Add Semble reference, MTEB link, and Semble in additional resources

feat: add dataset links to model card

Replace inline training script with link to train.py

Move training script to train.py

Fix model ID and update dataset IDs to minishlab convention

rewrite results note: simpler language, clarify CoIR task scope

add task relevance note below results table

add hybrid retrieval results (alpha=0.5, AVG=40.41)

remove incorrect NL->Code/Code->Code category columns

add NL->Code and Code->Code category averages, fix row highlighting

fix markdown table separator row

sort results table by avg, lead with AVG column

update results table: add CodeRankEmbed, potion-base-32M, potion-retrieval-32M

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initial commit