feat(ui): add assignment history read states

.github/workflows/hr-workspace-assignment-history-state.yml

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+name: HR Workspace Assignment History State Quality
+
+on:
+  pull_request:
+    branches:
+      - develop
+      - feat/hr-workspace-protected-read-state
+    paths:
+      - "apps/hr-workspace/assignment-history-state.js"
+      - "apps/hr-workspace/assignment-history-state.css"
+      - "apps/hr-workspace/assignment-history-state.stories.js"
+      - "tests/hr-workspace-assignment-history-state.test.mjs"
+      - "docs/traceability/hr-workspace-assignment-history-state.md"
+      - "docs/doctoring/hr-workspace-assignment-history-accessibility-references.md"
+      - ".github/workflows/hr-workspace-assignment-history-state.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: hr-workspace-assignment-history-state-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  assignment-history-state:
+    name: Assignment history state contract
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout exact candidate
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          persist-credentials: false
+      - name: Prove exact candidate checkout
+        env:
+          ORGMETRA_EXPECTED_HEAD_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+        run: test "$(git rev-parse HEAD)" = "$ORGMETRA_EXPECTED_HEAD_SHA"
+      - name: Set up Node.js LTS
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: "24"
+          check-latest: false
+      - name: Run assignment-history accessibility contract with exact coverage
+        run: >-
+          node --test --experimental-test-coverage
+          --test-coverage-lines=100
+          --test-coverage-branches=100
+          --test-coverage-functions=100
+          tests/hr-workspace-assignment-history-state.test.mjs
+      - name: Require clean checkout
+        run: |
+          git diff --exit-code
+          test -z "$(git status --porcelain)"

apps/hr-workspace/assignment-history-state.css

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+.assignment-history-state {
+  display: grid;
+  gap: var(--orgmetra-space-md);
+  max-width: 42rem;
+  padding: var(--orgmetra-space-lg);
+  border: 1px solid var(--orgmetra-border-subtle);
+  border-radius: var(--orgmetra-radius-md);
+  background: var(--orgmetra-surface-card);
+  color: var(--orgmetra-text-primary);
+}
+
+.assignment-history-status,
+.assignment-history-next-action {
+  display: grid;
+  gap: var(--orgmetra-space-xs);
+  margin: 0;
+}
+
+.assignment-history-status span,
+.assignment-history-next-action span {
+  color: var(--orgmetra-text-muted);
+}
+
+.assignment-history-state[data-interaction-state="read-only"] {
+  border-color: var(--orgmetra-border-subtle);
+}
+
+.assignment-history-state[data-interaction-state="permission-denied"],
+.assignment-history-state[data-interaction-state="validation-error"],
+.assignment-history-state[data-interaction-state="error"] {
+  border-color: var(--orgmetra-danger);
+}
+
+.assignment-history-state[aria-busy="true"] {
+  cursor: progress;
+}
+
+.assignment-history-action {
+  justify-self: start;
+  min-height: 44px;
+  padding: var(--orgmetra-space-sm) var(--orgmetra-space-md);
+  border: 0;
+  border-radius: var(--orgmetra-radius-sm);
+  background: var(--orgmetra-action-review);
+  color: #fff;
+  font: inherit;
+  cursor: pointer;
+}
+
+.assignment-history-action:disabled {
+  cursor: not-allowed;
+  opacity: 0.62;
+}
+
+.assignment-history-action:focus-visible {
+  outline: 3px solid var(--orgmetra-focus-ring);
+  outline-offset: 3px;
+}

