Read a mind: views, queries, open items and history

`query.rs` is the read side, over a `&Mind<S>` with no store file, no
daemon and no index. A `PipelineDocumentView` is four fields: the id,
because a `PipelineDocument` does not carry its key and a client must
never derive one; the document; the facts of its admission; and its
status.

The facts come from the commit receipts and from their `writes` alone,
so a document a later batch cited as a strong read keeps the receipt
that wrote it, and `admitted_at` is that receipt's `committed_at` -- the
`now` admission was passed -- never the store's `stored_at`. A pipeline
document the image holds and no receipt wrote is an integrity fault and
refuses; the store has one writer and the receipt is its proof.

Status is derived per call through `docs::Docs`, the same owner the
admission rules ask, so a withdrawn resolution reopens its subject for a
reader exactly when it reopens it for a rule. `closing_resolution` is
`in_force_unless`'s own body asked for the resolution rather than the
bool, so there is no second derivation to drift.

Four reads: `view` by id, `query` over the filters (root, repo, cut,
kinds, in force, faculty, an admission window), `open_items` for one
campaign's unanswered questions, standing findings, follow-ups,
unreported specs and unjudged reports, and `history` for every
resolution a subject ever had or every assignment of a repo to this
mind, withdrawn ones included with their reasons.

A query is ordered by `(admitted_at, id)`, capped at 200, and carries
`matched`, the count before the cap, so a truncation is never a short
page that reads like the whole answer. `semantic` is accepted by the
type and refused typed until Cut 11 owns the index; no substring filter
lives here to become a second answer to "the text of a document".

`cargo test -p huginn-mind --lib`: 56 passed, 0 failed, 0 warnings
(46 + the ten tests). `cargo check --workspace` clean. No dependency, no
target, no kind, no schema, no epoch; `Cargo.toml` and `Cargo.lock`
untouched.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

AGENTS.md

@@ -14,10 +14,12 @@ Studio's job, not Huginn's.
 - Body: a Rust workspace of `huginn-mind`, `huginn-daemon`, and
   `eureka-state` under `crates/`. Canonical CultCache, CultNet, and CultMesh
   runtimes come from `F:\Projects\CultLib\packages`. `huginn-mind` is live:
-  it persists and admits an instance's mind, over `cultcache-rs` and
-  `epiphany-pipeline` pinned by git rev. `huginn-daemon` and `eureka-state`
+  it persists, admits and reads back an instance's mind, queries and derived
+  status included, over `cultcache-rs` and `epiphany-pipeline` pinned by git
+  rev. `huginn-daemon` and `eureka-state`
   are stubs with no dependencies; nothing here publishes or connects yet.
-- Owned: an instance's memory documents and their admission, in `huginn-mind`,
+- Owned: an instance's memory documents, their admission and the read side
+  that derives their status, in `huginn-mind`,
   over a redb CultCache store at `<state_root>/minds/<instance>/mind.redb`.
   Their CultNet publication is owned here and not built; `huginn-daemon` is a
   stub.