The build-telemetry tools of paperkit's tools/, ported here (mtools:W543, paperkit:W142). Behaviour is paperkit's; the entry points are console scripts and python -m modules instead of paths. Standard library only.

project_endpoints is left out: it locates .bazelrc from the module's own path (Path(__file__).resolve().parents[1]), which is paperkit's tree and has no meaning for an installed module. Which .bazelrc it edits is a decision for paperkit, not a guess here.

• Each module has main(argv=None) and a __main__ guard; paperkit's # noqa waivers became structure. Child processes (pgrep, bazel) go through proc, and every module that reaches the network, a child, /proc or a clock takes it as a parameter, which is how the tests drive them.
• coord_sample handles SIGINT inside main (paperkit did it in the __main__ guard), so the console script exits 0 on it too.
• probe: the marker line names mikemol.buildtel.probe instead of tools/probe.py; the revert is verified after the finally that performs it, because a return inside a finally swallows the exception being unwound.
• buildpulse --selftest: its checks are (name, verdict) pairs, and their labels are ASCII (delta, =>) where paperkit's were Greek and angle-bracket glyphs.
• image_digest: a digest reply that is JSON but not an object is absent (paperkit raised AttributeError).
• bb_records and logs_push print their module's own name in usage and messages instead of the script path.

image_digest still names luthen-observability's checkout by absolute path (/home/mikemol/github/luthen-observability), as paperkit's did; directory is a parameter.