docs: add architecture map rule (module ownership + life of a run)#816
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Path-scoped orientation for anyone (human or agent) editing src/: the exact call flow of a test run — including the subshell-payload inversion that explains how state crosses process boundaries — a module-ownership table, and the cross-cutting invariants (Bash 3.0 floor, return-slot pattern, fork budget, pinned binaries, snapshot width) with pointers to the rules that enforce them.
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🤔 Background
The rules cover style, TDD, testing and (recently) the fork budget, but nothing orients a contributor or agent in
src/itself — this session repeatedly re-derived the same call flow from scratch.💡 Changes
.claude/rules/architecture-map.md: the life of./bashunit tests/(entry → discovery → per-test subshell → encoded payload → aggregation → render), a module-ownership table, and the cross-cutting invariants with pointers to the rules enforcing them.src/**or the entrypoint.