feat: max read file line prompt variables {{maxReadFileLine}}

[d-oit]

Context

New context variable {{maxReadFileLine}} for the maxReadFileLine setting:

TODO: add to
https://docs.roocode.com/features/footgun-prompting#using-context-variables

Implementation

created a new test \src\core\prompts_tests_\custom-system-prompt.test.ts

the existing looks old and not update to date with the current codebase before my changes:
FAIL src/core/prompts/tests/custom-system-prompt.test.ts
● Test suite failed to run

Screenshots

How to Test

See screenshot

Get in Touch

discord: d_oit

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