feat(web): add historical user deletion backfill

[eshurakov]

Summary

• Add an admin-only Historical user IDs form with bounded preview/submit batches, eligibility revalidation, and idempotent queue receipts for retained soft-deleted accounts.
• Introduce ID-only catalog V3 with KiloClaw, CLI v1/v2, usage-prompt, PostHog, and anonymization tasks. Ordinary requests remain on V2; no customer notifications or email-based provider discovery are included in V3.
• Match PostHog persons by the exact case-sensitive user ID, fail closed on incomplete lookups, and reuse durable deletion checkpoints.
• Preserve original deletion timestamps during anonymization replay and avoid creating tombstones for synthetic deleted addresses.

Verification

• Local manual E2E

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.test.ts
• apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.tsx

Previous Review Summaries (2 snapshots, latest commit d739014)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit d739014)

Status: 1 Issue Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.tsx	208	Confirm toast treats preview refusals as queue failures

Files Reviewed (2 files)

• apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.test.ts - 0 issues
• apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.tsx - 1 issue

Fix these issues in Kilo Cloud

Previous review (commit 27b8293)

Status: 1 Issue Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.tsx	180	Confirm toast treats preview refusals as queue failures

Files Reviewed (18 files)

• apps/web/src/app/admin/deletion-queue/DeletionQueueContent.tsx - 0 issues
• apps/web/src/app/admin/deletion-queue/HistoricalUserIdsForm.tsx - 1 issue
• apps/web/src/app/admin/deletion-queue/[id]/DeletionQueueDetailContent.tsx - 0 issues
• apps/web/src/app/admin/deletion-queue/deletion-queue-format.test.ts - 0 issues
• apps/web/src/app/admin/deletion-queue/deletion-queue-format.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-catalog.test.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-catalog.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-constants.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-hints.test.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-hints.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-legacy-backfill.test.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/deletion-legacy-backfill.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/handlers/posthog.test.ts - 0 issues
• apps/web/src/lib/user/deletion-queue/handlers/posthog.ts - 0 issues
• apps/web/src/lib/user/index.test.ts - 0 issues
• apps/web/src/lib/user/index.ts - 0 issues
• apps/web/src/routers/admin/user-deletion-queue-router.test.ts - 0 issues
• apps/web/src/routers/admin/user-deletion-queue-router.ts - 0 issues

Fix these issues in Kilo Cloud

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_{Reviewed by grok-4.6 · Input: 81.4K · Output: 4.8K · Cached: 176.3K}

_{Review guidance: REVIEW.md from base branch main}