apps/hr-workspace/assignment-history-state.js

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+const STATE_MODELS = Object.freeze({
+  idle: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'polite', role: 'status', actionDisabled: false,
+    interactionState: 'default', actionLabel: 'Load assignment history',
+    label: 'Review assignment history',
+    message: 'Load fresh purpose-authorized Assignment history for the requested business-time and system-knowledge coordinate.',
+    nextAction: 'Load the current authorized Assignment history before relying on this Employee Profile evidence.',
+  }),
+  loading: Object.freeze({
+    ariaBusy: 'true', ariaLive: 'polite', role: 'status', actionDisabled: true,
+    interactionState: 'loading', actionLabel: 'Loading assignment history',
+    label: 'Loading assignment history',
+    message: 'Orgmetra is resolving the authorized fields and visible Assignment versions at the requested known-at coordinate.',
+    nextAction: 'Wait for the governed Assignment-history read to finish.',
+  }),
+  ready: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'polite', role: 'status', actionDisabled: true,
+    interactionState: 'read-only', actionLabel: 'Assignment history loaded',
+    label: 'Assignment history ready',
+    message: 'This is read-only bitemporal Assignment history. Effective time shows when a fact applied; system-recorded time shows when Orgmetra knew it. This evidence does not authorize Assignment mutation and does not infer current worker status beyond the exact known-at snapshot.',
+    nextAction: 'Use only the authorized visible fields; start a separately authorized change if Assignment truth must be updated.',
+  }),
+  empty: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'polite', role: 'status', actionDisabled: false,
+    interactionState: 'read-only', actionLabel: 'Reload assignment history',
+    label: 'No assignment history is visible here',
+    message: 'No Assignment version is visible at this authorized business-time and known-at coordinate. This is not evidence of no Employment or no Assignment evidence outside this coordinate.',
+    nextAction: 'Check the authorized time coordinate and reload if another business-time or known-at view is required.',
+  }),
+  denied: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'assertive', role: 'alert', actionDisabled: false,
+    interactionState: 'permission-denied', actionLabel: 'Review access',
+    label: 'Assignment history access denied',
+    message: 'The current purpose or actor authority does not permit this Assignment-history read.',
+    nextAction: 'Check the HR purpose and access authority before requesting Assignment history again.',
+  }),
+  stale: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'assertive', role: 'alert', actionDisabled: false,
+    interactionState: 'validation-error', actionLabel: 'Reload assignment history',
+    label: 'Assignment history evidence is stale',
+    message: 'The requested known-at coordinate or authoritative Assignment evidence changed before this view could be relied on.',
+    nextAction: 'Reload the purpose-authorized Assignment history at an explicit fresh known-at coordinate.',
+  }),
+  scopeBlocked: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'assertive', role: 'alert', actionDisabled: false,
+    interactionState: 'validation-error', actionLabel: 'Narrow requested fields',
+    label: 'Assignment history fields are not authorized',
+    message: 'One or more requested Assignment-history fields fall outside the current purpose-bound authorization.',
+    nextAction: 'Narrow the requested fields to the authorized set or obtain the required HR access before retrying.',
+  }),
+  error: Object.freeze({
+    ariaBusy: 'false', ariaLive: 'assertive', role: 'alert', actionDisabled: false,
+    interactionState: 'error', actionLabel: 'Retry governed read',
+    label: 'Assignment history unavailable',
+    message: 'The governed Assignment-history read did not return usable authoritative evidence.',
+    nextAction: 'Do not infer Assignment or Employment status from cached or partial data; verify the service and authorization before retrying.',
+  }),
+});
+
+function requireExactState(value) {
+  if (typeof value !== 'string') {
+    throw new TypeError('assignment-history state must be an exact built-in string');
+  }
+  if (!Object.hasOwn(STATE_MODELS, value)) {
+    throw new TypeError(`unsupported assignment-history state: ${value}`);
+  }
+  return STATE_MODELS[value];
+}
+
+/** Return immutable accessibility semantics for one purpose-bound Assignment-history interaction state. */
+export function assignmentHistoryViewModel(state) {
+  return requireExactState(state);
+}
+
+/** Render static Storybook evidence without accepting caller-controlled HR values or identifiers. */
+export function assignmentHistoryStateMarkup(state) {
+  const model = requireExactState(state);
+  const disabled = model.actionDisabled ? ' disabled' : '';
+  return `<section class="assignment-history-state" data-figma-node-id="1:64" data-interaction-state="${model.interactionState}" aria-busy="${model.ariaBusy}">\n  <p class="assignment-history-status" role="${model.role}" aria-live="${model.ariaLive}"><strong>${model.label}</strong><span>${model.message}</span></p>\n  <p class="assignment-history-next-action"><strong>Next action</strong><span>${model.nextAction}</span></p>\n  <button class="assignment-history-action" type="button"${disabled}>${model.actionLabel}</button>\n</section>`;
+}

apps/hr-workspace/assignment-history-state.stories.js

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+import { assignmentHistoryStateMarkup } from './assignment-history-state.js';
+import './assignment-history-state.css';
+
+export default {
+  title: 'HR Workspace/Assignment History States',
+  parameters: {
+    design: {
+      type: 'figma',
+      url: 'Orgmetra Baseline — Storybook Inventory node 1:64',
+    },
+  },
+};
+
+function story(state) {
+  return () => assignmentHistoryStateMarkup(state);
+}
+
+export const Idle = story('idle');
+export const Loading = story('loading');
+export const ReadyReadOnly = story('ready');
+export const Empty = story('empty');
+export const PermissionDenied = story('denied');
+export const StaleEvidence = story('stale');
+export const ScopeBlocked = story('scopeBlocked');
+export const Error = story('error');

