fix(scorecard): drop archived polystack target, add boj-server-cartridges (#344)

## Summary

`polystack` was archived during the 2026-05-26 cartridge-extraction
initiative — its 11 LSP halves migrated into the new
`hyperpolymath/boj-server-cartridges` repo (boj-server-cartridges PRs
#1-#8, all merged). The scorecard target manifest still pointed at the
archived repo, causing every scan run to skip the target silently.

This replaces the stale `polystack` entry with the migration target
`boj-server-cartridges` (placed alphabetically adjacent to the existing
`boj-server` entry).

## Diff

```diff
   {"local": "boj-server", "github": "hyperpolymath/boj-server"},
+  {"local": "boj-server-cartridges", "github": "hyperpolymath/boj-server-cartridges"},
 ...
-  {"local": "polystack", "github": "hyperpolymath/polystack"},
```

Per
`boj-server-cartridges/docs/handover/2026-05-26/prompts/earlier-03-hypatia-scorecard-polystack-ref.adoc`.

## Test plan

- [x] `jq .` validates the JSON.
- [x] `git grep polystack -- '*.json'` shows zero remaining hits.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

data/verisim/dispatch/scorecard-target-manifest.json

@@ -28,6 +28,7 @@
   {"local": "bofig", "github": "hyperpolymath/bofig"},
   {"local": "boinc-boinc", "github": "hyperpolymath/boinc-boinc"},
   {"local": "boj-server", "github": "hyperpolymath/boj-server"},
+  {"local": "boj-server-cartridges", "github": "hyperpolymath/boj-server-cartridges"},
   {"local": "BowtieRisk.jl", "github": "hyperpolymath/BowtieRisk.jl"},
   {"local": "bqniser", "github": "hyperpolymath/bqniser"},
   {"local": "branch-newspaper", "github": "hyperpolymath/branch-newspaper"},
@@ -156,7 +157,6 @@
   {"local": "PolyglotFormalisms.jl", "github": "hyperpolymath/PolyglotFormalisms.jl"},
   {"local": "polyglot-i18n", "github": "hyperpolymath/polyglot-i18n"},
   {"local": "polysafe-gitfixer", "github": "hyperpolymath/polysafe-gitfixer"},
-  {"local": "polystack", "github": "hyperpolymath/polystack"},
   {"local": "ponyiser", "github": "hyperpolymath/ponyiser"},
   {"local": "PostDisciplinary.jl", "github": "hyperpolymath/PostDisciplinary.jl"},
   {"local": "PRComms.jl", "github": "hyperpolymath/PRComms.jl"},