Complete Phase 1 ingestion. Add a least-privilege IAM user
(apm-wo-drop-uploader) to the pipeline stack, scoped to s3:PutObject
on the raw/ prefix only — the local launchd uploader authenticates as
this user via a dedicated profile, so a laptop credential leak cannot
read, list, or touch the analytics data.
Replace the scaffold uploader stub with the hardened stampli-pattern
script (lockfile, logging, timestamped archive, notifications, settle
delay) and align names to the convention (~/apm-wo-drop, ~/.local/bin,
com.seahaven.apm-wo-uploader). The plist sets PATH/HOME because launchd
runs with a stripped environment and otherwise cannot find aws.
The exports bucket already shipped in the Phase 0 scaffold, so the code
delta here is the uploader identity and tooling.
