feat(i18n): translate models.json chapter to Brazilian Portuguese

Fill the `pt` mirror fields on the /models/ chapter so the bilingual
contract stops being silently English-only. 24 fields: hero eyebrow,
title, lede, three effort-tier cards, and two sections (the routing
rule panel and the sequence steps).

The chapter reuses the same six surface primitives as landing.json
and summary.json, with one new shape: the routing-rule panel
(panelLabel + panelCode) on the first section, and a three-step
sequence (steps[].label / steps[].copy) on the second. The English
panel code mixes prose and prose-like tokens (→, ×, ·); the
Portuguese preserves all of those.

Translation register follows the conventions established by
src/content/commonSkills/*.json, the full-guide PT snapshot, and the
two prior commits on this branch (1baa314 landing.json, fd031b0
summary.json): imperative voice, second-person `você`, sentence-case
prose, all-caps labels, and English kept for product nouns (skill,
worktree, brief, gate, pipeline, recall, prompt, enforcement, runs,
model-tier names). Numeric and tier labels (LOW / BAIXO, MEDIUM /
MÉDIO, HIGH / ALTO) translate as established by the efforts
collection. `Ambiguidade` for "ambiguity" follows phases/plan.json's
established usage; `execução delimitada` for "bounded execution"
mirrors routes/build.json. The English metaphor "spend judgment /
compounds" is rendered as `Invista julgamento onde ele compensa`,
which carries the same meaning in Portuguese; the literal calque
`compostos` would be opaque.

Verified by .agents/scripts/audit-translations.mjs: models.json
contribution to the offenders list drops from 24 to 0. Remaining
identical fields live in agents.json (24) and skills.json (16),
which will land in subsequent commits.

src/content/chapters/models.json

@@ -2,57 +2,57 @@
   "id": "models",
   "eyebrow": {
     "en": "Model routing",
-    "pt": "Model routing"
+    "pt": "Roteamento de modelos"
   },
   "title": {
     "en": "Choose the<br><em>engine.</em>",
-    "pt": "Choose the<br><em>engine.</em>"
+    "pt": "Escolha o<br><em>motor.</em>"
   },
   "lede": {
     "en": "A model has a capability ceiling. Effort controls how much room it gets to reason. Route by uncertainty and verification cost.",
-    "pt": "A model has a capability ceiling. Effort controls how much room it gets to reason. Route by uncertainty and verification cost."
+    "pt": "Um modelo tem um teto de capacidade. O esforço controla quanto espaço ele ganha para raciocinar. Roteie por incerteza e custo de verificação."
   },
   "cards": [
     {
       "label": {
         "en": "LOW",
-        "pt": "LOW"
+        "pt": "BAIXO"
       },
       "title": {
         "en": "Bounded rhythm",
-        "pt": "Bounded rhythm"
+        "pt": "Ritmo delimitado"
       },
       "copy": {
         "en": "Lookup, small edits, formatting, and transformations with clear checks.",
-        "pt": "Lookup, small edits, formatting, and transformations with clear checks."
+        "pt": "Consultas, edições pequenas, formatação e transformações com checagens claras."
       }
     },
     {
       "label": {
         "en": "MEDIUM",
-        "pt": "MEDIUM"
+        "pt": "MÉDIO"
       },
       "title": {
         "en": "Default work",
-        "pt": "Default work"
+        "pt": "Trabalho padrão"
       },
       "copy": {
         "en": "Normal implementation where the contract is clear but context matters.",
-        "pt": "Normal implementation where the contract is clear but context matters."
+        "pt": "Implementação normal em que o contrato é claro, mas o contexto importa."
       }
     },
     {
       "label": {
         "en": "HIGH",
-        "pt": "HIGH"
+        "pt": "ALTO"
       },
       "title": {
         "en": "Ambiguity",
-        "pt": "Ambiguity"
+        "pt": "Ambiguidade"
       },
       "copy": {
         "en": "Planning, architecture, security judgment, and hard failures.",
-        "pt": "Planning, architecture, security judgment, and hard failures."
+        "pt": "Planejamento, arquitetura, julgamento de segurança e falhas difíceis."
       }
     }
   ],
@@ -60,59 +60,59 @@
     {
       "eyebrow": {
         "en": "Two knobs",
-        "pt": "Two knobs"
+        "pt": "Dois controles"
       },
       "title": {
         "en": "Capability<br>× effort",
-        "pt": "Capability<br>× effort"
+        "pt": "Capacidade<br>× esforço"
       },
       "panelLabel": {
         "en": "ROUTING RULE",
-        "pt": "ROUTING RULE"
+        "pt": "REGRA DE ROTEAMENTO"
       },
       "panelCode": {
         "en": "strong model + high effort → frame ambiguity\nlight model  + low effort  → bounded execution\nraise one knob at a time   → compare evidence",
-        "pt": "strong model + high effort → frame ambiguity\nlight model  + low effort  → bounded execution\nraise one knob at a time   → compare evidence"
+        "pt": "modelo forte + esforço alto → enquadrar ambiguidade\nmodelo leve + esforço baixo → execução delimitada\nsuba um controle por vez    → compare evidências"
       }
     },
     {
       "eyebrow": {
         "en": "Sequence",
-        "pt": "Sequence"
+        "pt": "Sequência"
       },
       "title": {
         "en": "Spend judgment<br>where it <em>compounds.</em>",
-        "pt": "Spend judgment<br>where it <em>compounds.</em>"
+        "pt": "Invista julgamento<br>onde ele <em>compensa.</em>"
       },
       "steps": [
         {
           "label": {
             "en": "Plan",
-            "pt": "Plan"
+            "pt": "Planejar"
           },
           "copy": {
             "en": "Strong model: scope, risks, acceptance, and worktree split.",
-            "pt": "Strong model: scope, risks, acceptance, and worktree split."
+            "pt": "Modelo forte: escopo, riscos, aceitação e divisão de worktrees."
           }
         },
         {
           "label": {
             "en": "Build",
-            "pt": "Build"
+            "pt": "Construir"
           },
           "copy": {
             "en": "Focused worker: smallest context and lightest model that can pass.",
-            "pt": "Focused worker: smallest context and lightest model that can pass."
+            "pt": "Worker focado: o menor contexto e o modelo mais leve que passa."
           }
         },
         {
           "label": {
             "en": "Review",
-            "pt": "Review"
+            "pt": "Revisar"
           },
           "copy": {
             "en": "Independent pass when missed issues cost more than the call.",
-            "pt": "Independent pass when missed issues cost more than the call."
+            "pt": "Revisão independente quando erros perdidos custam mais que a chamada."
           }
         }
       ]