as *u8) }
292
  // NEG-CONTROL: a profile index the solver has no table for must REFUSE, not return a silent
  // zero-motion pass. Good leg is the real profile that must NOT refuse.
  let buf4: *u8 = sys_mmap(DG_CAP)
  let bl4: *i64 = sys_mmap(16) as *i64
  let rcbad: i64 = dg_ringdown("99" as *u8, buf4, bl4)
  gv_bite("neg-control-unknown-profile-refused-and-real-profile-admitted" as *u8, rcbad != 0, rc0 != 0, ctr)
299
  // ---- THE LINEAR LIMIT: compare like with like -------------------------------------------
  // WHY A SMALL AMPLITUDE IS THE CORRECT ONE, AND WHY IT IS NOT TUNING TO HIT THE BAND. The
  // subject row tissue_fn_mhz carries its own provenance: "free-vibration-modes". A free
  // vibration IS a small-amplitude measurement. Exciting our plant at tissue_amp_walk_mm (a
  // DRIVEN walking excursion of 32 mm) and comparing that to a free-vibration band was a
  // category error in the PROBE, not a property of the solver. Measured 2026-08-23 on
  // LARGE_SOFT: at 32 mm the up/down ratio is 1.139 and fn sits BELOW the band; at 3.2 mm the
  // ratio is 1.017 and fn sits INSIDE it. The amplitude is therefore DERIVED FROM THE BAND'S
  // OWN PROVENANCE, and the linearity tooth below is what keeps that honest rather than
  // convenient: if the branches did NOT converge we would not be in the regime the subject was
  // measured in, and no comparison would be admissible at all.
  let bs: *u8 = sys_mmap(DG_CAP)
  let bls: *i64 = sys_mmap(16) as *i64
  let bd: *u8 = sys_mmap(DG_CAP)
  let bld: *i64 = sys_mmap(16) as *i64
  let rcu: i64 = dg_ringdown_amp("0" as *u8, "320" as *u8, bs, bls)
  let rcd: i64 = dg_ringdown_amp("0" as *u8, "-320" as *u8, bd, bld)
  let fnu: i64 = dg_after(bs, bls[0], "fn_mhz=" as *u8)
  let fnd: i64 = dg_after(bd, bld[0], "fn_mhz=" as *u8)
  let zeu: i64 = dg_after(bs, bls[0], "zeta_permil=" as *u8)
  let zed: i64 = dg_after(bd, bld[0], "zeta_permil=" as *u8)
  let mxu: i64 = dg_after(bs, bls[0], "maxabs_cmm=" as *u8)
  let mxd: i64 = dg_after(bd, bld[0], "maxabs_cmm=" as *u8)
  gv_puts("  [LINEAR LIMIT +-320 cmm] up fn=" as *u8); gv_num(fnu)
  gv_puts(" zeta=" as *u8); gv_num(zeu)
  gv_puts(" maxabs=" as *u8); gv_num(mxu)
  gv_puts(" | down fn=" as *u8); gv_num(fnd)
  gv_puts(" zeta=" as *u8); gv_num(zed)
  gv_puts(" maxabs=" as *u8); gv_num(mxd); gv_puts("\n" as *u8)
329
  // FIXTURE-REACHED, BOTH SIGNS. The absence of exactly this check is what let the probe excite
  // upward only, measure one branch of an asymmetric plant, and report it as the whole -- the
  // coverage error corrected on 2026-08-23. This gate cannot repeat it.
  var both_excited: i64 = 0
  if rcu == 0 { if rcd == 0 { if mxu > 0 { if mxd > 0 { both_excited = 1 } } } }
  gv_check("fixture-reached-BOTH-signs (a one-sided sweep measures one branch and reports it as the plant)" as *u8, both_excited, ctr)
336
  // LINEARITY: branches must converge at small amplitude. Bound is one tenth -- a tenth is the
  // scale at which the measured ratio (1.017) is unambiguously separated from the large-
  // amplitude ratio (1.139), so it discriminates the two regimes we actually observed.
  var lin_ok: i64 = 0
  if fnu > 0 { if fnd > 0 {
      var hi: i64 = fnu
      var lo: i64 = fnd
      if fnd > fnu { hi = fnd; lo = fnu }
      if (hi - lo) * 10 < lo { lin_ok = 1 }
  } }
  gv_check("LINEAR-REGIME-REACHED (branches converge, so the free-vibration band is applicable)" as *u8, lin_ok, ctr)
348
  var inband_fn: i64 = 0
  if lin_ok == 1 { if fnu >= fn_lo { if fnu <= fn_hi { if fnd >= fn_lo { if fnd <= fn_hi { inband_fn = 1 } } } } }
  gv_check("plant-fn-IN-SUBJECT-BAND-at-the-linear-limit (both branches)" as *u8, inband_fn, ctr)
  var inband_ze: i64 = 0
  if lin_ok == 1 { if zeu >= ze_lo { if zeu <= ze_hi { if zed >= ze_lo { if zed <= ze_hi { inband_ze = 1 } } } } }
  gv_check("plant-zeta-IN-SUBJECT-BAND-at-the-linear-limit (both branches)" as *u8, inband_ze, ctr)
355
  gv_puts("\n  PLANT vs SUBJECT (reported, not gated -- the profile constants are owned elsewhere):\n" as *u8)
  gv_puts("    LARGE_SOFT fn=" as *u8); gv_num(fn0); gv_puts(" mhz vs band " as *u8); gv_num(fn_lo)
  gv_puts(".." as *u8); gv_num(fn_hi); gv_puts("   zeta=" as *u8); gv_num(ze0)
  gv_puts(" permil vs band " as *u8); gv_num(ze_lo); gv_puts(".." as *u8); gv_num(ze_hi); gv_puts("\n" as *u8)
360
  return gv_verdict("NX-DYNA-BIND-SKIN" as *u8, ctr, "secondary motion is measured against cited biomechanics, and each way it can read as awful has its own tooth" as *u8)
362}
nx_dyna_bind_skin_gate.nx source

`nx_dyna_bind_skin_gate.nx` source
