feat(galileo-adk): rebrand to SPLUNK_AO_* env vars and SplunkAO* classes (HYBIM-716)

[adityamehra]

Core package (galileo-adk/src/galileo_adk/):

• Rename GalileoADKCallback -> SplunkAOADKCallback
• Rename GalileoADKObserver -> SplunkAOADKObserver
• Rename GalileoADKPlugin -> SplunkAOADKPlugin
• Rename GALILEO_* env vars -> SPLUNK_AO_* throughout callback.py, decorator.py, observer.py, plugin.py
• Update init.py exports to SplunkAO* names
• Update pyproject.toml: galileo dependency -> splunk-ao

Core SDK (src/splunk_ao/config.py):

• Add ("SPLUNK_AO_API_URL", "GALILEO_API_URL") to _bridge_env_vars() so SPLUNK_AO_API_URL is correctly passed to galileo-core for self-hosted deployments

Documentation (galileo-adk/README.md):

• Replace GalileoADK* class names with SplunkAOADK* in all code examples
• Replace GALILEO_* env vars -> SPLUNK_AO_* in configuration tables
• Update brand mentions (Galileo -> Splunk AO)

Tests:

• Update all class names and env var references in test_callback.py, test_observer.py, test_plugin.py, test_retriever.py

[adityamehra]

Reset the version to 0.1.0

[adityamehra]

Done — __version__ reset to "0.1.0" in __init__.py and pyproject.toml.

[adityamehra]

update directory to from galileo-adk to splunk-ao-adk

[adityamehra]

Done — PyPI package renamed to splunk-ao-adk in pyproject.toml. The Python import module name (galileo_adk) is kept as-is for now to avoid breaking downstream consumers; a follow-up rename of the source directory (galileo_adk/ → splunk_ao_adk/) can be tracked separately if desired.

[adityamehra]

We need to review toml for galileo adk and make sure to update galileo references to splunk-ao where possible. Teset the initial version to 0.1.0 and tags to refer to splunk-ao wherever possible

[adityamehra]

Done — full pyproject.toml cleanup applied:

• name → splunk-ao-adk, version → 0.1.0
• Description, authors (Splunk Inc.), repository URL → splunk/splunk-ao-python
• galileo dependency → splunk-ao>=2.0.0,<3.0.0
• tool.uv.sources key → splunk-ao
• tag_format / commit_message → splunk-ao-adk-v{version}
• Dev dep: galileo-core[testing] → splunk-ao[otel]
• known-first-party → splunk_ao
• README badges and pip install → splunk-ao-adk