refactor(validations): split lib/validations.ts into a barrel'd folder (slice 1)

1141-line lib/validations.ts → lib/validations/<feature>.ts + primitives.ts +
an index.ts barrel. '@/lib/validations' now resolves to the barrel, so all 40
importers are untouched. Every one of the 143 exports is preserved verbatim
(verified by symbol-diff); schemas moved unchanged. tsc 0, 635 tests green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/validations/knowledge-base.ts

@@ -0,0 +1,26 @@
+import { z } from 'zod'
+import { flexibleDateTime } from './primitives'
+
+export const createKbEntrySchema = z.object({
+  title: z.string().min(1, 'Title is required').max(200),
+  content: z.string().min(1, 'Content is required').max(50000),
+  area: z.string().max(100).optional().nullable(),
+  visibility: z.enum(['all_members', 'board', 'admin_only']).default('all_members'),
+  is_pinned: z.boolean().default(false),
+  tags: z.array(z.string().max(50)).max(20).optional(),
+  icon: z.string().max(10).optional().nullable(),
+})
+
+export const updateKbEntrySchema = createKbEntrySchema.partial().extend({
+  entryId: z.string().uuid('Invalid entry ID'),
+})
+
+// ─── Knowledge base meeting minutes ─────────────────────────────────────────
+
+export const meetingMinutesSchema = z.object({
+  entryId: z.string().uuid('Invalid entry ID'),
+  is_meeting_minutes: z.boolean().default(true),
+  meeting_date: flexibleDateTime().optional(),
+})
+
+export type CreateKbEntryInput = z.infer<typeof createKbEntrySchema>