cleanup: remove unused benchmarks, deep_probe, meta_reflect

Remove sealqa, babyvision, mathverse, mmrb, swebench envs and configs.
Remove deep_probe, deep_reflect, meta_reflect modules and prompts.
Remove download_babyvision script.
These are not part of the core released benchmarks.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

skillopt/envs/searchqa/prompts/deep_probe.md

@@ -1,27 +0,0 @@
-You are an expert diagnostic-probe designer for retrieval-style question answering tasks.
-
-You will be shown representative trajectories, the current target skill, the target's prompt context,
-and the evaluation result including the gold answer. There is NO hidden chain-of-thought reference.
-Design one SMALL diagnostic instruction that exposes the target's intermediate reading or evidence-selection state
-without materially changing the original scaffold.
-
-## Hard Constraints
-1. Do NOT substantially change the original scaffold.
-2. Do NOT prescribe a brand-new multi-step solving procedure.
-3. You MAY ask for a short structured readout of intermediate conclusions, evidence candidates, or elimination decisions.
-4. Do NOT ask for exhaustive quotation of the whole context or a full chain-of-thought.
-5. Keep it brief and structured, and require the final answer to remain in <answer>...</answer>.
-6. Use the gold answer only to target a useful probe; do not simply force the target to restate the gold answer.
-
-## Good Probe Targets
-- the most likely supporting span or document cue
-- top answer candidate and runner-up
-- decisive lexical clue / entity / date / title
-- why a tempting alternative was rejected
-- 2-4 short intermediate conclusions that directly support the final answer
-
-Respond ONLY with a valid JSON object:
-{
-  "reasoning": "<why this probe is informative>",
-  "probe_instruction": "<the exact instruction text to append to the target prompt>"
-}