docs: audit the ui library and record the 0.8.6 migration

A measured pass rather than a bulk rewrite. Numbers come from the source and
from a browser.

The migration entry covers what has accumulated since 0.8.5 and would
otherwise reach upgraders unannounced: the Tabs output contract, the Sidebar
BEM rename, the layout components leaving Tailwind so their rendered class
lists changed, LayoutSplitter and CustomScrollbar changing props and outputs,
the ui.css families that were removed, and the theme tokens that now paint
where they previously resolved to nothing.

The audit records what is still wrong, with counts: 32 outputs across 16
components that nothing emits, 23 components still on the scaffold pattern, 66
without a local style block and therefore dependent on ui.css, and 10 still
using Tailwind. A test pins the dead-output count at 32 as a ceiling that only
moves down, so rebuilding a component tightens it and no new one can be added
quietly.

It also records what is not worth doing. Splitting the runtime saves 3 to 4 kB
gzipped on a first visit to a file cached for a year, and hydration costs
1.5 ms for 21 scopes across 4325 elements, so neither is a real problem.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/ui-library-audit-2026-08-08.md

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+# UI library audit — 2026-08-08
+
+A measured pass over `@wrnexus/ui` after the navigation and layout groups were
+rebuilt. Numbers come from the source and from a browser, not from estimates.
+
+## Fixed in this pass
+
+**Ten theme tokens were referenced and never defined.** An undefined custom
+property does not warn — it resolves to nothing — so the styles that used them
+silently did nothing:
+
+| Token                         | Effect while undefined                                    |
+| ----------------------------- | --------------------------------------------------------- |
+| `--wire-color-focus`          | Focus rings drew with no colour, in 14 components         |
+| `--wire-color-surface-soft`   | Every soft surface rendered transparent, in 27 components |
+| `--wire-color-on-danger`      | Text on danger fills had no colour                        |
+| `--wire-color-surface-subtle` | Subtle panels rendered transparent                        |
+| `--wire-color-input-*` (6)    | Input backgrounds, borders and placeholders unstyled      |
+| `*-hover`, `*-contrast`       | Missing for info, success, warning and danger             |
+
+They are derived in the theme now, so they follow the palette and the accent.
+Verified in a browser: 38 tokens referenced, **0 undefined** (was 10).
+
+Two mistakes worth recording, because both nearly became wrong conclusions:
+
+- A first version of the check read the theme _source_ and reported a dozen
+  false positives, because most tokens are generated per palette rather than
+  written as literals. The check now reads the **rendered** theme CSS.
+- The semantic token spread sat _after_ the primary and secondary palette
+  entries, so it would have overridden them. It now sits before.
+
+## Outstanding, with numbers
+
+**32 outputs across 16 components have no emitter of any kind.** This is the
+bug LayoutSplitter had: the component advertises an output, a caller binds to
+it, and nothing ever fires. Native event names are excluded — the runtime binds
+a DOM-listener fallback on component tags, so `click` and `input` do arrive.
+
+| Component                            | Dead outputs                              |
+| ------------------------------------ | ----------------------------------------- |
+| FileUpload                           | upload, progress, success, cancel, remove |
+| ToastNotifications                   | add, dismiss, clear, action               |
+| AdvancedDatePicker                   | open, close, clear                        |
+| Card                                 | action, navigate, dismiss                 |
+| Accordion                            | open, close                               |
+| AdvancedRangeSlider                  | start, end                                |
+| Chart                                | dataPointClick, legendToggle              |
+| Confetti                             | start, complete                           |
+| TreeView                             | expand, collapse                          |
+| AnnouncementBar, Badge, Toast, alert | dismiss                                   |
+| AvatarGroup                          | overflow                                  |
+| CopyMarkup                           | success                                   |
+| Footer                               | action                                    |
+
+A test pins this at 32 as a ceiling that only moves down.
+
+**23 components are still on the `wire-next` scaffold pattern** — no style
+block, no functions, and for 19 of them an outputs block they never honour.
+These are the same shape as the Table scaffold that was removed and the
+LayoutSplitter scaffold that was rebuilt.
+
+**66 of 108 components have no local style block**, so they depend on
+`ui.css`. That matters for delivery: a migrated component ships its CSS only
+when it renders, while `ui.css` is served whole to every page — 175,848 bytes,
+**25,908 gzipped**. Migrating the remainder would shrink it toward nothing.
+
+**10 components still use Tailwind utilities**: FeatureIconCard, HeroActions,
+InputNumber, List, Map, Marquee, SearchBox, TextLink, Timeline, button.
+
+## Not worth doing
+
+**Splitting the runtime into chunks.** Measured rather than assumed:
+`reactive.js` is 69,947 bytes minified, roughly 21 kB gzipped, served as its
+own file with a one-year immutable cache. Component-specific controllers are
+about 18% of it, so splitting them out saves 3–4 kB gzipped on a first visit
+and nothing after that. That is a poor return for lazy-loading complexity.
+
+Hydration is not a bottleneck either: 21 scopes across 4,325 elements rehydrate
+in 1.5 ms, and the shared document observer cost 0.9 ms across three seconds of
+the busiest activity in the library.
+
+## Known framework defects
+
+- **A component output is not delivered to a parent binding in at least one
+  case.** LayoutSplitter emits `sizeChange` and the component genuinely fires
+  the event, but `@sizeChange` on the tag is not invoked. Outputs work
+  elsewhere, so this is narrow and unexplained. Renaming away from the native
+  `resize` did not fix it, so the first hypothesis was wrong.
+- **A component tag nested inside another component slot is dropped**, leaving
+  only its children.
+- **Component props and slot content render once** and do not track page state,
+  so the controlled-component pattern does not work.
+- **i18n text is not server-rendered.** Nav links ship as empty spans and are
+  filled by the client, so navigation is blank until the runtime loads.