docs: add CLI agent guide for SDK sync

AGENTS.md

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+# Linkup CLI Agent Guide
+
+This repository contains the Linkup CLI for the Linkup API.
+
+## Goal
+
+Keep the CLI aligned with the current public, stable Linkup JS SDK while preserving a clean CLI developer experience.
+
+## Working Rules
+
+- Read this file before making changes.
+- Prefer minimal diffs focused on the public JS SDK change being synchronized.
+- Do not expose internal, beta, deprecated, or undocumented SDK behavior unless explicitly requested.
+- Preserve the repo's CLI conventions:
+  - use kebab-case flags in the public CLI surface;
+  - convert to SDK camelCase only at the `linkup-sdk` call boundary;
+  - follow existing commands as the template (including `--json`, `--wait`, `--async`, and stdin / `--file`).
+- Synchronize public `LinkupClient` methods and their request parameters; ignore SDK internals and `linkup-sdk/x402`.
+- Avoid unnecessary breaking changes. If a change would be breaking or ambiguous, stop and explain instead of guessing.
+- If a CLI change requires a newer SDK, bump the `linkup-sdk` dependency in the same change.
+
+## When Updating the CLI
+
+When adding or changing a public CLI capability, update the relevant pieces together:
+- CLI commands,
+- CLI options,
+- CLI output,
+- CLI error handling,
+- CLI tests,
+- CLI README/examples if the user-facing CLI changed.
+
+## Validation
+
+Before opening a PR, run the narrowest relevant checks:
+- `npm run build`
+- `npm run lint`
+- `npm test`
+
+## Non-Goals
+
+- Do not change package version, release config, or publish settings unless the task explicitly asks for it.
+- Do not refactor unrelated code while performing SDK synchronization.
+
+## Sync Decisions
+
+Add durable exceptions here when a proposed sync should not be repeated.
+
+- Do not expose SDK capabilities that are not clearly public and stable.
+- Do not implement a `credits` command unless explicitly requested.
+- Do not implement a `responses` command unless explicitly requested.
+- Do not implement x402 / wallet payment unless explicitly requested.
+- If a capability was intentionally rejected for product/design reasons, do not propose it again until this file is updated.