test: share Paper guard root inventory

[Chris0Jeky]

Summary

• Add one PAPER_VIEW_ROOTS inventory for all 22 Paper view roots.
• Derive both the eyebrow-token and Legacy substrate guards from that inventory.
• Keep the raw Vue source imports in a compile-time checked map so a new root cannot silently omit its source.
• No production view, CSS, lockfile, or generated file changes.

Verification

• npx vitest run tests/paper-eyebrow-token.spec.ts src/tests/views/paperViewLegacySubstrate.spec.ts — 70 passed.
• npm run typecheck — passed.
• npx eslint src/tests/views/paperRootInventory.ts src/tests/views/paperViewLegacySubstrate.spec.ts tests/paper-eyebrow-token.spec.ts — passed.
• git diff --check — passed.

Two coordinator review passes found no correctness, scope, or test-hygiene blockers. The hosted automatic Codex review was unavailable because the account had reached its code-review usage limit; no merge is being requested here.

The isolated npm ci needed for verification reported two moderate audit advisories; no package files changed and no audit remediation was attempted.

Refs #1868

[chatgpt-codex-connector]

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[Chris0Jeky]

Review gate (Codex review credits exhausted, SC-9; D-12 ruled 2026-09-05: the Codex session's PRs are reviewed and merged by the coordinator): one fresh-context read-only reviewer (Opus 5) on head bd6558bfe. Verdict: SHIP.

Checked by reading: the 22 inventory entries match exactly the flat .paper-* roots under src/views/*.vue on main, none omitted, none extra; the derived lists equal the two guards' previous lists entry by entry (22 substrate pairs, 20 eyebrow pairs, Chat and DevTools the two without an eyebrow); every VIEW_SOURCES pairing matches its ?raw import and a mispairing would throw in readRootRule; the guard bodies are unchanged; the compile-time claim holds (the substrate spec is type-checked and PaperViewName is the literal union); 22x2 + 1 + 4 + 20 + 1 = 70 matches the body; the helper is not collected as an empty spec.

Findings and disposition (all LOW, tracked on #1868):

• the header calls the list "complete" and says it prevents drift when a new root is added, but nothing scans the views tree; a new root is still invisible to both guards until this file is edited, and the core-loop roots are deliberately excluded.
• PAPER_VIEW_ROOTS.flatMap(({ view, eyebrow }) => ...) destructures eyebrow from a union where two members lack it; fine today because the root tests/ lane is not type-checked (#1607).
• the per-wave provenance comments were dropped.

Issue disposition: slice of #1868 (the two guards share one list; the inventory remains hand-maintained).