[llm] playground for LLM-related interaction#1019
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Introduce an interactive REPL for LLM coding agents driving EasyCrypt (`easycrypt llm`) using a line-oriented protocol over stdin/stdout, plus two CLI flags for goal inspection: - `-upto <pos>` compile up to a given position and print the goals - `-lastgoals` print the last unproven goals at end-of-file REPL protocol (see `doc/llm/CLAUDE.md` for the full guide): - LOAD "file.ec" [LINE[:COL]] -- compile, optionally up to a position - UNDO / REVERT <uuid|name> -- navigate proof state - GOALS / GOALS ALL -- inspect current or all subgoals - CHECKPOINT <name> -- named bookmarks for branching - SEARCH <pattern> -- lemma search - QUIET ON/OFF -- suppress goal display for bulk input - Direct EasyCrypt input (tactics, declarations, search, print, ...) Responses use a typed envelope (OK/ERROR with uuid) terminated by an `<END>` sentinel for reliable parsing. LOAD reports the last processed line in the response tag; error messages include the offending source text; only the current subgoal is shown by default with a remaining count.
Add a -trace flag to the LOAD REPL command. When set, LOAD compiles the prefix exactly as today (using the existing LINE[:COL] argument, or up to EOF if omitted), but defers the last sentence and runs it under goal capture, then returns a response body with four delimited blocks: === BEFORE: line L (col C) === <focused goal before the sentence> === TACTIC (lines L:C - L':C') === <exact source text of the sentence> === AFTER: line L (col C) === <new focused goal + any new sibling goals> === SUMMARY === open goals: N1 -> N2 Adapted from PR #1018 (-trace LINE[:COL] for batch mode): same delimiters and the same new-or-modified-head filtering for AFTER. The position is taken from LOAD's existing LINE[:COL] argument; the tag is the regular [loaded:file:LINE]. If the deferred sentence is outside a proof context, or there is no sentence to trace, the reply uses the ERROR envelope with a clear message. If the sentence fails, the BEFORE/TACTIC blocks are still delivered, AFTER carries a <sentence failed> marker, and the formatted exception is appended. Expose EcCommands.in_proof so the REPL can check the pre-execution proof status without inspecting scope internals.
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Playground branch for experimenting with LLM-driven EasyCrypt interaction.
Not intended for review or merge in its current form — kept as a draft so
the work-in-progress is visible.