Add MarkovJunior 16D PIST rewrite shim documentation

6-Documentation/famm/MARKOVJUNIOR_16D_PIST_REWRITE_SHIM.md

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+# MarkovJunior 16D PIST Rewrite Shim
+
+## Purpose
+
+Add a shim that treats MarkovJunior-style rewrite programs as 16D FAMM/PIST/NUVMAP objects.
+
+This is an adapter, not a replacement for MarkovJunior. MarkovJunior provides the rewrite-rule grammar and constraint-propagation style. The shim projects those rules into the current project stack:
+
+```text
+MarkovJunior rule
+→ 16D rewrite anchor
+→ PIST transition candidate
+→ FAMM scar/residual accounting
+→ NUVMAP rewrite-basin address
+→ Delta-DAG replay edge
+→ BJW cleanup / exact receipt
+```
+
+## Why MarkovJunior fits
+
+MarkovJunior programs are built from rewrite rules. In basic form, a program is an ordered list of rewrite rules. A rule match is selected and applied on the grid, and the process halts when no rules match. MarkovJunior also supports probabilistic inference through constraint propagation.
+
+Project translation:
+
+```text
+rewrite rule       = PIST surface-transition operator
+rule match         = local state crossing
+changed cells      = delta edge
+failed constraint  = FAMM scar
+inference field    = Semantic Mass / route pressure
+trace              = NUVMAP Delta-DAG
+```
+
+## 16D rewrite state
+
+```math
+X_{\mathrm{MJ}}
+=
+[
+\nu,
+s,
+m_L,
+m_\Delta,
+h_{\mathrm{rule}},
+p_{\mathrm{obs}},
+\chi,
+\mu,
+z,
+\Delta_{\mathrm{mem}},
+\Omega,
+R,
+I,
+C,
+\rho,
+\pi
+]
+```
+
+| Axis | Meaning |
+|---:|---|
+| 0 | NUVMAP rewrite-state address |
+| 1 | S3C shell / dimensional shell |
+| 2 | left-pattern mass |
+| 3 | rewrite delta mass |
+| 4 | rule hash / rule-order pressure |
+| 5 | observation / constraint pressure |
+| 6 | chirality / orientation |
+| 7 | semantic mass |
+| 8 | recurrence / Z-domain lane |
+| 9 | delta-memory state |
+| 10 | FAMM scar pressure |
+| 11 | residual / unsatisfied constraint |
+| 12 | invariant overlap |
+| 13 | route cost |
+| 14 | receipt strength |
+| 15 | projection / display gauge |
+
+## Rule anchor
+
+```math
+A_r
+=
+\operatorname{Embed}_{16D}
+(
+H(L_r),
+H(R_r),
+\|L_r\|,
+\|R_r-L_r\|,
+\mathrm{wildcards},
+\mathrm{weight},
+\mathrm{constraints}
+)
+```
+
+Where `L_r` is the left pattern and `R_r` is the right pattern.
+
+## PIST transition law
+
+```math
+X_{t+1}
+=
+\Pi_{\mathrm{adm}}
+\left[
+\mathrm{PIST}_{r_t}(X_t)
++
+\Delta_{\mathrm{MJ}}(r_t,m_t)
+\right]
+```
+
+## Rule score
+
+```math
+P(r_t=i\mid X_t)
+\propto
+\exp[
+-\alpha d_i
+-\beta\Omega_i
+-\kappa K_i
++\gamma I_i
+-\eta C_i
++\lambda\mu_i
++\rho R_i
++\chi H_i
+]
+```
+
+This makes MarkovJunior rule selection compatible with semantic mass, scar pressure, coarsening pressure, invariant overlap, route cost, receipt strength, and chirality compatibility.
+
+## Coarsening-agent behavior
+
+```text
+failed rewrite
+→ residual measured
+→ scar written
+→ basin coarsened
+→ future matching downweighted
+→ route reopened only if new evidence changes the boundary
+```
+
+## Boundary
+
+This shim does not execute full MarkovJunior XML semantics. It is a projection layer. It maps MarkovJunior-style rewrite rules and traces into the 16D project state so they can be routed, scored, replayed, and receipted.
+
+## Project sentence
+
+The MarkovJunior shim lets the project treat local rewrite rules as 16D surface-transition anchors: MarkovJunior supplies the rewrite grammar, PIST supplies lawful motion, FAMM tracks scars and residuals, NUVMAP stores rewrite basins, and Delta-DAG receipts the replay path.