Context

As part of PR #1607, we migrated kv-ir and clp-s implementations to use the string-blob-based clp::ffi::EncodedTextAst instead of clp::ir::EncodedTextAst to reduce small-string allocation overhead and improve deserialization performance.

However, clp::ir::EncodedTextAst is still retained in the codebase because:

• Legacy decoding methods and ffi libraries still use the older AST
• clp-text ingestion paths rely on IRv1

Task

Deprecate and eventually remove clp::ir::EncodedTextAst by migrating all remaining usage to clp::ffi::EncodedTextAst.

References

• Requested by: @LinZhihao-723
• Related PR: perf(kv-ir): Use string-blob-based encoded text AST implementation in kv-ir deserialization to avoid small string allocation overhead (resolves #1541). #1607
• Comment: perf(kv-ir): Use string-blob-based encoded text AST implementation in kv-ir deserialization to avoid small string allocation overhead (resolves #1541). #1607 (comment)