Rename package from celesto_sdk to celesto

[Copilot]

Simplified package name from celesto_sdk to celesto for cleaner imports.

Changes

• Package structure: Renamed src/celesto_sdk/ → src/celesto/
• Build config: Updated pyproject.toml CLI entry point, version path, and wheel packages
• Imports: Updated all absolute imports to new package name, converted internal imports to relative
• Documentation: Updated README and AGENTS.md examples

Example

Before:

from celesto_sdk.sdk import CelestoSDK

After:

from celesto.sdk import CelestoSDK

Original prompt

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This section details on the original issue you should resolve

<issue_title>rename package from celesto_sdk to celesto</issue_title>
<issue_description>- from celesto_sdk.sdk import CelestoSDK becomes from celesto.sdk import CelestoSDK

• Update all the tests and examples accordingly</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes rename package from celesto_sdk to celesto #1

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