docs: archive the finished backlogs (RD-30)

Two backlog trees are complete: `docs/project/backlog/` (75 files, every
WP done) and `docs/project/refactor-backlog-setup/` (the arc before it).
Move both under `docs/project/archive/` with `git mv`, so history stays
intact through `git log --follow`. `SHOWCASE-ROADMAP.md` moves with them,
because it points at the now-archived backlog README.

Add `docs/project/archive/README.md`. It states that these trees are
historical and names the two directories that are still live.

Repoint every inbound reference named in RD-30's Files table: CLAUDE.md,
the root README, both backend READMEs, `LetterHtml.cs`, `a11y.mdx`, the
`document-feature` and `new-ssp` skills, and the readable-codebase PLAN,
README, and RD-19 ticket. Fix two upward-relative links inside the moved
WP files (WP-68, WP-69) that gained a directory level and would otherwise
break. Repoint `.prettierignore`'s two agent-prompt exclusions to their
new path, so prettier keeps leaving those files' exact wording alone.

Mark RD-30 done and check off its acceptance criteria; flip its README
row to done.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
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co-authored by Claude Opus 5
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# RB-04 — mask the BSN recorded as `AuditEntry.Actor`
Status: **implemented** · 2026-08-27 · Source findings: `07-bio2-compliance.md` BIO-005 · `99-backlog.md` RB-04
## What was wrong
`DocumentStore` writes one audit row per upload and per user delete, with the acting
citizen's raw BSN as `AuditEntry.Actor`, persisted to SQLite. The class's own doc comment
says "The audit log holds metadata only (never file content **or other PII**)" — a BSN in
every row is precisely other PII. Same failure shape as RB-02, in a second store.
## What changed
| File | Change |
| ------------------------------------- | --------------------------------------------------------- |
| `Data/DocumentStore.cs` `Add` | `Audit("upload", …, Pii.MaskTail(owner, 3))` |
| `Data/DocumentStore.cs` `DeleteOwned` | `Audit("delete-user", …, Pii.MaskTail(owner, 3))` |
| `Data/DocumentStore.cs` `Audit` | doc comment: actors arrive **already redacted** |
| `UploadAccessTests.cs` | **new** `The_document_audit_trail_records_a_masked_actor` |
**Masked at the two call sites, not inside `Audit`** — unlike RB-03, where masking in the
mapper was the point. `Audit`'s third actor is the literal `"admin"` (from `AdminDelete`),
and `MaskTail("admin", 3)` is `"**min"`: masking centrally would mean guessing which
actors are BSNs and which are role names. The contract is stated on `Audit` instead.
**`StoredDocument.Owner` is untouched**, per the ticket. It is the authorization key —
`DeleteOwned`, `ForeignIds` and now the RB-01 content check all compare against it — so it
has to stay whole. The BSN remains where it is load-bearing and leaves the trail where it
was only decoration.
Nothing reads `DocumentStore.AuditLog` today (no endpoint exposes it), so this is a
data-at-rest fix with no response-shape change.
## Verification
`dotnet format --verify-no-changes` clean. `dotnet test`: **252 passed, 1 failed** — the
pre-existing `OpenZaakIntegrationTests.Admin_cases_…`, which needs a live container.