docs(runbook): the profile parameter is decided, not shipped

Caught while verifying facts for a consumer notice: the runbook stated in the
past tense that `profile` landed as a keyword-only argument with a DEFAULT
default. Measured -- no door takes the argument at all. The decision is real and
stays; the claim that it is in the code was about to be repeated to a consumer
as a property they could build on.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A2aKJxLejT9S8jYwoZ9fut
This commit is contained in:
Kjell Tore Guttormsen 2026-07-26 20:18:38 +02:00
commit d77224d4ed

View file

@ -20,7 +20,9 @@ That is a design commitment with teeth, not an aspiration:
byte-stable. A consumer who does not opt in sees no change at all.
- **New public parameters are keyword-only with defaults.** A consumer's existing
positional call sites stay source-compatible across an upgrade. This is why
`profile` landed as `*, profile: BundleProfile = DEFAULT`: it turns additivity
`profile` is specified as `*, profile: BundleProfile = DEFAULT` — **decided, not
yet shipped**: measured 2026-07-26, no door takes the argument at all. It turns
additivity
from something a consumer has to measure into a property of the signature.
- **Consumer golden fixtures must not churn.** If an upgrade rewrites bytes in a
consumer's frozen fixtures, the upgrade is wrong, not the fixture.