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

docs/glossary.md

@@ -100,6 +100,11 @@ Match hash
 Two readings agree only when their match hashes are equal and their complex-notation keys are equal.
 A complex-notation key is `notation:source` for a piece of math too complex for the formats to normalize, with the source's whitespace removed ([5.3](../spec/05-hashes.md#53-the-strict-projection)). ([5.1](../spec/05-hashes.md#51-the-five-values), [5.3](../spec/05-hashes.md#53-the-strict-projection))
 
+Math form
+:   A standard spelling of formulas, so that one formula is written alike in every paper and claim.
+`scienting-math/1` is canonical TeX, with a tree read from it and a key for each symbol; papermath implements it.
+An equation or math run in the form says so with `form`, which enters no hash, and its tree lives in `derived/math.jsonl`. ([3.7](../spec/03-nodes.md#37-math-forms), [9.4](../spec/09-figures-tables-equations.md#94-the-math-form))
+
 ML-DSA-65
 :   Outside term.
 The lattice-based signature scheme of FIPS 204, believed to resist quantum computers.
@@ -172,6 +177,10 @@ Strict projection
 Suspect
 :   A doubtful reading raised for a person or a review session to answer. ([5.7](../spec/05-hashes.md#57-suspects))
 
+Symbol key
+:   The name of a symbol in a formula, its canonical TeX with `\mathrm` spelled `\text`: `K_{r}` for `K_r`.
+A paper's symbols and a lode claim's have one key, so a `symbol` annotation names its symbol by it. ([9.4](../spec/09-figures-tables-equations.md#94-the-math-form), [18.4](../spec/18-layers.md#184-bodies))
+
 Targeted F3
 :   Proofreading the nodes a team's claims, quotations and datasets rest on, rather than every node.
 The target set also includes the leaves of every anchored container, every equation and, under the project's digit rule (`all`, `anchored-sections` or `none`), sentences and cells with a digit in a text or math run (an inline stretch of plain text, or of TeX or Typst math, within the node; [3.5](../spec/03-nodes.md#35-inline-runs)). ([8.10](../spec/08-fidelity.md#810-targeted-f3))