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bvandeusen 03b3998585 feat(design-systems): the model, the parent chain, and the guard on it
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Milestone #254 step 1 (#2286). A design system becomes a record Scribe holds
rather than prose in a rulebook: a named set of tokens with an OPTIONAL parent,
so a family system carries the house style and an app system carries only what
it changes. Answering "what does this app alter?" is then `list its tokens` —
nothing to compute.

`parent_id` is the whole model. It replaces both an `always_on` flag (a family
system is one with no parent) and a subscription join table (a project points at
ONE system; the chain supplies the rest) — less schema than the rulebook shape
it mirrors.

Two decisions the task left open, settled here:

- **Token values are JSONB keyed by mode**, not `value_light`/`value_dark`
  columns. The deciding argument was not flexibility, it was ambiguity: in a
  child system an unset mode means "inherit", in a root it means "not
  mode-dependent", and as columns both are NULL and the resolver cannot tell
  them apart. As a map, resolution is `{**parent, **child}` at every level with
  no special case for roots. Against it: queryability — but nothing filters
  tokens by value in SQL, so that buys a query no caller makes.
- **`group_name` is free text, no CHECK enum.** Groupings are each design
  system's own vocabulary; a whitelist would bake one install's kit into the
  schema. No CHECK is introduced anywhere, so rule #36 does not fire.

The cascade lives in `services/design_cascade.py` as pure functions over a
`{id: parent_id}` map, importing nothing — which is what lets both the service
and `access.py` use it without a cycle, and lets a test state a whole hierarchy
in one literal. Cycles are refused on WRITE by walking up from the proposed
parent (the cheap direction), and survived on READ by a visited-set, because a
loop from a direct DB edit must truncate rather than hang.

ACL (rule #78) is deliberately asymmetric: owning a system grants write,
reaching one through a project you can see grants READ ONLY. An editor on a
shared project must not be able to rewrite the family system every other project
in that family resolves through.

Also renames `services/design_system.py` -> `design_rulebook_import.py`. It is
the #251 prose extractor, whose role is already scheduled to become a one-shot
importer (#2288), and leaving it one character away from the new
`design_systems.py` was a trap for every later session.

Rule #115 throughout: nothing seeds a system or implies a default. An install
with zero design systems is ordinary, not degraded.
2026-07-30 16:54:41 -04:00
bvandeusenandClaude Opus 5 d3ee24f239 feat(design-explorer): rulebook binding + prose→claims extraction
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Milestone #251 step 2 (#2259). The half of the drift panel that needed to be
testable, which is why it is Python: the frontend has no test runner, so the
fiddly extraction lives server-side and the browser only does set arithmetic
over live token values.

BINDING. A per-user setting `design_rulebook_id` names the rulebook that
describes this install's design system. A setting rather than a column: no
migration, discoverable in the Settings UI (rule #25), and honest about being a
per-install choice rather than a property of the rulebook. No rulebook
designated returns an empty set with rulebook_id: null — the NORMAL case for any
install but the one that set it up (rule #115), which the client renders as an
explanatory empty state rather than an error. The id comes back alongside the
list so "not designated" and "designated but empty" stay distinguishable.

EXTRACTION. No NLP. Rule statements are prose written for humans and should stay
that way, so this takes only what is unambiguous in any prose — the hex colours
and custom-property names a rule mentions. Anything subtler needs a rule author
to opt into a structured form, deliberately left for when someone wants it.

Three things earn their complexity:

- SENTENCE-SCOPED NEGATION. A rule routinely states what the palette requires and
  what it forbids in consecutive sentences ("Parchment #E8E4D8 …, Vellum #C2BFB4
  …. Pure white #FFFFFF is NEVER used."). Detecting negation across the whole
  statement would mark the required colours as forbidden — inverting the finding
  rather than missing it, which is worse. Per sentence, all four come out right.

- HEX NORMALISATION is load-bearing, not tidiness. The rulebook writes #FFFFFF
  and components write #fff; if those don't compare equal the largest drift
  finding in the codebase — 67 hardcoded white text colours (#2275) — reads as
  zero. Alpha forms keep their alpha, since #fff and #ffff are different colours
  and collapsing them would manufacture equality.

- SLASH SHORTHAND. Rulebooks write token families as --fs-radius-sm/md/lg/xl and
  --fs-obsidian/iron/slate/pewter. Both expand under one rule — prefix is
  everything up to and including the LAST hyphen of the first segment — which
  also handles --fs-dur-fast/base/slow. Verified against the real rule text: 18
  tokens from three different shorthand shapes.

how_to_apply is read alongside statement, because rulebooks routinely keep the
statement declarative and put the concrete values in how_to_apply; ignoring it
would miss the checkable half.

Claims dedupe on (kind, value), first source winning, so a colour named by
several rules is one expectation attributed to the rule that introduced it.
Prose with nothing checkable yields nothing — most rules are judgement, not
specification, and a panel that reported unparseable rules as problems would be
unusable.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs
2026-07-30 15:25:36 -04:00