The CCR (Content-Compression-Retrieve) engine treated an entire message's
content as one candidate block with no sub-scanning, so a large first-turn
prompt above minChars (default 600) could be replaced ENTIRELY by a bare
[CCR retrieve hash=... chars=N] marker. The omniroute_ccr_retrieve MCP tool
that could resolve that marker is only ever exposed by OmniRoute's own MCP
server -- never injected into a plain /v1/chat/completions tools array --
so for any non-MCP client (OpenCode, Claude Code in OpenAI-compatible mode,
generic proxy clients) the original prompt became permanently unreachable
once compressed.
maybeCcrReplace now always keeps a short leading preamble of the original
text alongside the marker, so a caller that cannot resolve the marker still
sees the start of the user's intent instead of losing the prompt entirely.
The full text remains stored and verbatim-retrievable by hash for MCP-
capable callers, unchanged.
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