diff --git a/applications/collatz/collatz_k_scripts/collatz_generate_run_report.py b/applications/collatz/collatz_k_scripts/collatz_generate_run_report.py
index 55b56c2..3b73c6b 100644
--- a/applications/collatz/collatz_k_scripts/collatz_generate_run_report.py
+++ b/applications/collatz/collatz_k_scripts/collatz_generate_run_report.py
@@ -1124,6 +1124,12 @@ def main() -> None:
         default="",
         help="For profile c3_local_descent: path to deterministic artefacts directory (e.g. docs/artefacts/collatz/c3_local_descent)",
     )
+    ap.add_argument(
+        "--c3-palier",
+        type=int,
+        default=13,
+        help="For profile c3_local_descent: palier m (default 13). For m!=13, expects suffixed filenames.",
+    )
     ap.add_argument(
         "--universal-clauses-artefacts-dir",
         default="",
@@ -1388,7 +1394,8 @@ def main() -> None:
                 "python3 applications/collatz/collatz_k_scripts/collatz_generate_run_report.py "
                 "--profile c3_local_descent --scope c3_local_descent "
                 "--out-dir applications/collatz/out --docs-dir docs "
-                "--c3-artefacts-dir docs/artefacts/collatz/c3_local_descent"
+                "--c3-artefacts-dir docs/artefacts/collatz/c3_local_descent "
+                "--c3-palier 13"
             )
 
         artefacts_dir = (
@@ -1396,8 +1403,13 @@ def main() -> None:
             if args.c3_artefacts_dir.strip()
             else (docs_dir / "artefacts" / "collatz" / "c3_local_descent")
         )
-        verification_json = artefacts_dir / "verification_c3_local_descent.json"
-        verification_md = artefacts_dir / "verification_c3_local_descent.md"
+        if int(args.c3_palier) == 13:
+            verification_json = artefacts_dir / "verification_c3_local_descent.json"
+            verification_md = artefacts_dir / "verification_c3_local_descent.md"
+        else:
+            m = int(args.c3_palier)
+            verification_json = artefacts_dir / f"verification_c3_local_descent_palier2p{m}.json"
+            verification_md = artefacts_dir / f"verification_c3_local_descent_palier2p{m}.md"
         metrics = parse_c3_local_descent_metrics(str(verification_json))
 
