feat: add sdk save-changes command for applying sdk customizations

.ai/instructions.md

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+# APIMatic CLI — Project Instructions
+
+This file provides guidance when working with code in this repository.
+
+## Project Overview
+
+APIMatic CLI (`@apimatic/cli`) — the official CLI for APIMatic, built on oclif v4 with TypeScript ESM. It provides commands for API spec validation/transformation, SDK generation, and documentation portal management.
+
+## Common Commands
+
+```bash
+# Build
+npm run build          # tsc -b → outputs to lib/
+
+# Lint
+npm run lint           # ESLint on src/**/*.{js,ts}
+npm run lint:fix       # ESLint with --fix --quiet
+
+# Format
+npm run format         # Prettier write on src/**/*.{js,ts}
+
+# Test (all)
+npm test               # tsx + mocha, runs test/**/*.test.ts
+
+# Test (single file)
+npx tsx node_modules/mocha/bin/_mocha "test/actions/portal/serve.test.ts" --timeout 99999
+
+# Run CLI locally
+node bin/run.js <command>
+```
+
+## Architecture — 5-Layer Stack
+
+```
+Command → Action → Application → Prompts / Infrastructure → Types
+```
+
+1. **Commands** (`src/commands/`) — oclif `Command` subclasses. Parse flags, build `CommandMetadata`, call `intro()` → `action.execute()` → `outro(result)`. No business logic.
+2. **Actions** (`src/actions/`) — One per command. Orchestrate use-case: validate inputs via Context objects, coordinate services, return `ActionResult<T>`. Never throw to Command.
+3. **Application** (`src/application/`) — Complex reusable domain algorithms (e.g., TOC generators, recipe generators). Pure transformations: data in → data out. No prompts, no API calls.
+4. **Prompts** (`src/prompts/`) — All terminal UI via `@clack/prompts`. One class per command mirroring `actions/`. Uses `withSpinner` for async operations. No business logic.
+5. **Infrastructure** (`src/infrastructure/`) — I/O adapters: `FileService`, `ZipService`, `NetworkService`, API services in `services/`. All return `Result<T, ServiceError>` (neverthrow).
+
+Supporting: **Types** (`src/types/`) for value objects, context objects, and domain events, **client-utils** for auth credential management, **utils** for pure string helpers, **config** for shared Axios instance, **hooks** (`src/hooks/`) for oclif lifecycle hooks (e.g., command-not-found suggestions), **env-info** (`src/infrastructure/env-info.ts`) singleton for CLI version, user-agent string, and base URL resolution.
+
+## Critical Code Conventions
+
+- **ESM imports with `.js` extension** — even for `.ts` source files: `import { Foo } from "../../types/file/directoryPath.js"`
+- **No raw string paths** — use `DirectoryPath`, `FilePath`, `FileName`, `UrlPath` value objects from `src/types/file/`
+- **No `console.log`** — all output through `@clack/prompts` via Prompts classes only
+- **Error handling**: Services return `Result<T, ServiceError>` (neverthrow); Actions return `ActionResult<T>` (success/failed/cancelled). No uncaught throws above infrastructure.
+- **Prompts delegation** — Actions never call `log.*` directly; every message goes through `this.prompts.*`
+- **Temp directories** — always use `withDirPath()` wrapper, never `tmp-promise` directly
+- **`authKey` typed as `string | null = null`**, not `undefined`
+- **Exit via `outro(result)`** — sets `process.exitCode`; never call `process.exit()` directly
+- **`ActionResult` variants** — `success()`, `failed()`, `cancelled()`, `stopped()` (for long-running server commands); exit codes 0 / 1 / 130 respectively
+- **Constructor pattern**: `private readonly` properties, `public readonly execute = async (...) => { ... }`
+- **`static cmdTxt`** on every Command using `format.cmd(...)` for example rendering
+- **Commands use `export default class`** — oclif requires default export; actions, prompts, and services use named exports (`export class`)
+- **Static fields use `readonly`** — `static readonly summary`, `static readonly description`, `static readonly cmdTxt` on every Command
+- **Topic separator is space** — `apimatic portal generate`, not `apimatic portal:generate`
+- **Telemetry** — After `outro(result)`, commands optionally track failures via `result.mapAll(() => {}, async () => { await new TelemetryService(configDir).trackEvent(new SomeFailedEvent(...), shell) }, () => {})`. Event classes extend `DomainEvent` (`src/types/events/`). Only the failure callback is populated; success/cancel are no-ops.
+
+## Commit Conventions
+
+Uses [Conventional Commits](https://www.conventionalcommits.org/) enforced by commitlint + husky. Pre-commit runs lint-staged (ESLint + Prettier).
+
+**Do not commit or push automatically.** Always wait for explicit instruction from the user before running `git commit` or `git push`.
+
+## Testing
+
+- **Framework**: mocha + chai (expect style) + sinon + nock + mock-fs
+- **Test location**: mirrors source — `test/commands/`, `test/actions/`, `test/application/`
+- **HTTP mocking**: nock for API calls
+- **Run via tsx** (not ts-node) for ESM compatibility
+
+## Skills
+
+Reference these files for scaffolding new code:
+
+- `.ai/skills/command.md` — Command + Action + Prompts conventions; scaffolding templates and checklists
+- `.ai/skills/action.md` — Action class conventions; standard / minimal / delegation variants
+- `.ai/skills/context.md` — Context object conventions; output / input / temp / pure variants
+- `.ai/skills/prompt.md` — Prompts class conventions; simple / standard / delegation / wizard variants
+- `.ai/skills/service.md` — Infrastructure Service conventions; SDK controller / axios-auth / axios-stateless variants
+- `.ai/skills/value-object.md` — Value object (rich class) conventions; encapsulation, boundary unwrapping, composition rules