fix(e2e/docker): point log assertion at per-harness tmp path

v0.19.0 moved plugin log writes from `${tmpdir}/magic-context.log` to
`${tmpdir}/opencode/magic-context/magic-context.log` (OpenCode) and
`${tmpdir}/pi/magic-context/magic-context.log` (Pi) so OpenCode Desktop
stops firing permission prompts on log writes. The Docker E2E scripts
still asserted against the old flat path, so both harness suites
failed at the `magic-context plugin log exists` check on the v0.19.0
tag run.

Updates `tests/docker/test-opencode-e2e.sh` and
`tests/docker/test-pi-e2e.sh` to use the new paths. No other E2E
files referenced the old path.

Author: ualtinok

tests/docker/test-opencode-e2e.sh

@@ -21,7 +21,7 @@ NC='\033[0m'
 PASS=0
 FAIL=0
 DB_PATH="$HOME/.local/share/cortexkit/magic-context/context.db"
-PLUGIN_LOG="$(node -e 'console.log(require("os").tmpdir())')/magic-context.log"
+PLUGIN_LOG="$(node -e 'console.log(require("os").tmpdir())')/opencode/magic-context/magic-context.log"
 
 check() {
     local label="$1"

tests/docker/test-pi-e2e.sh

@@ -21,7 +21,7 @@ NC='\033[0m'
 PASS=0
 FAIL=0
 DB_PATH="$HOME/.local/share/cortexkit/magic-context/context.db"
-PLUGIN_LOG="$(node -e 'console.log(require("os").tmpdir())')/magic-context.log"
+PLUGIN_LOG="$(node -e 'console.log(require("os").tmpdir())')/pi/magic-context/magic-context.log"
 
 check() {
     local label="$1"