refactor(core)!: split AnyRecord into capability traits (036 W2)

[lxsaah]

Summary

Implements W2 from 036-followup-refactoring.md (034 §3.8): splits the ~22-method AnyRecord god-trait by consumer, stacked on the W1 branch (#141) in the same breaking window.

• AnyRecord (6 methods) — storage/lifecycle only: validate, as_any(_mut), drain_config_errors, set_writable_erased, plus the cfg-gated json_access() accessor so the remote-access gate lives in one place for consumers.
• RecordIntrospect (supertrait) — graph/metadata introspection: connector links, has_*, record_origin, buffer_info, transform_input_keys, collect_metadata. Consumed by the builder's dependency-graph construction, route collection, and list_records.
• JsonRecordAccess (cfg remote-access) — latest_json / subscribe_json / set_from_json, reached via json_access(). The runtime .with_remote_access() checks stay inside the methods → no behavior change. (The 036 sketch said json-serialize; the code gate is and stays remote-access.)
• RecordMetricsReset (supertrait) — the cfg-gated, no-op-default profiling/metrics resets.

Supertrait wiring keeps every dyn AnyRecord call site compiling unchanged; only the four JSON call sites (builder try_latest_as_json/set_record_from_json, AimX dispatch drain, remote::stream) switch to the accessor. Registry storage stays Vec<Box<dyn AnyRecord>>. Also drops the dead outbound_connector_urls (cfg std) — zero callers in-tree and in aimdb-pro.

Acceptance (036 W2): AnyRecord ≤ ~8 methods ✓ (6); no behavior change ✓ (bodies and error messages moved verbatim; session smoke tests unmodified); rustdoc per trait names its consumer ✓.

Notes for review

• Stacked on refactor/036-w1-data-plane-de-any — retarget to main once refactor(core)!: data-plane de-Any — fuse typed pipelines at registration (036 W1) #141 merges.
• Breaking for any external AnyRecord implementor or caller of the moved methods on concrete types (in-tree there are none; introspection methods have same-named inherent TypedRecord counterparts).

Test plan

• make build / make test — full CI feature matrix (incl. --no-default-features --features alloc{,profiling,metrics,connector-session}, thumbv7em, wasm) ✅
• make clippy (-D warnings, all combos) + make fmt-check ✅
• aimdb-pro cargo check against the new core ✅

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