Schema v2 conformance gaps vs keystone — stage-5 gate before v0.4.0 (edge keys, mixed identity, containment names) #98

PROBLEM

Stage-5 pre-release conformance check (2026-07-14, branch feat/v2-stage5-docs-release @ 3d39bbf) against the canonical schema-v2 keystone, run side-by-side with codeanalyzer-typescript-v2 (conformant reference) on paired fixtures at -a 1 and -a 4. Both pass levels 1-4 and the L1⊆L4 superset gate — but five deviations from the keystone remain, two of them load-bearing. These must land BEFORE the 0.4.0 tag, or they bake into v2 goldens and force per-language special cases in the SDK's shared cpg models (parity-clause violation).

GAPS (evidence: paired analysis.json runs; fixtures available on request)

1. BLOCKING — edge keys: call_graph edges emit {source, target, type: "CALL_DEP", provenance, weight}. Keystone: {src, dst, prov, weight}; the list name IS the type (no type field). TS-v2 emits the keystone form.
2. BLOCKING — mixed identity: edge source is a can:// id (can://python/pyfix/pkg/mod.py/entry()) while target is an old dotted signature (pkg.mod.ResUsers.init). Violates "no dangling endpoints" — the target matches no node id; id-joins and cross-projection checks fail.
3. BLOCKING — containment vocabulary: module carries classes{} and type carries methods{}. Keystone: types{} and callables{} (shared names, never renamed — this is what lets one SDK model set parse every analyzer).
4. INVESTIGATE — param_in/param_out empty at -a 4 on a fixture where TS-v2 emits both (entry -> method -> method chain with args + returns). Possibly downstream of gap 2 (identity mismatch breaks interprocedural linking); confirm after 1-3 land.
5. MINOR — envelope: analyzer{name,version} absent; k_limit emitted at -a 1 (keystone: present at L4).

DEFINITION OF DONE

• Paired fixture re-run shows key-for-key envelope/edge/containment parity with codeanalyzer-typescript-v2 modulo language-specific additive fields.
• L1⊆…⊆L4 superset gate still green after the renames.
• param_in/param_out non-empty on the interprocedural fixture (or an explained, documented reason).
• Lands before the v0.4.0 tag.

Part of the schema-v2 migration epic #69 (stage 5 gate). Blocks python-sdk 2.0.0-rc.1 F2 (codellm-devkit/python-sdk#240 / epic codellm-devkit/python-sdk#238).