chore: move the sample's recipes beside it (just module)

- docs/examples/log-watcher/justfile carries build/accept/soak; the
  root mounts it with `mod log-watcher`, so `just log-watcher` still
  runs the acceptance (default recipe) and every doc reference stays
  valid; `just log-watcher::build` / `::soak 60` reach the rest, and
  plain `just build` works from inside the directory
- ROOT is source_directory()-based: inside a `mod`,
  justfile_directory() names the ROOT justfile's directory and every
  path would miss

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/examples/log-watcher/justfile

@@ -0,0 +1,32 @@
+# docs/examples/log-watcher — the systems-track sample workload.
+# Mounted into the root justfile as a module: `just log-watcher::<recipe>`
+# from the repo root, or plain `just <recipe>` from this directory.
+# Recipes run with this directory as the working directory.
+
+# source_directory(), not justfile_directory(): inside a `mod`, the latter
+# names the ROOT justfile's directory and every path here would miss
+ROOT := source_directory() / "../../.."
+
+# default: the acceptance test (what `just log-watcher::` runs)
+default: accept
+
+# build the self-contained executable from wo.toml: `woc <dir>` reads the
+# manifest and produces target/log-watcher (needs the compiler and runtime
+# built once: `just woc-build` and `just wovm-build` at the root)
+build:
+    {{ROOT}}/compiler/_build/default/bin/woc .
+    @ls -la target/log-watcher
+
+# the language track's acceptance test: this sample must compile with zero
+# diagnostics AND run — watch alerts on an error line, run schedules a
+# cron.d entry, the MCP server answers JSON-RPC (initialize, tools/list,
+# 401 without a token), and SIGTERM stops a server parked in accept.
+accept:
+    {{ROOT}}/scripts/log-watcher-accept.sh
+
+# the same script's opt-in soak: each mode under load for DURATION seconds,
+# resident memory and descriptor count compared against a warmed baseline
+# (256 KiB / zero-fd tolerance) — the check that catches what a seconds-long
+# run cannot. `just log-watcher::soak 60` for a longer sit.
+soak DURATION="30":
+    LW_SOAK={{DURATION}} {{ROOT}}/scripts/log-watcher-accept.sh

justfile

@@ -47,28 +47,12 @@ wovm-test:
     make -C runtime test-iso
     bash runtime/test/cli_smoke.sh
 
-# the language track's acceptance test: docs/examples/log-watcher must compile
-# with zero diagnostics AND run — watch alerts on an error line, run schedules
-# a cron.d entry, the MCP server answers JSON-RPC (initialize, tools/list,
-# 401 without a token), and SIGTERM stops a server parked in accept. This is
-# the test the whole track exists to pass; the corpus below gates the
-# individual behaviors underneath it.
-log-watcher:
-    ./scripts/log-watcher-accept.sh
-
-# the same script's opt-in soak: each mode under load for DURATION seconds,
-# resident memory and descriptor count compared against a warmed baseline
-# (256 KiB / zero-fd tolerance) — the check that catches what a seconds-long
-# run cannot. `just log-watcher-soak 60` for a longer sit.
-log-watcher-soak DURATION="30":
-    LW_SOAK={{DURATION}} ./scripts/log-watcher-accept.sh
-
-# build the sample the way a user would: `woc <dir>` reads wo.toml and
-# produces docs/examples/log-watcher/target/log-watcher (self-contained,
-# needs woc-build + wovm-build once)
-log-watcher-build:
-    ./compiler/_build/default/bin/woc docs/examples/log-watcher
-    @ls -la docs/examples/log-watcher/target/log-watcher
+# the sample workload's own recipes live beside it (build from wo.toml,
+# the acceptance test, the soak): `just log-watcher` runs the acceptance,
+# `just log-watcher::build` / `::soak 60` the rest — see the module's
+# justfile for what each does. This is the test the whole track exists to
+# pass; the corpus below gates the individual behaviors underneath it.
+mod log-watcher "docs/examples/log-watcher"
 
 # conformance harness (plan 3): walks tests/corpus/{run,compile-fail,trap},
 # exact outcome per fixture kind — see docs/plan/oop-vm/02-corpus.md.