docs: setup files and the client, shared and CI docs describe what is (#6277)

.dockerignore, .gitignore, deploy/initdb, ci-requirements.md,
client/README.md, shared/README.md and two web/scripts test names: dates,
issue/rule/spike ids and the stories behind each exclusion removed.

Corrected:
- client/README.md: the dev lane bundles its own APK; :main no longer
  exists; main bundles the recorded sidecar instead of re-deriving the
  version name. Its smoke-test step wrote a bare "v0.2.0", which the
  server rejects as a sidecar that is not JSON; it now writes the JSON
  shape, which the README documents.
- ci-requirements.md: one workflow, not four; the android lane builds no
  debug APK; main reads the recorded sidecar.
- .gitignore: CI fills client/ on every image build, not tag releases only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/scripts/check-tint-contrast.test.js

@@ -5,7 +5,7 @@ import { findCss, findRawText, findTailwind, scan } from './check-tint-contrast.
 
 const web = resolve(dirname(fileURLToPath(import.meta.url)), '..');
 
-describe('hue-on-own-tint check (#3150)', () => {
+describe('hue-on-own-tint check', () => {
   test('no source paints a hue as text on a tint of itself', () => {
     expect(scan(resolve(web, 'src'), web)).toEqual([]);
   });
@@ -42,7 +42,7 @@ describe('hue-on-own-tint check (#3150)', () => {
       expect(findRawText(`.msg { color: var(--fs-error); }`)[0].fix).toBe('var(--fs-error-fg)');
     });
 
-    test('raw accent text is caught too, including hover: variants (#5318)', () => {
+    test('raw accent text is caught too, including hover: variants', () => {
       expect(findRawText(`<a class="text-sm text-accent hover:underline">`)[0].fix).toBe('text-accent-fg');
       expect(findRawText(`<a class="hover:text-accent">`)).toHaveLength(1);
       expect(findRawText(`.pending { color: var(--fs-accent); }`)[0].fix).toBe('var(--fs-accent-fg)');