fix(portals): keep hidden markup and invisible characters out of CLI output

Every portal CLI turned HTML into text with a bare tag strip, so the
text inside comments, <style>/<script> blocks and hidden or
display:none elements came out as visible text. Unicode tag
characters, bidi controls and zero-width characters passed through
untouched, raw from the portal's JSON or decoded from numeric
entities. A listing could carry an instruction that renders as nothing
on the page but reads as text to the model.

Each CLI now runs HTML through visibleHtml, extending the helper
jobindex already used for one of its page shapes, and strips invisible
characters at the one function every output format reads. The
/add-portal contract names both, with linkedin-search as the copy
source.

Each CLI's tests/hidden-text.test.ts drives the real path (the CLI in
a fresh process, the command handler, or the normalizer the handler
calls) and fails on master.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/jobnet-search/cli/src/commands/detail.ts

@@ -1,6 +1,6 @@
 import { defineCommand, option } from "@bunli/core"
 import { z } from "zod"
-import { apiFetch, normalizeJobId, writeError, stripHtml } from "../helpers.js"
+import { apiFetch, normalizeJobId, writeError, stripHtml, stripInvisible, visibleHtml } from "../helpers.js"
 import type { JobAdRaw, SearchApiResponse } from "./search.js"
 
 export interface DetailApiResponse {
@@ -132,13 +132,18 @@ export function mapSearchAdToDetail(raw: JobAdRaw & { jobAdUrl?: string | null;
  * The search command already maps that sentinel to null; detail must agree,
  * or an undisclosed deadline reads as 126 years expired and /rank's expiry
  * sweep retires the job the moment it is stored.
+ *
+ * The body is the employer's HTML: markup a browser never renders is dropped,
+ * and invisible characters are stripped from every field (see visibleHtml and
+ * stripInvisible).
  */
 export function prepareDetail(data: DetailApiResponse): DetailApiResponse {
   const deadline = data.application.deadlineDate
   if (deadline && deadline.startsWith("1900-01-01")) {
     data.application.deadlineDate = null
   }
-  return data
+  if (typeof data.body === "string") data.body = visibleHtml(data.body)
+  return stripInvisible(data)
 }
 
 export const detail = defineCommand({

.agents/skills/jobnet-search/cli/src/commands/search.ts

@@ -1,6 +1,6 @@
 import { defineCommand, option } from "@bunli/core"
 import { z } from "zod"
-import { apiFetch, writeError } from "../helpers.js"
+import { apiFetch, stripInvisible, writeError } from "../helpers.js"
 
 export interface SearchApiResponse {
   jobAds: JobAdRaw[]
@@ -175,7 +175,7 @@ export function createSearchOutput(data: SearchApiResponse, flags: SearchFlags)
     searchString: data.searchString ?? null,
   }
 
-  return { meta, facets, results }
+  return stripInvisible({ meta, facets, results })
 }
 
 export const search = defineCommand({

.agents/skills/jobnet-search/cli/src/helpers.ts

@@ -43,8 +43,92 @@ export function writeError(error: string, code: string): void {
   process.stderr.write(JSON.stringify({ error, code }) + "\n")
 }
 
+/**
+ * Characters a reader of the posting never sees but a model reading this
+ * output does: C0/C1 controls other than tab, newline and carriage return, the
+ * soft hyphen, bidi marks/embeddings/overrides/isolates, zero-width characters
+ * and invisible operators, the BOM, variation selectors, and Unicode tag
+ * characters (U+E0000-E007F), which can spell out a whole hidden instruction.
+ * Listing text is third-party data, and these arrive raw in a portal's JSON or
+ * markup as easily as through a numeric entity.
+ */
+const INVISIBLE_CHARS =
+  /[\u0000-\u0008\u000B\u000C\u000E-\u001F\u007F-\u009F­؜᠎​-‏‪-‮⁠-︀-️\u{E0000}-\u{E007F}\u{E0100}-\u{E01EF}]/gu
+
+/** Strip INVISIBLE_CHARS from every string in a result, recursively: the CLI's output boundary. */
+export function stripInvisible<T>(value: T): T {
+  if (typeof value === "string") return value.replace(INVISIBLE_CHARS, "") as T
+  if (Array.isArray(value)) return value.map(stripInvisible) as T
+  if (value !== null && typeof value === "object" && Object.getPrototypeOf(value) === Object.prototype) {
+    return Object.fromEntries(Object.entries(value).map(([k, v]) => [k, stripInvisible(v)])) as T
+  }
+  return value
+}
+
+const VOID_TAGS = new Set(["area", "base", "br", "col", "embed", "hr", "img", "input", "link", "meta", "source", "track", "wbr"])
+
+/** Whether an opening tag's attributes keep it from rendering: `hidden`, or an inline style that hides it. */
+function isHiddenTag(attrs: string): boolean {
+  for (const m of attrs.matchAll(/([^\s"'=/>]+)(?:\s*=\s*(?:"([^"]*)"|'([^']*)'|([^\s"'>]+)))?/g)) {
+    const name = m[1].toLowerCase()
+    const value = m[2] ?? m[3] ?? m[4] ?? ""
+    if (name === "hidden") return true
+    if (name === "style" && /(?:^|;)\s*(?:display\s*:\s*none|visibility\s*:\s*hidden|mso-hide\s*:\s*all)\b/i.test(value)) {
+      return true
+    }
+  }
+  return false
+}
+
+/**
+ * Drop markup a browser never renders - comments (including Word's
+ * conditional ones), <script>/<style>/<template> blocks, and elements marked
+ * hidden - before tags are stripped. A plain tag strip keeps their text, which
+ * hands the model words the posting's reader never saw. CSS-only tricks
+ * (off-screen, zero font size) need a renderer and are not caught here.
+ */
+export function visibleHtml(html: string): string {
+  const src = html
+    .replace(/<!--[\s\S]*?(?:-->|$)/g, "")
+    .replace(/<(script|style|template)\b[^>]*>[\s\S]*?(?:<\/\1\s*>|$)/gi, "")
+  // One pass, collecting what is kept: slicing the string per hidden element
+  // would make a page full of them quadratic.
+  const open = /<([a-zA-Z][a-zA-Z0-9-]*)(\s[^>]*)?>/g
+  const kept: string[] = []
+  let from = 0
+  let m: RegExpExecArray | null
+  while ((m = open.exec(src)) !== null) {
+    if (!m[2] || !isHiddenTag(m[2])) continue
+    const tag = m[1].toLowerCase()
+    let end = open.lastIndex
+    if (!VOID_TAGS.has(tag) && !m[0].endsWith("/>")) {
+      // Skip to the matching close tag, counting nested same-name elements. An
+      // unclosed hidden element runs to the end: failing closed drops visible
+      // text, failing open would leak the hidden text.
+      const same = new RegExp(`<(/?)${tag}\\b[^>]*>`, "gi")
+      same.lastIndex = end
+      end = src.length
+      let depth = 1
+      let s: RegExpExecArray | null
+      while ((s = same.exec(src)) !== null) {
+        if (s[1]) depth--
+        else if (!s[0].endsWith("/>")) depth++
+        if (depth === 0) {
+          end = same.lastIndex
+          break
+        }
+      }
+    }
+    kept.push(src.slice(from, m.index))
+    from = end
+    open.lastIndex = end
+  }
+  kept.push(src.slice(from))
+  return kept.join("")
+}
+
 export function stripHtml(html: string): string {
-  return html
+  return visibleHtml(html)
     .replace(/<[^>]*>/g, " ")
     .replace(/&amp;/g, "&")
     .replace(/&lt;/g, "<")