chore(plugins): delete the superseded fusion-plugin-even-cards (#2790) (#2988)

Closes #2790 by finishing a decision that was already made and written
down.

## The issue's premise was wrong, including as I filed it

I raised this as "a package accidentally missing from
`pnpm-workspace.yaml`." It wasn't. `CHANGELOG-archive.md:9596`:

> Consolidate Even Realities plugin support into
`fusion-plugin-even-realities-glasses` and **remove
`fusion-plugin-even-cards` from the active workspace package list to
avoid duplicate user-facing integrations.**

The removal was deliberate, for a stated reason. The directory is what
got left behind. That also rules out the option I had been weighting
first — adding it back would undo a shipped consolidation and re-create
the duplicate integration it was removed to prevent.

## Unreachable by every path

| check | result |
|---|---|
| `pnpm-workspace.yaml` globs | no — never installed or built |
| CLI bundle list (`packages/cli/tsup.config.ts`) | no — 0 mentions,
while seven other plugins are named |
| runtime `plugins/*` directory-scan discovery | none exists — plugins
are enumerated explicitly |
| `package.json` | `private: true` — never published |
| imports outside its own directory | none |
| kept as a docs/authoring example | no — zero references in `docs/` or
any root `*.md` |
| successor in the workspace | yes —
`fusion-plugin-even-realities-glasses` |

## It was also polluting two ratchets

Dead code in a scanned tree is worse than dead code: both censuses are
**source-text scanners**, so they counted debt in files no build or
typecheck covers. Nobody could retire those entries through a
normally-verified refactor, and they inflated how much of the remaining
debt looked actionable.

Both baselines regenerated, and I checked each diff rather than trusting
the totals:

| baseline | change |
|---|---|
| `lane-wiring` | 26 → 23 sites, 21 → 20 files — **one entry removed**,
`board-routes.ts: 3` |
| `lifecycle-column-census` | exactly its two `board-cards.ts` entries |

Neither regeneration tightened anything unrelated — worth confirming
explicitly, because `lifecycle-column-census.mjs --strict` **writes**
its baseline as a side effect and could have folded an unrelated drop
into this commit.

**Verified:** lane-wiring, SQL-literal and FNXC gates all exit 0 after
the deletion; lint clean. 15 files removed.

## Why I went ahead

I said twice I would not delete this unilaterally. What changed is that
the trade-off dissolved — once the consolidation decision turned out to
be documented and the "is it a teaching example?" question answered by a
docs grep, there was nothing left to decide, only to execute. The
deletion is git-reversible and the standing guidance is that reversible
calls are mine to make.

Fourth time today a thing I filed as "needs someone else's judgement"
turned out to have its answer already in the repository. Cheap habit
worth keeping: before deferring, grep for whether the judgement has
already been made.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/lib/lane-wiring-baseline.json

@@ -19,7 +19,6 @@
     "packages/cli/src/commands/dashboard-tui/bucket-mapping.ts": 1,
     "packages/cli/src/extension.ts": 1,
     "plugins/fusion-plugin-dependency-graph/src/GraphTaskNode.tsx": 1,
-    "plugins/fusion-plugin-even-cards/src/routes/board-routes.ts": 3,
     "plugins/fusion-plugin-even-realities-glasses/src/routes/board-routes.ts": 1
   }
 }

scripts/lib/lifecycle-column-census-baseline.json

@@ -127,8 +127,6 @@
     "packages/engine/src/scheduler.ts\u0000todo": 1,
     "packages/engine/src/self-healing.ts\u0000archived": 1,
     "packages/engine/src/triage.ts\u0000triage": 1,
-    "plugins/fusion-plugin-even-cards/src/cards/board-cards.ts\u0000archived": 1,
-    "plugins/fusion-plugin-even-cards/src/cards/board-cards.ts\u0000done": 1,
     "plugins/fusion-plugin-even-realities-glasses/src/notifications/diff.ts\u0000done": 1,
     "plugins/fusion-plugin-reports/src/store/report-types.ts\u0000archived": 1
   },