feat: add max-lines guard with self-cleaning exemptions (RD-02)

The dashboard refactor proved a page can be 42 lines. This rule holds
the rest of the app to that budget, before the split work in RD-20
through RD-26 begins.

Add max-lines at 250 (skipBlankLines, skipComments), scoped to
{apps,libs}/**/*.{page,component,section,step}.ts. The glob includes
section and step, the file kinds the dashboard refactor invented, so
new files from this arc do not escape the guard.

Add linterOptions.reportUnusedDisableDirectives: 'error' repo-wide.
ESLint 9 only warns on an unused disable by default, so a stale
exemption would not fail the build. At 'error', every later file
split must delete its own exemption or the build goes red.

Add a dated /* eslint-disable max-lines */ header to each of the
seven files that exceed the budget today, each with a reason and the
ticket that removes it. letter-canvas keeps its disable after RD-26,
because most of its lines are CSS and the rest is one letter.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/ssp/src/app/brief/ui/letter-canvas/letter-canvas.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines */ // 77 lines are CSS, the rest is one letter — RD-26 rewrites this reason, keeps the disable
 import {
   Component,
   DestroyRef,

apps/ssp/src/app/brief/ui/org-template-editor/org-template-editor.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines */ // sample letter + labels + editor in one file — removed by RD-25
 import { Component, computed, input, output } from '@angular/core';
 import { DatePipe } from '@angular/common';
 import { HeadingComponent } from '@shared/ui/heading/heading.component';

apps/ssp/src/app/herregistratie/ui/herregistratie-wizard/herregistratie-wizard.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines */ // single-step wizard shell — removed by RD-20
 import { Component, computed, inject, input } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { FormFieldComponent } from '@shared/ui/form-field/form-field.component';

apps/ssp/src/app/herregistratie/ui/intake-wizard/intake-wizard.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines */ // one wizard shell for the intake steps — removed by RD-22
 import { Component, computed, effect, inject, input, untracked } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { FormFieldComponent } from '@shared/ui/form-field/form-field.component';

apps/ssp/src/app/registratie/ui/registratie-wizard/registratie-wizard.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines */ // one wizard shell for 3 steps + upload — removed by RD-23
 import { Component, computed, effect, inject, input, untracked } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { FormFieldComponent } from '@shared/ui/form-field/form-field.component';

apps/ssp/src/app/showcase/concepts.page.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines */ // teaching page covering every concept — removed by RD-24
 import { Component, computed, signal } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import type { Resource } from '@angular/core';