refactor(quota): move provider quota logic into adapter layer, add unit tests

- Extract all Anthropic credential/API logic into claude-local/src/server/quota.ts
- Extract all OpenAI/WHAM credential/API logic into codex-local/src/server/quota.ts
- Add optional getQuotaWindows() to ServerAdapterModule in adapter-utils
- Rewrite quota-windows.ts as a 29-line thin aggregator with zero provider knowledge
- Wire getQuotaWindows into adapter registry for claude-local and codex-local
- Add 47 unit tests covering toPercent, secondsToWindowLabel, WHAM normalization,
  readClaudeToken, readCodexToken, fetchClaudeQuota, fetchCodexQuota, fetchWithTimeout
- Add 8 unit tests covering parseDateRange validation and byProvider pro-rata math

Adding a third provider now requires only touching that provider's adapter.

packages/adapters/codex-local/src/server/index.ts

@@ -1,6 +1,14 @@
 export { execute, ensureCodexSkillsInjected } from "./execute.js";
 export { testEnvironment } from "./test.js";
 export { parseCodexJsonl, isCodexUnknownSessionError } from "./parse.js";
+export {
+  getQuotaWindows,
+  readCodexToken,
+  fetchCodexQuota,
+  secondsToWindowLabel,
+  fetchWithTimeout,
+  codexHomeDir,
+} from "./quota.js";
 import type { AdapterSessionCodec } from "@paperclipai/adapter-utils";
 
 function readNonEmptyString(value: unknown): string | null {