test/51_composition and test/52_sequence hardcode /srv/langs/nolang — battery not portable (caught by CI on first run)

[arkh-node]

What breaks

The new CI workflow (#21) fails its first run with УПАЛО: 2:

test/51_composition.lisp ❌ УПАЛ (код 1)   Unhandled SB-INT:SIMPLE-FILE-ERROR
test/52_sequence.lisp    ❌ УПАЛ (код 1)   Unhandled SB-INT:SIMPLE-FILE-ERROR

Root cause — absolute paths hardcoded to the author's workstation:

test/51_composition.lisp:1: (load "/srv/langs/nolang/src/parse.lisp")
test/52_sequence.lisp:1:    (load "/srv/langs/nolang/src/verdict.lisp")

Both files landed in d731e5d without a battery run — locally they load by accident (the clone happens to live at /srv/langs/nolang). Every other test in the battery uses the portable convention:

(load (merge-pathnames "../src/check.lisp" *load-pathname*))   ; e.g. test/40_types.lisp

Fix

Two one-line changes to the portable merge-pathnames form. No behavior change on any machine where the tests currently work.

Related (out of scope here, same disease)

repl.lisp hardcodes /srv/langs/nolang in three places (lines 30, 108, 110). The REPL is outside the battery, so fixing it belongs in its own PR.

Proof

Both tests green locally after the fix; the CI workflow (#21) green after this merges.