Stacked on #2474. Base is `feature/workflow-vocabulary-u4-dead-code` —
do not merge before it.
Deletes an **entire feature that has never executed in production**, and
reverts `5a2de7d`, which only threaded resolved lifecycle columns
through it.
## Reachability evidence — the whole basis for this
```
surfaceDependencyBlockedTodos ← in NEITHER sweep registry; no caller in
└─ getDependencyBlockedTodoReporter() engine/dashboard/cli — only tests
└─ engine/dependency-blocked-todo-reporter.ts ← sole caller of ↓
└─ core/computeDependencyBlockedTodoReport
```
self-healing owns two name-based sweep registries (`runStartupRecovery`,
58 entries; `runMaintenance`, 76). `surfaceDependencyBlockedTodos` is in
**neither**, so nothing ever invoked the chain below it. Its four tests
passed while proving nothing about production.
## Why delete rather than wire it up
Wiring was the tempting option and is the riskier one. Switching on a
450-line path that has never run — whose tests therefore establish
nothing about its behavior against real data — is a **behavior change
with unquantified blast radius**. This program already refused exactly
that move for the **pool-id sentinel**, a one-line change that would
switch on dormant enforcement across every project. This is the same
class of move at ~450× the size.
Deleting is also the recoverable direction: git keeps the feature, and
it can be resurrected deliberately — with tests that prove it *runs* —
if dependency-blocked reporting is actually wanted.
## The settings keys go with it
`dependencyBlockedTodoReportEnabled` defaulted `true` while driving
nothing. A schema/API-visible switch that lies about what the system
does is worse than no switch. (It had no dashboard UI field — the
dashboard test allowlist already recorded it as *"no UI field"*.) Four
sibling tuning keys are removed with it.
## Against my own earlier work
`5a2de7d` threaded resolved lifecycle roles into
`computeDependencyBlockedTodoReport` and its reporter, answering a
review finding I confirmed as real. **The code was correct; the impact
claim was not**, because the path never executes. Neither the reviewer
nor I checked *reachability* before agreeing the defect mattered — only
correctness. A correction is posted on that thread in #2470.
**Scope limit on that admission:** the same finding also described
*incorrect scheduler ordering*. That half runs through
`buildUnblockWeightMap` in `task-priority.ts`, which is **live** and was
already threading `terminalColumns` (B1, `434b385`). Scheduler ordering
was never affected, before or after.
## What survives
`blocker-fanout.ts` **stays** — it is live via `task-priority.ts`. Only
the plural `holdColumns` option added by `5a2de7d` is reverted, since
the deleted report was its sole consumer. `holdColumn` (singular, from
B1) remains.
## Net
**1,244 deletions / 5 insertions across 15 files** — ~450 production
lines, ~684 test lines, 5 settings keys.
## Verification
- `tsc --noEmit` clean in **core, engine, and dashboard-app**; `pnpm
lint` clean
- merge gate green (299 + 10 + 71)
- self-healing suite: 411 passed, 1 **pre-existing** failure
(`archiveStaleDoneTasks`)
- dashboard settings-descriptions suite green
- `settings-parity.test.ts` has one **pre-existing** failure
(`agentToolOutputMaxChars` overlap) that fails identically with these
changes stashed — unrelated to this deletion
No changeset: `@fusion/core` and `@fusion/engine` are private.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added quiet-window backlog health diagnostics for stalled items in
review, with repeat-alert suppression.
* Added default thresholds for backlog-pressure alerts.
* **Changes**
* Removed dependency-blocked todo reporting and related alerts.
* Removed the dependency-blocked todo enable/disable setting; remaining
tuning options are no longer active.
* Updated the workflow hold classification to use a single todo column.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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