feat: comment categories; emend, relink and resolve corrections

scienting-layer/1: an optional, fixed category on comment, caveat and
question bodies (comment, context, critique, question, correction,
feedback, resource).

Corrections: emend fixes the authors' own slip and keeps what was printed
(a run's printed), never lowering fidelity or a witness match; relink sets
or removes what a citation names; resolve sets a reference's resolution.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017R7sgDNvUGWY2zFPCq2JH6

vectors/README.md

@@ -106,8 +106,8 @@ The table below uses a few terms that the chapters define:
 | `normalize.jsonl` | Normalization for hashing, and the SHA-256 of the result. | [1.4](../spec/01-conventions.md#14-text-normalization-for-hashing) |
 | `ids.jsonl` | Minting payloads and node IDs, and letter-first encodings of digests. | [4](../spec/04-identity.md) |
 | `notation.jsonl` | Each math source's canonical linear form, or null when it is complex. | [5.4](../spec/05-hashes.md#54-simple-notation) |
-| `projections.jsonl` | One-sentence runs: plain, normalized, strict and lossy projections, complex keys and the three text values. | [5.3](../spec/05-hashes.md#53-the-strict-projection) |
-| `projection-groups.jsonl` | Which cases must share, or must differ in, a value: H₂O in six spellings, cm⁻¹, 10⁻³, K_r, ligatures, the micro sign, "103" against 10³. | [5.3](../spec/05-hashes.md#53-the-strict-projection) |
+| `projections.jsonl` | One-sentence runs: plain, normalized, strict and lossy projections, complex keys and the three text values, and the projection as printed (`printed`) of an emended sentence. | [5.3](../spec/05-hashes.md#53-the-strict-projection), [3.6](../spec/03-nodes.md#36-the-plain-projection) |
+| `projection-groups.jsonl` | Which cases must share, or must differ in, a value: H₂O in six spellings, cm⁻¹, 10⁻³, K_r, ligatures, the micro sign, "103" against 10³, and an emended sentence against its printed text. | [5.3](../spec/05-hashes.md#53-the-strict-projection) |
 | `offsets.jsonl` | Code-point spans and their UTF-16 equivalents. | [1.5](../spec/01-conventions.md#15-character-offsets) |
 | `hashes.jsonl` | Every node of a small document, its own content and its five values. | [5.1](../spec/05-hashes.md#51-the-five-values) |
 | `addresses.jsonl` | How addresses parse; null for invalid ones. | [6.1](../spec/06-anchors.md#61-addresses) |
@@ -118,7 +118,7 @@ The table below uses a few terms that the chapters define:
 | `spotcheck.jsonl` | Seed payloads, seeds, sample sizes and samples. | [8.8](../spec/08-fidelity.md#88-spot-checks) |
 | `bounds.jsonl` | Reviewer error bounds as reported. | [8.9](../spec/08-fidelity.md#89-reviewer-error-bounds) |
 | `alignment.jsonl` | Two readings of a document, their pairs and their suspects. | [5.6](../spec/05-hashes.md#56-alignment) |
-| `corrections.jsonl` | Each operation and refusal on a small document: the state before, the correction, and the record and state after, or the rule broken. | [11](../spec/11-corrections.md) |
+| `corrections.jsonl` | Each operation and refusal on a small document: the state before, the correction, and the record and state after, or the rule broken; with the reference records for a `resolve`, and the leaf as printed for an `emend`. | [11](../spec/11-corrections.md) |
 | `resolve.jsonl` | Anchors made on the example paper's first reading, and how each resolves after its corrections. | [6.5](../spec/06-anchors.md#65-resolution) |
 | `rights.jsonl` | Stage checks with policies and expiry, the combining rule, and backend conditions. | [14](../spec/14-rights.md) |
 | `grading.jsonl` | Exercises, submissions and the grades they earn. | [19.4](../spec/19-exercises.md#194-grading) |
@@ -138,7 +138,7 @@ A candidate format changes only with a recorded reason and a new or changed vect
 
 A passing run shows one thing: for these inputs, your implementation computes the same values as the reference implementation in `src/paperspec/`.
 That code computed the expected outputs, and `pixi run build` regenerates them ([tools/](../tools/README.md)).
-The vectors hold 312 cases in all, some of them small: `hashes.jsonl` has one document, `alignment.jsonl` two pairs of readings, `offsets.jsonl` two cases.
+The vectors hold 329 cases in all, some of them small: `hashes.jsonl` has one document, `alignment.jsonl` two pairs of readings, `offsets.jsonl` two cases.
 
 The vectors do not show the following.