A number or string that two reasonable deployments could want set
differently — a timeout, grace period, output cap, result-count limit,
model name, base URL — belongs on the plugin's schemastery Config with
the shipped value as its default, not in a bare literal or module
constant. A DEFAULT_* constant or a test-only injection seam is not
configurability: the test is whether a cordis.yml deployment can change
the value without a code edit. Protocol/wire constants, semantic
constants, values pinned by an external spec, and security invariants
stay hardcoded.
The convention lands in AGENTS.md § Conventions (the authoritative
source the review skill cites); dsh-code-review gains the matching
reviewer-only check, since no mechanical gate can detect a hardcoded
tunable.
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