         date_str = pick_report_date_from_mtime([verification_json, verification_md])
diff --git a/applications/collatz/collatz_k_scripts/collatz_iterate_palier_protocol.py b/applications/collatz/collatz_k_scripts/collatz_iterate_palier_protocol.py
new file mode 100644
index 0000000..349da6c
--- /dev/null
+++ b/applications/collatz/collatz_k_scripts/collatz_iterate_palier_protocol.py
@@ -0,0 +1,223 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+collatz_iterate_palier_protocol.py
+
+Deterministic "next palier" protocol generator for the hybrid chain C1→C2→C3.
+
+It does NOT run expensive computations. It inspects existing versioned artefacts
+and writes a checklist (JSON + MD) describing:
+- current certified palier for C3 (from verification JSON)
+- current max C2 completion transition (from verification JSON)
+- availability of local H6 directories at a chosen target palier
+- commands to generate / verify / report the next iteration (2^m → 2^(m+1))
+
+Outputs are intended to be versioned under `docs/artefacts/`.
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+from dataclasses import dataclass
+from pathlib import Path
+
+
+def _read_json(path: Path) -> object:
+    return json.loads(path.read_text(encoding="utf-8", errors="strict"))
+
+
+def _req_int(d: dict[str, object], key: str) -> int:
+    v = d.get(key)
+    if not isinstance(v, int):
+        raise ValueError(f"Expected int for {key}")
+    return v
+
+
+def _write_json(path: Path, obj: object) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(obj, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")
+
+
+def _write_md(path: Path, lines: list[str]) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text("\n".join(lines) + "\n", encoding="utf-8")
+
+
+def _discover_local_h6_state_dirs(root: Path, palier: int) -> list[Path]:
+    return sorted([p for p in root.glob(f"local_E*_palier2p{palier}") if p.is_dir()])
+
+
+@dataclass(frozen=True)
+class ProtocolState:
+    c3_palier: int
+    c2_max_child_palier: int
+    target_palier: int
+    local_h6_states_found: int
+    local_h6_missing_state_ids: list[int]
+
+
+def _load_c3_palier(c3_verification_json: Path) -> int:
+    obj = _read_json(c3_verification_json)
+    if not isinstance(obj, dict):
+        raise ValueError("Invalid C3 verification JSON: expected object")
+    domain = obj.get("domain")
+    if not isinstance(domain, dict):
+        raise ValueError("Invalid C3 verification JSON: missing domain")
+    return _req_int(domain, "palier")
+
+
+def _load_c2_max_child_palier(c2_verification_json: Path) -> int:
+    obj = _read_json(c2_verification_json)
+    if not isinstance(obj, dict):
+        raise ValueError("Invalid C2 verification JSON: expected object")
+    transitions = obj.get("transitions")
+    if not isinstance(transitions, list) or not all(isinstance(x, dict) for x in transitions):
+        raise ValueError("Invalid C2 verification JSON: missing transitions")
+    child_paliers = [_req_int(t, "palier_child") for t in transitions]
+    if not child_paliers:
+        raise ValueError("Invalid C2 verification JSON: empty transitions")
+    return max(child_paliers)
+
+
+def _infer_state_id_from_dirname(dirname: str) -> int:
+    # expected: local_E{sid}_palier2p{m}
+    parts = dirname.split("_")
+    for p in parts:
+        if p.startswith("E") and p[1:].isdigit():
+            return int(p[1:])
+    raise ValueError(f"Cannot infer state id from {dirname}")
+
+
+def run(
+    *,
+    local_h6_root: Path,
+    c2_verification_json: Path,
+    c3_verification_json: Path,
+    output_dir: Path,
+    target_palier: int | None,
+) -> None:
+    c3_palier = _load_c3_palier(c3_verification_json)
+    c2_max_child = _load_c2_max_child_palier(c2_verification_json)
+    tgt = (c3_palier + 1) if target_palier is None else int(target_palier)
+    if tgt < 13:
+        raise ValueError("target_palier must be >= 13")
+
+    found_dirs = _discover_local_h6_state_dirs(local_h6_root, tgt)
+    found_ids = sorted({_infer_state_id_from_dirname(p.name) for p in found_dirs})
+    missing_ids = [sid for sid in range(1, 61) if sid not in found_ids]
+
+    state = ProtocolState(
+        c3_palier=c3_palier,
+        c2_max_child_palier=c2_max_child,
+        target_palier=tgt,
+        local_h6_states_found=len(found_ids),
+        local_h6_missing_state_ids=missing_ids,
+    )
+
+    commands = {
+        "C1_local_H6_generate": (
+            "python3 applications/collatz/collatz_k_scripts/collatz_generate_local_h6_artefacts.py "
+            f"--docs-dir docs --output-root docs/artefacts/collatz --state-ids all "
+            f"--palier-start {tgt} --palier-max {tgt} "
+            "--t-min 9 --t-max 120 --write-index --index-path docs/artefacts/collatz/local_H6_index.md"
+        ),
+        "C3_verify_local_descent": (
+            "python3 applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py "
+            "--local-h6-root docs/artefacts/collatz "
