Added AI skills

.agents/skills/react-hook-form/references/_sections.md

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+# Sections
+
+This file defines all sections, their ordering, impact levels, and descriptions.
+The section ID (in parentheses) is the filename prefix used to group rules.
+
+---
+
+## 1. Form Configuration (formcfg)
+
+**Impact:** CRITICAL
+**Description:** Initial useForm setup determines validation timing, re-render boundaries, and what ends up in the submitted payload. The wrong mode validates on every keystroke; the wrong disabled or shouldUnregister setting silently drops data.
+
+## 2. Field Subscription (sub)
+
+**Impact:** CRITICAL
+**Description:** Where a subscription lives decides how much of the tree re-renders. Reading a value at the form root instead of in the leaf that displays it is the difference between re-rendering the whole form and re-rendering one field.
+
+## 3. Controlled Components (ctrl)
+
+**Impact:** HIGH
+**Description:** Controller and useController isolate re-renders only when they sit in a child component. Wiring their field props to a third-party control also has to match that library's prop names, or the input renders but never writes back.
+
+## 4. Validation Patterns (valid)
+
+**Impact:** HIGH
+**Description:** Where the schema is constructed, how server-side failures re-enter the form, and how error display is paced. Building a schema inside render pays the construction cost on every keystroke.
+
+## 5. State Management (formstate)
+
+**Impact:** MEDIUM-HIGH
+**Description:** formState is a per-property Proxy, so a value you never read during render is a value you never re-render for. Submit lifecycle belongs here too: an async handler that throws without a catch strands isSubmitting forever.
+
+## 6. Field Arrays (array)
+
+**Impact:** MEDIUM-HIGH
+**Description:** Dynamic field management requires stable keys and one owner per field name. Some options — notably disabled — fail silently rather than loudly.
+
+## 7. Integration Patterns (integ)
+
+**Impact:** MEDIUM
+**Description:** Third-party UI library integration (shadcn/Radix, MUI) requires specific wiring, and native inputs need explicit type coercion before values reach a typed schema.