feat(realism): wire fingerprint_html/svg through taxonomy + UI

The two new fingerprint canary generators existed at the API level
since f64e78f but weren't visible to the realism engine or the
operator-facing dashboard. Threads them through every place that
enumerates canary content classes.

Backend:
* realism/taxonomy.py - two new ContentClass members
  (CANARY_FINGERPRINT_HTML, CANARY_FINGERPRINT_SVG); enum is
  wire-visible (synthetic_files.content_class column + bus discrim)
  so we add at the bottom, never reorder.
* canary/cultivator.py - class-to-generator dispatch, kind mapping
  (both http), and default placement paths
  (~/Documents/asset_directory.html and network_topology.svg).
* realism/naming.py + bodies.py - _name_canary / _body_canary entries.
* realism/planner.py - added to _DEFAULT_CANARY_CLASS_WEIGHTS and
  the _CANARY_CLASSES classification set.

Frontend:
* decnet_web/src/realism/labels.ts - display labels.
* decnet_web/src/components/RealismConfig/RealismConfig.tsx - default
  canary weight rows so operators see them in the realism config UI.
* decnet_web/src/components/SyntheticFiles/SyntheticFiles.tsx - added
  to the CONTENT_CLASSES allow-list so filter dropdowns show them.

Also: re-applied the nosec B404/B603 markers on canary/obfuscator.py;
the first commit's pre-commit autoformatter stripped them.

Tests: extended tests/realism/test_taxonomy.py's stability assertion
to include the two new values. Full canary + realism suites pass
(362 / 2 skipped).

decnet/canary/cultivator.py

@@ -46,6 +46,8 @@ _CLASS_TO_GENERATOR: dict[ContentClass, str] = {
     ContentClass.CANARY_HONEYDOC_DOCX: "honeydoc_docx",
     ContentClass.CANARY_HONEYDOC_PDF: "honeydoc_pdf",
     ContentClass.CANARY_MYSQL_DUMP: "mysql_dump",
+    ContentClass.CANARY_FINGERPRINT_HTML: "fingerprint_html",
+    ContentClass.CANARY_FINGERPRINT_SVG: "fingerprint_svg",
 }
 
 
@@ -62,6 +64,8 @@ _GENERATOR_TO_KIND: dict[str, str] = {
     "honeydoc_pdf": "http",
     "ssh_key": "dns",             # trip is DNS resolution of host comment
     "mysql_dump": "dns",          # trip is DNS resolution of subdomain
+    "fingerprint_html": "http",   # obfuscated JS beacons GET /c/<slug>
+    "fingerprint_svg": "http",    # same, embedded inside SVG <script>
 }
 
 
@@ -78,6 +82,8 @@ _DEFAULT_PATH: dict[ContentClass, str] = {
     ContentClass.CANARY_HONEYDOC_DOCX: "/home/{persona}/Documents/Q3-Operations-Review.docx",
     ContentClass.CANARY_HONEYDOC_PDF: "/home/{persona}/Documents/Q3-Operations-Review.pdf",
     ContentClass.CANARY_MYSQL_DUMP: "/var/backups/db_backup.sql",
+    ContentClass.CANARY_FINGERPRINT_HTML: "/home/{persona}/Documents/asset_directory.html",
+    ContentClass.CANARY_FINGERPRINT_SVG: "/home/{persona}/Documents/network_topology.svg",
 }