Two gaps closed in `codegraph_explore` output quality:
**Interface/registry dispatch (#687 extension).** When a named token resolves to
a large same-name family (≥8 members) that doesn't land on the connected flow, the
static path truly ends there — the target is chosen at runtime from N implementations
(plugin/strategy/handler interface). `buildPolymorphicBoundaries` detects this via
`implements`/`extends` edges, ranks candidate supertypes by their TRUE graph-wide
implementer count (not FTS sample frequency, which is biased), and emits a
"## Interface dispatch" section naming the supertype, implementer count, and a few
concrete targets. Fires only for uncovered named tokens; a connected flow stays silent.
**Oversize spine method windowing.** A flow entry that is a god-method (e.g. n8n's
962-line `processRunExecutionData`) previously lost the per-file budget to denser
peripheral blocks and was dropped, forcing the agent to `Read` it back. The spine
call site (edge line to the next hop) is now tracked via `spineCallSites` and used
to window the method to its signature head + a ±28-line band around the call, keeping
it under the OVERSIZE_SPINE_LINES threshold. Spine clusters also rank first in the
budget sort and may exceed the per-file cap up to a 2.5× ceiling so they can never be
starved by co-flow files.
Test suite gains an `interface dispatch` describe block (announce, silent-on-connected,
silent-below-threshold) and uses `beforeAll`/`afterAll` to pin `CODEGRAPH_OFFLOAD_DISABLE=1`
so structural assertions are hermetic regardless of machine config.
Colby McHenry
e7d9f8c6fa