Make the MAX_OUTPUT_LENGTH in bash.ts overridable by env variable.

[cc-bjojac]

The motivation behind this is that when opencode executes my tests in a large project, it truncates the output at some point. I was not able to see what test actually failed in the console.

I made the parameter overridable by an env variable with fallback to the original hard-coded value if it is not present or could not be parsed.

[rekram1-node]

I feel like a variable with this name would apply to other tools as well, (even tho in your pr it isn't) is that your intention or should we make it bash tool specific?

[cc-bjojac]

My intention was to do it only for the bash tool to be honest. I can make the env parameter name more specific like OPENCODE_BASH_MAX_OUTPUT_LENGTH

[rekram1-node]

/oc adjust the env var to be prefixed by OPENCODE_EXPERIMENTAL_ instead of just OPENCODE_

Update both files

[opencode-agent]

Updated both files to use OPENCODE_EXPERIMENTAL_BASH_MAX_OUTPUT_LENGTH instead of OPENCODE_BASH_MAX_OUTPUT_LENGTH.

opencode session  |  github run

[rekram1-node]

I'm going to make this experimental for now because ideally the settings should all be configurable in a much better way.

Experimental doesnt mean im getting rid of it next week it's just so that we dont have to be committed to this var forever