Declare <T> on the 6 generic fns that used an undeclared type parameter (native broker 1C)

[gunbai-bot]

Native broker 1C. gentle-dove-36 split this out of #13265 so the broker-relevant half can land now. #13265 (the scoping and the deletion of the implicit-name list) stays held behind derived-node-identity step 2.

Six generic functions used T without declaring <T>. They resolved only because a generic type declaration's parameters leak into module scope. The Rust emitter renders only declared parameters, so each one emitted as a generic function without its type parameter (E0425: cannot find type T). That is one of the broker closure's emitter blockers.

Module	Functions
extdeps.languages.json.parse	json_field_value, json_field_cause
extdeps.docker.container_inspect	nested_value, nested_causes
gunbc.machine_intake.mtjade1_access_observation	read_cause
gunbc.machine_intake.mtcollins1_boot_diagnostic_bundle	members_channel

Each T is the fresh parameter of the generic reading type it consumes. A declared parameter is correct under today's scoping as well, so this change does not expose the name-lookup instantiation path that #13265 surfaced.

Checked:

• all four modules resolve;
• gunbc compile --entry dag/extdeps/languages/json/parse.dag --target rust now emits pub fn json_field_value<T: Clone>(...) and pub fn json_field_cause<T: Clone>(...), with 0 blocking diagnostics.

The census showing these 6 are the whole population is on #13265.

This is a source-only change, with no emitter or mirror edits.

🤖 Generated with Claude Code

[briansrls]

LAND on code. Each helper's T is the fresh parameter carried by its JsonFieldRead/NestedObjectRead/MembersReading input, so declaring <T> on the function is the honest source repair under both today's leaked module scope and the intended declaration-local scope. This removes the six emitter E0425 sites without depending on #13265's scoping change or inventing a renderer exception. Exact-head CI is still running and the branch currently needs main integration, so this approval does not assert queue readiness.