+            "--output-dir docs/artefacts/collatz/c3_local_descent "
+            f"--palier {tgt}"
+        ),
+        "Universal_clauses_extract": (
+            "python3 applications/collatz/collatz_k_scripts/collatz_extract_universal_clauses.py "
+            f"--verification-json docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent_palier2p{tgt}.json "
+            "--output-dir docs/artefacts/collatz/universal_clauses"
+        ),
+        "Universal_clauses_verify": (
+            "python3 applications/collatz/collatz_k_scripts/collatz_verify_universal_clauses.py "
+            f"--verification-json docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent_palier2p{tgt}.json "
+            "--clauses-json docs/artefacts/collatz/universal_clauses/clauses_universelles.json "
+            "--output-dir docs/artefacts/collatz/universal_clauses"
+        ),
+        "C2_verify_projective": (
+            "python3 applications/collatz/collatz_k_scripts/collatz_verify_c2_projective.py "
+            "--repo-root /home/ncantu/code/algo --output-dir docs/artefacts/collatz/c2_projective"
+        ),
+    }
+
+    out_obj = {
+        "inputs": {
+            "local_h6_root": str(local_h6_root),
+            "c2_verification_json": str(c2_verification_json),
+            "c3_verification_json": str(c3_verification_json),
+        },
+        "state": {
+            "c3_palier": state.c3_palier,
+            "c2_max_child_palier": state.c2_max_child_palier,
+            "target_palier": state.target_palier,
+            "local_h6_states_found": state.local_h6_states_found,
+            "local_h6_missing_state_ids": state.local_h6_missing_state_ids,
+        },
+        "commands": commands,
+    }
+
+    output_dir.mkdir(parents=True, exist_ok=True)
+    out_json = output_dir / "iteration_protocol.json"
+    out_md = output_dir / "iteration_protocol.md"
+    _write_json(out_json, out_obj)
+
+    md: list[str] = []
+    md.append("**Auteur** : Équipe 4NK")
+    md.append("")
+    md.append("# Protocole déterministe — itération de palier (C1→C2→C3)")
+    md.append("")
+    md.append("## État courant (artefacts)")
+    md.append("")
+    md.append(f"- C3 palier certifié : 2^{state.c3_palier} (d’après `{c3_verification_json}`)")
+    md.append(f"- C2 transition max auditée : palier enfant 2^{state.c2_max_child_palier} (d’après `{c2_verification_json}`)")
+    md.append("")
+    md.append("## Palier cible")
+    md.append("")
+    md.append(f"- palier cible : 2^{state.target_palier}")
+    md.append(f"- H6 locale présente (états) : {state.local_h6_states_found}/60")
+    if state.local_h6_missing_state_ids:
+        md.append(f"- états manquants : {state.local_h6_missing_state_ids}")
+    md.append("")
+    md.append("## Étapes (commandes reproductibles)")
+    md.append("")
+    for k, cmd in commands.items():
+        md.append(f"- **{k}** :")
+        md.append("")
+        md.append("```bash")
+        md.append(cmd)
+        md.append("```")
+        md.append("")
+    md.append("## Notes")
+    md.append("")
+    md.append("- Pour `C3_verify_local_descent` : si `palier != 13`, les sorties attendues sont suffixées `..._palier2p<m>.{json,md}`.")
+    md.append("- La génération de run reports (sha256 + compteurs) pour des paliers `m != 13` peut nécessiter l’extension du profil `c3_local_descent` du générateur de rapports.")
+    _write_md(out_md, md)
+
+
+def main() -> None:
+    ap = argparse.ArgumentParser(description="Generate a deterministic next-palier protocol for C1→C2→C3")
+    ap.add_argument("--local-h6-root", default="docs/artefacts/collatz", help="Root containing local_E*_palier2p<m>/ dirs")
+    ap.add_argument("--c2-verification-json", default="docs/artefacts/collatz/c2_projective/verification_c2_projective.json")
+    ap.add_argument("--c3-verification-json", default="docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent.json")
+    ap.add_argument("--output-dir", default="docs/artefacts/collatz/iteration_protocol")
+    ap.add_argument("--target-palier", default="", help="Override target palier m (defaults to c3_palier+1)")
+    args = ap.parse_args()
+
+    tgt = int(args.target_palier) if args.target_palier.strip() else None
+    run(
+        local_h6_root=Path(args.local_h6_root).resolve(),
+        c2_verification_json=Path(args.c2_verification_json).resolve(),
+        c3_verification_json=Path(args.c3_verification_json).resolve(),
+        output_dir=Path(args.output_dir).resolve(),
+        target_palier=tgt,
+    )
+
+
+if __name__ == "__main__":
+    main()
+
diff --git a/applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py b/applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py
index 61aa784..d4d91ea 100644
--- a/applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py
+++ b/applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py
@@ -7,7 +7,7 @@ Deterministic verification artefact for the C3 step, starting from the
 instrumented C1 (local H6 cover) and C2 (projective reduction).
 
