[Frontend] ADR-0053 guard maintenance residuals: badge dE spacing, dual root lists, guard escape hatch (PR #1865 review)

[Chris0Jeky]

Residuals from the PR #1865 review (ADR-0053 token tuning, #1842):

1. Badge tint distinctness is string-level, not perceptual — pairwise CIE76 dE between the five Paper badge fills has close pairs; if type identification matters, re-space the hues (measure, don't eyeball).
2. Two hand-maintained root lists — paper-eyebrow-token.spec.ts EYEBROW_ROOTS (20) vs paperViewLegacySubstrate.spec.ts roots (22) have no mechanical link; a new Paper root can silently miss one list. Derive both from one source.
3. Tightened invariant regex now rejects a future correctly-scoped body.paper .x bridge rule — intentional strictness, but record the escape hatch (rename/annotate) before someone needs it.
4. Exempt-rule body check is an exact string match (.toBe('color-scheme: light;')) — reformatting fails the guard; loosen to a structural match when next touched.
5. Core-loop eyebrow guard shape — it asserts no *__eyebrow* BEM rule declares color, but a core-loop surface could still override .tk-eyebrow by other selectors; note the gap.
6. The dark:-is-dead justification rests on src/style.css:3 @config "../tailwind.config.js", named nowhere in the comment/ADR/PR — one clause in the ADR would pin the mechanism.

Source: PR #1865 review non-blocking items N1-N6.

[Chris0Jeky]

Claiming bounded lane alpha-product-trust / TD-1868-shared-roots from base 627fbdefe7ef9cb963f10bea78d8b5fbd62113b1. Scope: make the Paper eyebrow and Legacy substrate guard specs consume one shared Paper-root inventory, preserving the current 20 eyebrow roots and the two no-eyebrow roots. Owned paths: frontend/taskdeck-web/src/tests/views/paperRootInventory.ts (new), frontend/taskdeck-web/tests/paper-eyebrow-token.spec.ts, and frontend/taskdeck-web/src/tests/views/paperViewLegacySubstrate.spec.ts. No CSS, theme, color, selector-policy, or Tailwind changes.

[Chris0Jeky]

Released the bounded shared-root inventory slice in PR #2644 at exact head bd6558bfeea9ec85c04649720aead32ba10bdfbf. The two Paper static guards now derive from one 22-root inventory; focused guard tests pass 70/70, typecheck and scoped lint pass, and no production files changed. Automatic Codex review is unavailable at the current account limit, so this remains unmerged pending the normal review/gate path.

[Chris0Jeky]

Coordinator note (2026-09-05, D-12 sweep): the Codex session's PR on this issue was reviewed by one fresh-context Opus 5 reviewer (record on the PR) and merged with a merge commit. The PR body used Refs, so this issue stays open; what merged and what remains, from the review:

• PR #2644 merged as 685cbce82: one PAPER_VIEW_ROOTS inventory (22 roots, matching the flat .paper-* roots under src/views exactly) feeds both the eyebrow-token and Legacy substrate guards; no assertion lost. LOWs tracked here: the header calls the list complete and drift-proof, but nothing scans the views tree, so a new Paper root is still invisible to both guards until the file is edited (and the core-loop roots are deliberately excluded); flatMap(({ view, eyebrow }) => ...) destructures a property two union members lack, fine only because the root tests/ lane is not type-checked (#1607); the per-wave provenance comments were dropped.