fix: make the integration work against a Claude proxy

- Treat an empty tool argument string as no parameters instead of raising
  JSONDecodeError; the proxy sends "" for tools like the timer status
  (upstream issue #3).
- Do not replay earlier web searches in the history. The chat log keeps only
  their status, and a search without results makes the model disown the
  answers it based on it and search again (upstream issue #4).
- Look up the home location for web search with the subentry's model instead
  of gpt-4o-mini, and save the options without city/region if the lookup
  fails (upstream issue #5).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -4,6 +4,23 @@
 [![validate](https://github.com/adamjs83/ha-openai-compatible/actions/workflows/validate.yaml/badge.svg)](https://github.com/adamjs83/ha-openai-compatible/actions/workflows/validate.yaml)
 [![HACS: custom](https://img.shields.io/badge/HACS-custom-41BDF5.svg)](https://hacs.xyz)
 
+> **Fork of [adamjs83/ha-openai-compatible](https://github.com/adamjs83/ha-openai-compatible) v0.2.1**
+> with fixes for running it against a proxy that serves Claude models. Drop it once
+> upstream has fixed these issues:
+>
+> - [#3](https://github.com/adamjs83/ha-openai-compatible/issues/3): a tool call with an
+>   empty argument string (tools without parameters) is treated as `{}` instead of
+>   raising `JSONDecodeError`.
+> - [#4](https://github.com/adamjs83/ha-openai-compatible/issues/4): earlier web searches
+>   are not replayed in the history; they carry no results, and the model then disowns
+>   its own answers and searches again.
+> - [#5](https://github.com/adamjs83/ha-openai-compatible/issues/5): the home location
+>   lookup for web search uses the subentry's model instead of `gpt-4o-mini`, and a
+>   failed lookup no longer blocks saving the options.
+>
+> HACS only installs from GitHub, so this fork is installed by copying
+> `custom_components/openai_compatible` into the Home Assistant config.
+
 Home Assistant's built-in **OpenAI** integration, with one change that matters: the
 **API base URL is configurable**. Point Home Assistant's conversation agent, AI Task,
 speech-to-text and text-to-speech at any OpenAI-compatible endpoint — LiteLLM, vLLM,