 Scope of this verifier:
-- domain L := Lift_{12->13}(B12) (represented by the versioned local H6 artefacts)
+- domain L := Lift_{12->m}(B12) (represented by the versioned local H6 artefacts)
 - for each n in L, select a witnessed elimination:
   - D8 branch: verify U^8(n) < n (direct check on the representative n)
   - Fusion branch: verify the row witnesses a fusion to a strictly smaller preimage m < n,
@@ -17,7 +17,7 @@ Scope of this verifier:
   proof for representatives is closed unconditionally at this finite bound.
 
 Inputs:
-- docs/artefacts/collatz/local_E*_palier2p13/** (generated by collatz_generate_local_h6_artefacts.py)
+- docs/artefacts/collatz/local_E*_palier2p<m>/** (generated by collatz_generate_local_h6_artefacts.py)
 
 Outputs:
 - docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent.json
@@ -40,10 +40,10 @@ def _read_json(path: Path) -> object:
     return json.loads(path.read_text(encoding="utf-8", errors="strict"))
 
 
-def _discover_state_dirs(root: Path) -> list[Path]:
-    dirs = sorted([p for p in root.glob("local_E*_palier2p13") if p.is_dir()])
+def _discover_state_dirs(root: Path, palier: int) -> list[Path]:
+    dirs = sorted([p for p in root.glob(f"local_E*_palier2p{palier}") if p.is_dir()])
     if not dirs:
-        raise ValueError(f"No local_E*_palier2p13 directories found under {root}")
+        raise ValueError(f"No local_E*_palier2p{palier} directories found under {root}")
     return dirs
 
 
@@ -79,9 +79,9 @@ def _parse_int_field(row: dict[str, str], key: str, source: Path) -> int:
         raise ValueError(f"Invalid int for {key} in {source}: {raw}") from e
 
 
-def _load_fusion_witnesses(state_dir: Path) -> list[FusionWitness]:
+def _load_fusion_witnesses(state_dir: Path, palier: int) -> list[FusionWitness]:
     candidats_dir = state_dir / "candidats"
-    paths = sorted(candidats_dir.glob("candidats_F9to*_E*_palier2p13.csv"))
+    paths = sorted(candidats_dir.glob(f"candidats_F9to*_E*_palier2p{palier}.csv"))
     if not paths:
         return []
 
@@ -143,7 +143,7 @@ def _pick_best_witness(witnesses: list[FusionWitness]) -> dict[int, FusionWitnes
 
 
 def _infer_state_id(state_dir: Path) -> int:
-    m = re.search(r"local_E(\d+)_palier2p13", state_dir.name)
+    m = re.search(r"local_E(\d+)_palier2p(\d+)", state_dir.name)
     if not m:
         raise ValueError(f"Cannot infer state id from {state_dir}")
     return int(m.group(1))
@@ -153,8 +153,9 @@ def run(
     *,
     artefacts_root: Path,
     output_dir: Path,
+    palier: int,
 ) -> None:
-    state_dirs = _discover_state_dirs(artefacts_root)
+    state_dirs = _discover_state_dirs(artefacts_root, palier)
 
