feat: add procedural flows with intake forms, navigation, and seed templates

Adds a new "procedural" tree type for linear step-by-step project workflows
(domain controller setup, M365 onboarding, VPN config, etc). Includes intake
form builder, two-panel step navigation, variable resolution, procedural
exports, 3 seed templates, and UI rename from "Trees" to "Flows".

Also archives 19 implemented plan docs and creates deferred features backlog.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/types/session.ts

@@ -64,6 +64,7 @@ export interface SessionCreate {
   tree_id: string
   ticket_number?: string
   client_name?: string
+  session_variables?: Record<string, string>
 }
 
 export interface SessionUpdate {

frontend/src/types/tree.ts

@@ -56,6 +56,77 @@ export interface TreeStructure {
   children?: TreeStructure[]
 }
 
+// --- Procedural Flow Types ---
+
+export type TreeType = 'troubleshooting' | 'procedural'
+
+export type IntakeFieldType =
+  | 'text' | 'textarea' | 'number' | 'ip_address' | 'email'
+  | 'select' | 'multi_select' | 'checkbox' | 'password'
+
+export type StepContentType = 'action' | 'informational' | 'verification' | 'warning'
+
+export interface IntakeFieldValidation {
+  min_length?: number
+  max_length?: number
+  pattern?: string
+  pattern_message?: string
+  format?: 'ipv4' | 'email'
+  min_value?: number
+  max_value?: number
+  min_selections?: number
+  max_selections?: number
+}
+
+export interface IntakeFormField {
+  variable_name: string
+  label: string
+  field_type: IntakeFieldType
+  required: boolean
+  options?: string[]
+  placeholder?: string
+  help_text?: string
+  default_value?: string
+  group_name?: string
+  display_order: number
+  validation?: IntakeFieldValidation
+}
+
+export interface CommandBlock {
+  language?: string
+  code: string
+  label?: string
+}
+
+export interface StepVerification {
+  type: 'checkbox' | 'text_input'
+  prompt: string
+}
+
+export interface ProceduralStep {
+  id: string
+  type: 'procedure_step' | 'procedure_end'
+  title: string
+  description?: string
+  content_type?: StepContentType
+  estimated_minutes?: number
+  warning_text?: string
+  // Verification — supports both flat fields and nested object
+  verification_prompt?: string
+  verification_type?: 'checkbox' | 'text_input'
+  verification?: StepVerification
+  // Commands — supports both string and array of command blocks
+  commands?: string | CommandBlock[]
+  expected_outcome?: string
+  notes_enabled?: boolean
+  section_header?: string
+  reference_url?: string
+}
+
+export interface ProceduralTreeStructure {
+  steps: ProceduralStep[]
+}
+
 // API response types
 export type TreeStatus = 'draft' | 'published'
 
@@ -63,11 +134,14 @@ export interface Tree {
   id: string
   name: string
   description: string | null
+  tree_type: TreeType
   category: string | null
   category_id: string | null
   category_info: CategoryInfo | null
   tags: string[]
-  tree_structure: TreeStructure
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  tree_structure: TreeStructure & Record<string, any>
+  intake_form: IntakeFormField[] | null
   author_id: string | null
   account_id: string | null
   is_active: boolean
@@ -84,6 +158,7 @@ export interface TreeListItem {
   id: string
   name: string
   description: string | null
+  tree_type: TreeType
   category: string | null
   category_id: string | null
   category_info: CategoryInfo | null
@@ -103,10 +178,13 @@ export interface TreeListItem {
 export interface TreeCreate {
   name: string
   description?: string
+  tree_type?: TreeType
   category?: string
   category_id?: string | null
   tags?: string[]
-  tree_structure: TreeStructure
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  tree_structure: Record<string, any>
+  intake_form?: IntakeFormField[]
   is_public?: boolean
   is_default?: boolean
   status?: TreeStatus
@@ -115,10 +193,13 @@ export interface TreeCreate {
 export interface TreeUpdate {
   name?: string
   description?: string
+  tree_type?: TreeType
   category?: string
   category_id?: string | null
   tags?: string[]
-  tree_structure?: TreeStructure
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  tree_structure?: Record<string, any>
+  intake_form?: IntakeFormField[]
   is_active?: boolean
   is_public?: boolean
   status?: TreeStatus
@@ -126,6 +207,7 @@ export interface TreeUpdate {
 
 // Filter params for tree listing
 export interface TreeFilters {
+  tree_type?: TreeType
   category?: string
   category_id?: string
   tags?: string