feat: scienting-math/1 sources and derived/math.jsonl; lode references; stress fixes

Math content may say its source is in scienting-math/1's canonical TeX (form,
in no hash); derived/math.jsonl holds papermath's tree, symbols and issues,
and the validator now checks derived files. A symbol annotation names its
symbol by key; lode claim references use lode's tag and pin syntax. The zip
reader refuses entries zipfile cannot read, and checkpoint lines end in LF only.

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

spec/22-conformance.md

@@ -22,7 +22,7 @@ A validator checks, in order, and reports each failure as `path:line: rule: mess
 3. The tree ([3](03-nodes.md)), runs and references between nodes, the counts, and the keys ([2.4](02-model.md#24-work-and-document-keys)).
 4. The policy and hashing scheme ([12.5](12-package.md#125-text-policies)).
 5. The five values of every node, the root and `meta_hash`, when the text is present and the key, if any, is known.
-6. The ID table, the corrections and the history root, the witnesses, pages, locations and references, and every file's order.
+6. The ID table, the corrections and the history root, the witnesses, pages, locations and references, the formulas derived files name, and every file's order.
 7. Receipts: IDs, roots, documents, node order, signatures against the package's roster, spot-check keys, seeds and samples, and the fidelity distribution.
 
 ## 22.3 Schemas
@@ -39,7 +39,8 @@ Rule IDs are stable: a rule's meaning never changes, and a retired rule's ID is
 | Prefix | Covers |
 | --- | --- |
 | `package.` | The manifest, paths, files and schemas. |
-| `doc.tree.`, `doc.node.`, `doc.run.`, `doc.table.` | The tree, node content and runs. |
+| `doc.tree.`, `doc.node.`, `doc.run.`, `doc.table.`, `doc.math.` | The tree, node content and runs. |
+| `doc.derived.` | Derived files ([12.7](12-package.md#127-derived-files)). |
 | `doc.hash.` | The five values, the root and the metadata hash. |
 | `doc.id.`, `doc.order.` | The ID table and file order. |
 | `doc.policy.` | Text policies and keyed hashing. |