fix: accessed_symbols declared in IR and graph schema but never collected — 0/1,100 Callables carry it (CLDK-007)

[rahlk]

From the external quality audit of the Juice Shop v1 export (schema 1.0.0), finding CLDK-007 (severity Medium): source-read dependencies cannot be reconstructed from the graph.

Audit evidence

0 of 1,100 Callable nodes carry accessed_symbols_json, while all carry parameters_json.

Root cause

The field is declared end-to-end but never collected:

• IR declares it: accessed_symbols: TSSymbol[] (src/schema/schema.ts:161); Neo4j schema declares it (src/build/neo4j/schema.ts:177); the projection would emit it (callableProps, src/build/neo4j/project.ts:391).
• But the only writes are hard-coded empty initializers in buildCallable and the implicit-constructor builder (src/syntactic_analysis/builders.ts:447, 488) — no assignment or push anywhere in src/. stringifyIf([]) → null → pruned, so the property never appears.

Contrast: parameters is populated (builders.ts:442), hence the observed asymmetry. The Python analyzer does populate its accessed_symbols_json.

Fix direction

Either implement the collector (identifier reads per callable body, Python-analyzer parity) or remove the field from the IR + graph schema so the contract stops advertising data that never exists. Decide as part of the v2 schema work — the v2 shape currently carries neither parameters_json nor accessed_symbols_json, so this is the moment to pick one deliberately.