systemd: fix stale ExecStart on triage + selfimprove units (noether)

Both pointed at /usr/local/bin/<name>, which no longer exists (removed at
some point, likely the same de-shadowing pass that took out the sic shadow
copies) — the correct path, matching every other noether-scope unit
(doctor, grinder-{py,godev,jsdev}), is the ~/.local/bin symlink into this
repo. Neither unit was ever actually re-exec'd since the file went away, so
this was silent: a running process from before the removal kept going, and
only a fresh restart/timer-fire would hit ENOENT (systemd 203/EXEC).

Found by restarting bullpen-triage.service after the escalation-dedup fix
(previous commit) and hitting exactly that. Checked selfimprove too since it
has the identical ~/.local/bin-symlink-but-unit-says-/usr/local/bin shape --
same bug, same fix. Both verified live: triage active+running, selfimprove
oneshot exits 0/SUCCESS.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

systemd/bullpen-selfimprove.service

@@ -4,4 +4,4 @@ After=network-online.target
 
 [Service]
 Type=oneshot
-ExecStart=/usr/local/bin/bullpen-selfimprove
+ExecStart=/home/mfritsche/.local/bin/bullpen-selfimprove

systemd/bullpen-triage.service

@@ -5,7 +5,7 @@ After=network-online.target
 [Service]
 Type=simple
 Environment=PATH=/home/mfritsche/.local/bin:/usr/local/bin:/usr/bin:/bin
-ExecStart=/usr/local/bin/bullpen-triage
+ExecStart=/home/mfritsche/.local/bin/bullpen-triage
 Restart=always
 RestartSec=5