diff --git a/loadgen/_diag_status.lua b/loadgen/_diag_status.lua
index a3c7cf9..6deaec0 100644
--- a/loadgen/_diag_status.lua
+++ b/loadgen/_diag_status.lua
@@ -19,11 +19,13 @@
 -- Mostly 503 -> store-call is erroring (store actor down). Mostly 2xx at low
 -- load but the full bench shows non-2xx -> it's load/scale dependent.
 
+-- Locate common.lua next to this script regardless of cwd (see s2 for why).
+package.path = (debug.getinfo(1, "S").source:match("^@(.*[/\\])") or "./") .. "?.lua;" .. package.path
 local common = require("common")
 wrk.headers = common.headers
 wrk.headers["Content-Type"] = "application/json"
 
-math.randomseed(os.time() + os.getpid())
+math.randomseed(os.time() + (os.getpid and os.getpid() or 0))
 
 local body = [[{"name":"diag","email":"diag@example.test"}]]
 
diff --git a/loadgen/s2_user_get.lua b/loadgen/s2_user_get.lua
index d877f90..25438a2 100644
--- a/loadgen/s2_user_get.lua
+++ b/loadgen/s2_user_get.lua
@@ -1,11 +1,16 @@
 -- S2: single-route GET with full middleware (logger + request_id + auth).
 -- :id is spread across 10_000 values to defeat per-id caching.
 
+-- Locate common.lua next to this script regardless of cwd. wrk runs with cwd
+-- at the repo root, where 'common' is not on package.path; without this the
+-- require fails and wrk silently falls back to its default request (GET / with
+-- no auth -> 100% non-2xx).
+package.path = (debug.getinfo(1, "S").source:match("^@(.*[/\\])") or "./") .. "?.lua;" .. package.path
 local common = require("common")
 wrk.method  = "GET"
 wrk.headers = common.headers
 
-math.randomseed(os.time() + os.getpid())
+math.randomseed(os.time() + (os.getpid and os.getpid() or 0))
 
 request = function()
   local id = math.random(1, 10000)
diff --git a/loadgen/s3_mixed.lua b/loadgen/s3_mixed.lua
index 19546ec..6ace24a 100644
--- a/loadgen/s3_mixed.lua
+++ b/loadgen/s3_mixed.lua
@@ -3,11 +3,13 @@
 -- contention on axum, and gen_server message-pass on cowboy without
 -- making writes the bottleneck.
 
+-- Locate common.lua next to this script regardless of cwd (see s2 for why).
+package.path = (debug.getinfo(1, "S").source:match("^@(.*[/\\])") or "./") .. "?.lua;" .. package.path
 local common = require("common")
 wrk.headers = common.headers
 wrk.headers["Content-Type"] = "application/json"
 
-math.randomseed(os.time() + os.getpid())
+math.randomseed(os.time() + (os.getpid and os.getpid() or 0))
 
 -- A small pool of pre-built JSON bodies. Building one fresh per request
 -- in Lua would taint the bench with Lua's GC overhead.