revert: remove the placement reconciler — it manufactured the problem it solved

Milestone #421 built a sweep that compared each image's `artist_id` to the
name of the directory holding its file, and called every mismatch a misplaced
image. It reported 33,789 of 63,605 as wrongly filed. That number described
the comparison, not the library.

What it actually was:

  32,475  (97.1%)  one artist's own folder, spelled differently
                   — Telepurte/ vs telepurte/. Same artist, same art.
     657  ( 2.0%)  loose at the images root
     328  ( 1.0%)  in a folder named after a different artist

And the 1% did not mean what the tool assumed either. `ImageProvenance`
records the post and source every file was downloaded from — the
authoritative answer, which the tool never consulted. Querying it for all 328:

    144  provenance agrees with the record  (move would be right)
     87  provenance agrees with the FOLDER  (the record is wrong; move wrong)
     53  provenance names SEVERAL artists   (no single correct folder)
     41  no provenance at all
      3  agrees with neither

So the sweep would have misfiled or arbitrarily picked for ~41% of the only
set it was really needed for. The system already knew where each file came
from; the tool inferred it from a column and a directory name instead.

Operator, 2026-09-21: *"the current system consistently records where items
are and where they came from this is just complicating something works and
doesn't need fixing."* Correct on both counts.

Removed: the service, the tasks, the model and migration 0099's table, the
/api/cleanup/layout and /placement/* endpoints, the Maintenance card and its
store actions, and the tests. 0100 drops the table (rule #22 — no legacy).

KEPT deliberately, per the operator:
- `utils.paths.canonical_subdir` — new filesystem imports derive their
  directory from the artist's slug, matching what the downloader always did.
  Not part of this tool; removing it would be churn that fixes nothing.
- The 327 files run 1 moved (InsoUwu/ -> insouwu/). Same artist either way,
  and the gallery renders them correctly.
- Everything from #4223 (three-gate dedup, 256-bit pHash) and #4234 (backup
  credential exclusion). Those fixed problems that were actually reported.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR

frontend/test/placement.spec.js

@@ -1,111 +0,0 @@
-import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
-import { setActivePinia, createPinia } from 'pinia'
-import { useCleanupStore } from '../src/stores/cleanup.js'
-import { stubFetch } from './stubFetch.js'
-
-
-describe('placement reconciler store (milestone #421)', () => {
-  beforeEach(() => setActivePinia(createPinia()))
-  afterEach(() => vi.restoreAllMocks())
-
-  it('loadLayout leaves the disk check off by default', async () => {
-    const s = useCleanupStore()
-    let seen = ''
-    stubFetch((url) => {
-      seen = url
-      return { status: 200, body: { total_rows: 10, misplaced_rows: 2, artists: [] } }
-    })
-    await s.loadLayout()
-    // One stat per misplaced row over NFS is the cost; it must be opt-in.
-    expect(seen).not.toContain('check_disk')
-    expect(s.layout.misplaced_rows).toBe(2)
-  })
-
-  it('loadLayout asks for the disk check when requested', async () => {
-    const s = useCleanupStore()
-    let seen = ''
-    stubFetch((url) => {
-      seen = url
-      return { status: 200, body: { total_rows: 0, misplaced_rows: 0, artists: [] } }
-    })
-    await s.loadLayout(true)
-    expect(seen).toContain('check_disk=1')
-  })
-
-  it('planPlacement scopes to an artist when given one', async () => {
-    const s = useCleanupStore()
-    let sent = null
-    stubFetch((url, init) => {
-      sent = JSON.parse(init.body)
-      return { status: 202, body: { status: 'dispatched' } }
-    })
-    await s.planPlacement(47)
-    expect(sent).toEqual({ artist_id: 47 })
-  })
-
-  it('planPlacement sends no scope for the whole library', async () => {
-    const s = useCleanupStore()
-    let sent = null
-    stubFetch((url, init) => {
-      sent = JSON.parse(init.body)
-      return { status: 202, body: { status: 'dispatched' } }
-    })
-    await s.planPlacement()
-    // Not `{artist_id: null}` — the endpoint rejects a non-integer, and an
-    // absent key is how "whole library" is spelled.
-    expect(sent).toEqual({})
-  })
-
-  it('loadPlacementRuns keeps the rows for the table', async () => {
-    const s = useCleanupStore()
-    stubFetch(() => ({
-      status: 200,
-      body: { runs: [{ id: 3, status: 'ready', planned_count: 12 }] },
-    }))
-    await s.loadPlacementRuns()
-    expect(s.placementRuns).toHaveLength(1)
-    expect(s.placementRuns[0].status).toBe('ready')
-  })
-
-  it('getPlacementRun carries the moves — it is the preview', async () => {
-    const s = useCleanupStore()
-    stubFetch(() => ({
-      status: 200,
-      body: {
-        id: 3, status: 'ready', planned_count: 1,
-        moves: [{ image_id: 9, from: '/images/Conto/x.png', to: '/images/conto/x.png' }],
-      },
-    }))
-    const run = await s.getPlacementRun(3)
-    expect(run.moves[0].from).toBe('/images/Conto/x.png')
-    expect(run.moves[0].to).toBe('/images/conto/x.png')
-  })
-
-  it('loadArtistNames maps id to name for the run rows', async () => {
-    const s = useCleanupStore()
-    stubFetch(() => ({
-      status: 200,
-      body: [{ id: 47, name: 'Conto', slug: 'conto' }],
-    }))
-    expect(await s.loadArtistNames()).toEqual({ 47: 'Conto' })
-  })
-
-  it('loadArtistNames survives an empty roster', async () => {
-    const s = useCleanupStore()
-    stubFetch(() => ({ status: 200, body: [] }))
-    expect(await s.loadArtistNames()).toEqual({})
-  })
-
-  it('applyPlacement and revertPlacement post to their own run', async () => {
-    const s = useCleanupStore()
-    const urls = []
-    stubFetch((url) => {
-      urls.push(url)
-      return { status: 202, body: { status: 'dispatched' } }
-    })
-    await s.applyPlacement(5)
-    await s.revertPlacement(5)
-    expect(urls[0]).toContain('/api/cleanup/placement/runs/5/apply')
-    expect(urls[1]).toContain('/api/cleanup/placement/runs/5/revert')
-  })
-})

frontend/test/stubFetch.js

@@ -1,24 +0,0 @@
-import { vi } from 'vitest'
-
-// The canonical fetch stub for store specs.
-//
-// `handler(url, init)` returns `{ status, body }`; body is JSON-encoded, and
-// `ok` is derived from the status so a store's error path can be exercised by
-// returning 4xx/5xx. Returns the vi.fn so a caller can assert on calls.
-//
-// Extracted 2026-09-21 from six specs carrying byte-identical copies
-// (adminStore, credentials, dbMaintenance, gallery, suggestions,
-// galleryRelatedStrip). Those still hold their own; migrate each the next
-// time it is touched rather than in one sweep.
-export function stubFetch (handler) {
-  globalThis.fetch = vi.fn(async (url, init) => {
-    const { status, body } = handler(url, init)
-    return {
-      ok: status >= 200 && status < 300,
-      status,
-      statusText: String(status),
-      text: async () => (body == null ? '' : JSON.stringify(body)),
-    }
-  })
-  return globalThis.fetch
-}