     # Domain L as union of per-state lifted noyaux
     L: set[int] = set()
@@ -163,7 +164,7 @@ def run(
 
     for sd in state_dirs:
         sid = _infer_state_id(sd)
-        lift_candidates = sorted((sd / "noyaux").glob(f"noyau_Lift_E{sid}_palier2p13.json"))
+        lift_candidates = sorted((sd / "noyaux").glob(f"noyau_Lift_E{sid}_palier2p{palier}.json"))
         if len(lift_candidates) != 1:
             raise ValueError(f"Expected exactly one lift noyau for {sd}, got {len(lift_candidates)}")
         lift_obj = _read_json(lift_candidates[0])
@@ -174,11 +175,11 @@ def run(
             raise ValueError(f"Invalid lift noyau list: {lift_candidates[0]}")
         L |= set(lift_list)
 
-        cert_d8 = sd / "certificats" / f"certificat_D8_E{sid}_palier2p13.json"
+        cert_d8 = sd / "certificats" / f"certificat_D8_E{sid}_palier2p{palier}.json"
         if cert_d8.exists():
             d8_covered |= _load_covered_from_cert(cert_d8)
 
-        fusion_witnesses_all.extend(_load_fusion_witnesses(sd))
+        fusion_witnesses_all.extend(_load_fusion_witnesses(sd, palier))
 
     if not L:
         raise ValueError("Empty domain L")
@@ -200,7 +201,7 @@ def run(
     d8_exact_base_cases = 0
     d8_exact_descent_witnesses = 0
 
-    shift = 1 << (13 - 1)
+    shift = 1 << (palier - 1)
     d8_exact_set: set[int] = set()
     d8_brother_set: set[int] = set()
     for n in d8_nodes:
@@ -330,7 +331,7 @@ def run(
             "states": len(state_dirs),
         },
         "domain": {
-            "palier": 13,
+            "palier": palier,
             "lifted_domain_size": len(L),
             "min_n": min(L),
             "max_n": max_n,
@@ -353,8 +354,12 @@ def run(
     }
 
     output_dir.mkdir(parents=True, exist_ok=True)
-    out_json = output_dir / "verification_c3_local_descent.json"
-    out_md = output_dir / "verification_c3_local_descent.md"
+    if palier == 13:
+        out_json = output_dir / "verification_c3_local_descent.json"
+        out_md = output_dir / "verification_c3_local_descent.md"
+    else:
+        out_json = output_dir / f"verification_c3_local_descent_palier2p{palier}.json"
+        out_md = output_dir / f"verification_c3_local_descent_palier2p{palier}.md"
     out_json.write_text(json.dumps(summary, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")
 
     lines: list[str] = []
@@ -368,8 +373,8 @@ def run(
     lines.append("")
     lines.append("## Domaine")
     lines.append("")
-    lines.append(f"- palier : 2^13")
-    lines.append(f"- |L| (Lift(B12) à 2^13) : {len(L)}")
+    lines.append(f"- palier : 2^{palier}")
+    lines.append(f"- |L| (Lift(B12) à 2^{palier}) : {len(L)}")
     lines.append(f"- min(L) : {min(L)}, max(L) : {max_n}")
     lines.append("")
     lines.append("## Élimination (témoins)")
@@ -398,21 +403,23 @@ def run(
 
 
 def main() -> None:
-    ap = argparse.ArgumentParser(description="Deterministic C3 verification from local H6 artefacts (palier 2^13)")
+    ap = argparse.ArgumentParser(description="Deterministic C3 verification from local H6 artefacts (palier 2^m)")
     ap.add_argument(
         "--local-h6-root",
         default="docs/artefacts/collatz",
-        help="Root directory containing local_E*_palier2p13 directories",
+        help="Root directory containing local_E*_palier2p<m> directories",
     )
     ap.add_argument(
         "--output-dir",
         default="docs/artefacts/collatz/c3_local_descent",
         help="Output directory for deterministic artefacts (JSON + MD)",
     )
+    ap.add_argument("--palier", type=int, default=13, help="Target palier m for Lift_{12->m}(B12)")
     args = ap.parse_args()
     run(
         artefacts_root=Path(args.local_h6_root),
         output_dir=Path(args.output_dir),
+        palier=int(args.palier),
     )
 
