ai : limit runtime of the agent

[ggerganov]

cont #20810

• Max runtime for the agent is now 5 min (prevent loops such as https://github.com/ggml-org/llama.cpp/actions/runs/23355930365/job/67946602010#step:3:718)
• Try to workaround Multiple problems with current truncation implementation anomalyco/opencode#13770 by instructing the agent to narrow-down the search in such cases

[CISC]

Interesting, messed up formatting this time:
#20837 (comment)

[ggerganov]

Interesting, messed up formatting this time: #20837 (comment)

Yeah, the prompt has to be improved. It is ambiguous atm.