docs: the opt-link question has an answer and a stated coverage limit

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
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Sylpheed RE agent
2026-08-24 04:09:30 +00:00
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@@ -199,7 +199,16 @@ See [`structures/ui-composable-bundles.md`](structures/ui-composable-bundles.md)
See [`structures/ui-rat-layout.md`](structures/ui-rat-layout.md). See [`structures/ui-rat-layout.md`](structures/ui-rat-layout.md).
* ❔ **What makes a bundle a screen rather than a fragment.** `is_composable` * ❔ **What makes a bundle a screen rather than a fragment.** `is_composable`
admits 1 786 extra bundles, mostly 2–5-element button+glow fragments. admits 1 786 extra bundles, mostly 2–5-element button+glow fragments.
* ❔ **What `opt ` links.** Refuted as focus; unexplained otherwise. * 🟡 **What `opt ` links — a record→record reference** (2026-08-24, measured
disc-wide and asserted). All **1 467** links reachable from a declaration table
resolve to a **RATC child of their own bundle**, all are `.rat → .rat`, none
dangle, none self-link. **1 076 (73 %)** are the `<stem>f` focus pattern; the
rest are **chains** between effect records (`px_bunk_eff01 → pjex_eff →
pjex_eff07`), which is also why only 227 targets are declared elements — the
middle of a chain is, the end is not. So focus is the commonest *use*, not the
meaning. ⚠️ Coverage: 18 718 raw `opt ` tags exist against 1 467 classified —
`opt_link` reads the first tag of a declared element's record, so ~92 % of
occurrences sit deeper in the chains and are untested.
The investigation that got here follows, kept in full because most of it is The investigation that got here follows, kept in full because most of it is
refutations that were worth the cost. refutations that were worth the cost.