docs/doctoring/hr-workspace-assignment-history-accessibility-references.md

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+# HR Workspace Assignment History accessibility references
+
+Reviewed: 2026-08-28 (Asia/Seoul)
+
+This note records design inputs for the active Assignment-history interaction slice. It is evidence for engineering decisions, not a claim of accessibility certification or legal compliance.
+
+## Primary standards
+
+World Wide Web Consortium. (2024, December 12). *Web Content Accessibility Guidelines (WCAG) 2.2*. https://www.w3.org/TR/WCAG22/
+
+World Wide Web Consortium. (2023, June 6). *Accessible Rich Internet Applications (WAI-ARIA) 1.2*. https://www.w3.org/TR/wai-aria-1.2/
+
+World Wide Web Consortium. (2025, October 21). *Web Content Accessibility Guidelines (WCAG) 2.2 approved as ISO/IEC international standard*. https://www.w3.org/press-releases/2025/wcag22-iso-pas/
+
+## Applied consequences
+
+- Loading is perceivable through `aria-busy=true`, and transient status updates use a polite live region.
+- Permission, stale-evidence, field-scope, and transport failures use assertive alert semantics and provide a concrete next action.
+- Keyboard focus remains visible through the existing Orgmetra focus token; actionable controls preserve a 44px minimum target height.
+- Loaded Assignment history remains explicitly read-only. UI evidence does not grant Assignment mutation authority or consequential employment-decision authority.
+- Empty and stale states prohibit inference beyond the exact authorized business-time and system-knowledge coordinate.
+- Figma `Orgmetra Baseline` Storybook Inventory node `1:64` was freshly re-read on 2026-08-28 and continues to require default, hover, focus, disabled, loading, validation-error, read-only, and high-risk-confirmation interaction states. This slice reuses that design system rather than introducing parallel geometry or tokens.

docs/traceability/hr-workspace-assignment-history-state.md

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+# HR Workspace Assignment History interaction traceability
+
+Status: **active PR only; not protected-main truth**.
+
+## Buyer need
+
+The PRD identifies Employee Profile with bitemporal Assignment history as a P1 HRIS surface. A customer needs to understand what Assignment evidence was effective and what Orgmetra knew at a selected system-knowledge coordinate without converting that read into mutation authority or leaking fields outside the authorized HR purpose.
+
+## Ownership boundary
+
+- PR #142 owns the separate purpose-bound People API Assignment-history read contract. Its active-PR backend evidence does not transfer into this UI lane.
+- PR #130 owns the shared protected-read accessibility semantics and Figma/Storybook interaction system.
+- This child owns **presentation/interaction only** for Assignment history. It introduces no Assignment writer, no cross-service SQL, and no dedicated-writer dependency mutation.
+
+## Governed interaction evidence
+
+`apps/hr-workspace/assignment-history-state.js` exposes only constant, value-minimized state semantics for `idle`, `loading`, `ready`, `empty`, `denied`, `stale`, `scopeBlocked`, and `error`.
+
+The `ready` state explains the bitemporal distinction: effective time is when the Assignment fact applied; system-recorded time is when Orgmetra knew it. The state is read-only and cannot authorize Assignment mutation. `empty`, `stale`, and failure states prohibit inference outside the exact authorized business-time and known-at coordinate.
+
+The view model intentionally carries no Person, Employment, Assignment, Job, Position, or Organization identifiers; worker names/contact data; compensation, rating, assessment, or candidate values; credentials/tokens; prompts; or model output. Actual authorized HR values remain backend response data and must be handled through purpose-bound field authorization rather than embedded in generic UI-state evidence.
+
+## Design and accessibility evidence
+
+Figma `Orgmetra Baseline` Storybook Inventory node `1:64` was freshly re-read on 2026-08-28. The executable Storybook stories correlate to that node and reuse existing Orgmetra CSS tokens, visible `:focus-visible` treatment, loading semantics, read-only presentation, failure alerts, and 44px action target sizing. Current W3C WCAG 2.2 and WAI-ARIA 1.2 references are recorded under `docs/doctoring/hr-workspace-assignment-history-accessibility-references.md`.
+
+## Executable acceptance
+
+`tests/hr-workspace-assignment-history-state.test.mjs` requires:
+
+- the full bounded state set and concrete next actions;
+- read-only bitemporal explanation without mutation authority;
+- no unsafe inference from empty/stale/scope-blocked/error states;
+- exact built-in string state names and rejection of prototype-inherited names such as `constructor`, `toString`, and `__proto__`;
+- Figma node correlation, Storybook inventory, existing focus/design tokens, loading/read-only/failure CSS states, and 44px action target; and
+- exact 100% owned line, branch, and function coverage in the dedicated workflow.
+
+After #53 and #130 integrate dependency-first, this child must be retargeted to fresh `develop`, reconciled with then-current Employee Profile and #142 backend truth, and rerun through applicable browser/accessibility/Foundation/Recovery/SAST/Security and central required workflows. No parent or predecessor check/review transfers.