Harden giant receipt fetch CLI

agents.md

@@ -0,0 +1,23 @@
+# agent rules
+
+## priorities
+- optimize for simplicity, boringness, and long-term maintainability
+- prefer minimal diffs; avoid refactors unless required for the active task
+
+## tech stack
+- python; pandas or polars
+- file storage: json and csv, no sqlite or databases
+- do not add new dependencies unless explicitly approved; if unavoidable, document justification in the active task notes
+
+## workflow
+- prefer direct argv commands (no bash -lc / compound shell chains) unless necessary
+- work on ONE task at a time unless explicitly instructed otherwise
+- at the start of work, state the task id you are executing
+- do not start work unless a task id is specified; if missing, choose the earliest unchecked task and say so
+- propose incremental steps
+- always include basic tests for core logic
+- when you complete a task:
+  - mark it [x] in pm/tasks.md
+  - fill in evidence with commit hash + commands run
+  - never mark complete unless acceptance criteria are met
+  - include date and time (HH:MM)