diff --git a/archivist/config.jsonc b/archivist/config.jsonc
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+{
+  // Example configuration for the Archivist pipeline.
+  // Keys in English; extracted values and rendered file names are in
+  // French, as they appear in the source documents.
+
+  // ==========================================================================
+  // fields: declaration of every field handled by the rules.
+  // A missing mandatory field at the end of the pipeline marks the document
+  // invalid and routes it to pending/ for human review.
+  // "template" is a regular field: rules select the naming template with it.
+  // ==========================================================================
+  "fields": [
+    { "name": "emittingCompany", "type": "string", "mandatory": true  },
+    { "name": "documentType",    "type": "string", "mandatory": true  },
+    { "name": "date",            "type": "string", "mandatory": true  },
+    { "name": "template",        "type": "string", "mandatory": false },
+    { "name": "bankAccount",     "type": "string", "mandatory": false },
+    { "name": "address",         "type": "string", "mandatory": false },
+    { "name": "reference",       "type": "string", "mandatory": false }
+  ],
+
+  // ==========================================================================
+  // rules: an ordered tree evaluated against the first-page text
+  // (firstPageText) and the fields already set or deleted by earlier rules.
+  //
+  // Each rule contains four keys:
+  //   when  (required): expr-lang expression; the rest of the rule runs only
+  //                     if it evaluates to true
+  //   set   : list of assignments
+  //             { "field": "x", "value": <fixed value> }  constant
+  //             { "field": "x", "eval": "<expression>" }  evaluated in the
+  //                                                        same context
+  //   delete: list of field names to unset
+  //   rules : child rules, evaluated in order only if the parent "when"
+  //           matched; nesting is recursive
+  //
+  // Built-in helper: firstMatch(regex) returns the first match of the regex
+  // in the first-page text (first capture group when present).
+  // ==========================================================================
+  "rules": [
+    // --- Generic extraction, runs for every document -------------------------
+    // Emission date, e.g. "Paris, le 15/01/2026" -> "15/01/2026"
+    {
+      "when": "true",
+      "set": [
+        { "field": "date", "eval": "firstMatch("[0-9]{2}/[0-9]{2}/[0-9]{4}")" }
+      ]
+    },
+
+    // --- Bank statements (relevés de compte) ----------------------------------
+    {
+      "when": "firstPageText contains "Relevé de compte"",
+      "set": [
+        { "field": "documentType", "value": "Relevé de compte" },
+        { "field": "template",     "value": "bank_statement" }
+      ],
+      "rules": [
+        // Issuing bank
+        {
+          "when": "firstPageText contains "BRED"",
+          "set": [ { "field": "emittingCompany", "value": "BRED" } ]
+        },
+        {
+          "when": "firstPageText contains "Fortunéo"",
+          "set": [ { "field": "emittingCompany", "value": "Fortunéo" } ]
+        },
+        {
+          "when": "firstPageText contains "Crédit Mutuel"",
+          "set": [ { "field": "emittingCompany", "value": "Crédit Mutuel" } ]
+        },
+        // Personal accounts, matched on the account number printed on page 1
+        {
+          "when": "firstPageText contains "12345678901"",
+          "set": [ { "field": "bankAccount", "value": "Compte Thomas" } ]
+        },
+        {
+          "when": "firstPageText contains "98765432109"",
+          "set": [ { "field": "bankAccount", "value": "Compte joint" } ]
+        }
+      ]
+    },
+
+    // --- Taxe d'habitation, one child rule per address ------------------------
+    {
+      "when": "firstPageText contains "Taxe d'habitation"",
+      "set": [
+        { "field": "documentType",    "value": "Taxe d'habitation" },
+        { "field": "emittingCompany", "value": "DGFiP" },
+        { "field": "template",        "value": "tax_notice_housing" }
+      ],
+      "rules": [
+        {
+          "when": "firstPageText contains "12 rue des Lilas"",
+          "set": [ { "field": "address", "value": "12 rue des Lilas, Paris" } ]
+        },
+        {
+          "when": "firstPageText contains "34 avenue Jean Jaurès"",
+          "set": [ { "field": "address", "value": "34 avenue Jean Jaurès, Bordeaux" } ]
+        }
+      ]
+    },
+
+    // --- Avis d'impôt sur le revenu --------------------------------------------
+    {
+      "when": "firstPageText contains "Impôt sur le revenu" && firstPageText contains "avis d'imposition"",
+      "set": [
+        { "field": "documentType",    "value": "Avis d'impôt sur le revenu" },
+        { "field": "emittingCompany", "value": "DGFiP" },
+        { "field": "template",        "value": "tax_notice_income" }
+      ]
+    },
+
+    // --- Generic invoices (e-commerce and others) -----------------------------
+    {
+      "when": "firstPageText contains "Facture" && firstPageText contains "TVA"",
+      "set": [
+        { "field": "documentType", "value": "Facture" },
+        { "field": "template",     "value": "invoice" },
+        // Invoice number, e.g. "Facture n° F-2026-0123" -> "F-2026-0123"
+        { "field": "reference",    "eval": "firstMatch("[Ff]acture n° ?([A-Za-z0-9-]+)")" }
+      ],
+      // Fields that do not apply to invoices, in case an earlier rule
+      // set them
+      "delete": [ "bankAccount", "address" ],
+      "rules": [
+        {
+          "when": "firstPageText contains "Amazon"",
+          "set": [ { "field": "emittingCompany", "value": "Amazon" } ]
+        },
+        {
+          "when": "firstPageText contains "LDLC"",
+          "set": [ { "field": "emittingCompany", "value": "LDLC" } ]
+        },
+        {
+          "when": "firstPageText contains "Cdiscount"",
+          "set": [ { "field": "emittingCompany", "value": "Cdiscount" } ]
+        }
+      ]
+    }
+  ],
+
+  // ==========================================================================
+  // templates: named naming templates, selected by the "template" field.
+  // The rendered template is the full object path under files/.
+  // {date} is rendered as yyyy-mm-dd when set (normalized; "/" is not usable
+  // in a S3 key). A field that no rule has set renders as an empty string.
+  // If no rule sets "template", the "default" template is used.
+  // ==========================================================================
+  "templates": {
+    "bank_statement":     "{emittingCompany}/{date}_{documentType}_{bankAccount}.pdf",
+    "tax_notice_housing": "Impots/{date}_{documentType}_{address}.pdf",
+    "tax_notice_income":  "Impots/{date}_{documentType}.pdf",
+    "invoice":            "Factures/{date}_{emittingCompany}_{reference}.pdf",
+    "default":            "Divers/{documentType}.pdf"
+  }
+}