* feat(openclaw): add recallInjectionPosition config to preserve prompt cache
Add configurable injection position for recalled memories to avoid
breaking prefix-based prompt caching (Anthropic/Google) when agents
have large static system prompts.
Options: 'prepend' (default, current behavior), 'append' (end of
system prompt, preserves cache), 'user' (before user message).
Closes#703
* docs(openclaw): document all plugin config flags
Add missing config options to the OpenClaw docs: recallTopK,
recallTypes, recallContextTurns, recallMaxQueryChars,
recallPromptPreamble, recallInjectionPosition, recallRoles,
retainEveryNTurns, retainOverlapTurns, and debug.
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