Release v0.27.0: security hardening (audit 0026)

Remediates the rfc-app application + deploy-config findings from the
Session 0026 security audit. Cut as the "v0.25.0-security-hardening"
branch (from v0.24.0); reversioned to 0.27.0 on rebase onto main since
v0.26.0 (#28) shipped while this was in flight.

- C1 (Critical): single sanitizeHtml.js chokepoint (DOMPurify) for every
  marked→innerHTML / dangerouslySetInnerHTML sink (MarkdownPreview,
  ProposalView x2, Editor); rel=noopener hook on target=_blank links.
- H1: per-account OTC-verify lockout (migration 023, auto-applied) +
  per-IP throttle via new ratelimit.py; wired on otc verify/request +
  passcode check/verify.
- M1: device_trust.lookup() single indexed-row read — cookie value is now
  "<row_id>.<raw_token>"; bcrypt-checks one row, not a global table scan.
  (Behavior change: existing device-trust cookies re-prompt once.)
- M2: HTTP security headers (CSP/HSTS/XFO/XCTO/Referrer-Policy) at nginx.
- M4: session cookie Secure-by-default (SESSION_COOKIE_SECURE opt-out).
- M5: bounce webhook fails CLOSED (503) when secret unset, instead of open;
  RFC_APP_INSECURE_BOUNCE_WEBHOOK=1 dev opt-in.
- L2/L3: per-IP cooldown + check-endpoint throttle.
- L4: systemd sandbox knobs. L8/I1: nginx server_tokens off + TLS1.0/1.1 out.

VERSION + frontend/package.json → 0.27.0; CHANGELOG documents the upgrade
steps (incl. the out-of-band nginx + systemd apply, which the flotilla
deploy gesture does not perform).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/ProposalView.jsx

@@ -10,7 +10,7 @@
 
 import { useEffect, useState } from 'react'
 import { useParams, useNavigate } from 'react-router-dom'
-import { marked } from 'marked'
+import { renderMarkdown } from '../lib/sanitizeHtml'
 import { getProposal, mergeProposal, declineProposal, withdrawProposal } from '../api'
 
 export default function ProposalView({ viewer, onChange }) {
@@ -161,7 +161,7 @@ export default function ProposalView({ viewer, onChange }) {
       </h3>
       <div
         className="entry-body"
-        dangerouslySetInnerHTML={{ __html: marked.parse(data.entry?.body || '') }}
+        dangerouslySetInnerHTML={{ __html: renderMarkdown(data.entry?.body || '') }}
       />
 
       {/* #26: the optional ground-truth use case the proposer supplied. */}
@@ -169,7 +169,7 @@ export default function ProposalView({ viewer, onChange }) {
         Intended use case
       </h3>
       {data.proposed_use_case
-        ? <div className="entry-body" dangerouslySetInnerHTML={{ __html: marked.parse(data.proposed_use_case) }} />
+        ? <div className="entry-body" dangerouslySetInnerHTML={{ __html: renderMarkdown(data.proposed_use_case) }} />
         : <p style={{ color: '#999', fontStyle: 'italic' }}>Left blank by the proposer.</p>}
     </article>
   )