 
diff --git a/applications/collatz/démonstration collatz.md b/applications/collatz/démonstration collatz.md
index 19768a2..6fdc093 100644
--- a/applications/collatz/démonstration collatz.md	
+++ b/applications/collatz/démonstration collatz.md	
@@ -157,3 +157,13 @@ Artefacts déterministes :
 - vérification : `applications/collatz/collatz_k_scripts/collatz_verify_universal_clauses.py`
 - sorties versionnées : `docs/artefacts/collatz/universal_clauses/{clauses_universelles,verification_universal_clauses}.{json,md}`
 - rapport d’exécution : `docs/collatz_run_report_2026-03-09_universal_clauses.md`
+
+6.6. Protocole déterministe d’itération de palier (au-delà de \(2^{13}\))
+
+Pour organiser l’itération \(2^m\to 2^{m+1}\) (C1→C2→C3) à partir des artefacts versionnés, un protocole déterministe produit un état courant (paliers certifiés, transitions C2 disponibles) et une checklist de commandes reproductibles pour un palier cible.
+
+- script : `applications/collatz/collatz_k_scripts/collatz_iterate_palier_protocol.py`
+- sorties : `docs/artefacts/collatz/iteration_protocol/{iteration_protocol.json,iteration_protocol.md}`
+
+Le vérificateur C3 est paramétrable en palier :
+- `applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py --palier m`
diff --git a/docs/artefacts/collatz/iteration_protocol/iteration_protocol.json b/docs/artefacts/collatz/iteration_protocol/iteration_protocol.json
new file mode 100644
index 0000000..891dd84
--- /dev/null
+++ b/docs/artefacts/collatz/iteration_protocol/iteration_protocol.json
@@ -0,0 +1,81 @@
+{
+  "inputs": {
+    "local_h6_root": "/home/ncantu/code/algo/docs/artefacts/collatz",
+    "c2_verification_json": "/home/ncantu/code/algo/docs/artefacts/collatz/c2_projective/verification_c2_projective.json",
+    "c3_verification_json": "/home/ncantu/code/algo/docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent.json"
+  },
+  "state": {
+    "c3_palier": 13,
+    "c2_max_child_palier": 17,
+    "target_palier": 14,
+    "local_h6_states_found": 1,
+    "local_h6_missing_state_ids": [
+      1,
+      2,
+      3,
+      5,
+      6,
+      7,
+      8,
+      9,
+      10,
+      11,
+      12,
+      13,
+      14,
+      15,
+      16,
+      17,
+      18,
+      19,
+      20,
+      21,
+      22,
+      23,
+      24,
+      25,
+      26,
+      27,
+      28,
+      29,
+      30,
+      31,
+      32,
+      33,
+      34,
+      35,
+      36,
+      37,
+      38,
+      39,
+      40,
+      41,
+      42,
+      43,
+      44,
+      45,
+      46,
+      47,
+      48,
+      49,
+      50,
+      51,
+      52,
+      53,
+      54,
+      55,
+      56,
+      57,
+      58,
+      59,
+      60
+    ]
+  },
+  "commands": {
+    "C1_local_H6_generate": "python3 applications/collatz/collatz_k_scripts/collatz_generate_local_h6_artefacts.py --docs-dir docs --output-root docs/artefacts/collatz --state-ids all --palier-start 14 --palier-max 14 --t-min 9 --t-max 120 --write-index --index-path docs/artefacts/collatz/local_H6_index.md",
+    "C3_verify_local_descent": "python3 applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py --local-h6-root docs/artefacts/collatz --output-dir docs/artefacts/collatz/c3_local_descent --palier 14",
+    "Universal_clauses_extract": "python3 applications/collatz/collatz_k_scripts/collatz_extract_universal_clauses.py --verification-json docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent_palier2p14.json --output-dir docs/artefacts/collatz/universal_clauses",
+    "Universal_clauses_verify": "python3 applications/collatz/collatz_k_scripts/collatz_verify_universal_clauses.py --verification-json docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent_palier2p14.json --clauses-json docs/artefacts/collatz/universal_clauses/clauses_universelles.json --output-dir docs/artefacts/collatz/universal_clauses",
+    "C2_verify_projective": "python3 applications/collatz/collatz_k_scripts/collatz_verify_c2_projective.py --repo-root /home/ncantu/code/algo --output-dir docs/artefacts/collatz/c2_projective"
+  }
+}
diff --git a/docs/artefacts/collatz/iteration_protocol/iteration_protocol.md b/docs/artefacts/collatz/iteration_protocol/iteration_protocol.md
new file mode 100644
index 0000000..86e35ff
--- /dev/null
+++ b/docs/artefacts/collatz/iteration_protocol/iteration_protocol.md
@@ -0,0 +1,51 @@
+**Auteur** : Équipe 4NK
+
+# Protocole déterministe — itération de palier (C1→C2→C3)
+
+## État courant (artefacts)
+
+- C3 palier certifié : 2^13 (d’après `/home/ncantu/code/algo/docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent.json`)
+- C2 transition max auditée : palier enfant 2^17 (d’après `/home/ncantu/code/algo/docs/artefacts/collatz/c2_projective/verification_c2_projective.json`)
+
+## Palier cible
+
+- palier cible : 2^14
+- H6 locale présente (états) : 1/60
+- états manquants : [1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60]
+
+## Étapes (commandes reproductibles)
+
+- **C1_local_H6_generate** :
+
+```bash
+python3 applications/collatz/collatz_k_scripts/collatz_generate_local_h6_artefacts.py --docs-dir docs --output-root docs/artefacts/collatz --state-ids all --palier-start 14 --palier-max 14 --t-min 9 --t-max 120 --write-index --index-path docs/artefacts/collatz/local_H6_index.md
+```
+
+- **C3_verify_local_descent** :
+
+```bash
+python3 applications/collatz/collatz_k_scripts/collatz_verify_c3_local_descent.py --local-h6-root docs/artefacts/collatz --output-dir docs/artefacts/collatz/c3_local_descent --palier 14
+```
+
+- **Universal_clauses_extract** :
+
+```bash
+python3 applications/collatz/collatz_k_scripts/collatz_extract_universal_clauses.py --verification-json docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent_palier2p14.json --output-dir docs/artefacts/collatz/universal_clauses
+```
+
+- **Universal_clauses_verify** :
+
+```bash
+python3 applications/collatz/collatz_k_scripts/collatz_verify_universal_clauses.py --verification-json docs/artefacts/collatz/c3_local_descent/verification_c3_local_descent_palier2p14.json --clauses-json docs/artefacts/collatz/universal_clauses/clauses_universelles.json --output-dir docs/artefacts/collatz/universal_clauses
+```
+
+- **C2_verify_projective** :
+
+```bash
+python3 applications/collatz/collatz_k_scripts/collatz_verify_c2_projective.py --repo-root /home/ncantu/code/algo --output-dir docs/artefacts/collatz/c2_projective
+```
+
+## Notes
+
+- Pour `C3_verify_local_descent` : si `palier != 13`, les sorties attendues sont suffixées `..._palier2p<m>.{json,md}`.
+- La génération de run reports (sha256 + compteurs) pour des paliers `m != 13` peut nécessiter l’extension du profil `c3_local_descent` du générateur de rapports.
diff --git a/docs/collatz_run_report_format.md b/docs/collatz_run_report_format.md
index 72baef9..5a75eb5 100644
--- a/docs/collatz_run_report_format.md
+++ b/docs/collatz_run_report_format.md
@@ -112,6 +112,7 @@ python3 applications/collatz/collatz_k_scripts/collatz_generate_run_report.py \
   --profile c3_local_descent \
   --scope c3_local_descent \
   --c3-artefacts-dir docs/artefacts/collatz/c3_local_descent \
+  --c3-palier 13 \
   --out-dir applications/collatz/out \
   --docs-dir docs
 ```