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C-1/C-2 introduced `GraphRouting` and pointed the middleware at it.
This commit removes the legacy shape that's now dead:
* `ServerMode` enum — deleted. Single mode's `uri` lives on
`handle.uri`; multi mode's `config_path` lives on the
`GraphRouting::Multi` arm.
* `AppState.mode: ServerMode` field — deleted.
* `AppState.registry: Arc<GraphRegistry>` field — deleted. Multi
mode's registry is on `GraphRouting::Multi { registry, .. }`;
single mode has no registry at all.
* `AppState::mode()`, `AppState::uri()`, `AppState::registry()`
accessors — deleted. New `AppState::routing() -> &GraphRouting`
is the single public entry point.
* `SINGLE_GRAPH_KEY_ID` constant — deleted. `GraphHandle.key` is
still required by the struct, but in single mode the key is now
only a tracing label (`"default"`, inlined with a comment naming
its sole remaining purpose). Single-mode flat routes never carry
a `{graph_id}` parameter, so the key is never compared against
user input, and there is no registry where it could be a map
key. C-1/C-2 already removed the registry walk that the sentinel
was named for.
Callers migrated:
* `build_app` (lib.rs:944) — matches on `state.routing()` instead
of `state.mode()`.
* `server_graphs_list` (lib.rs:1162) — destructures the Multi arm
to get the registry; Single arm short-circuits to 405.
* `server_openapi` (lib.rs:1217) — matches the Multi arm for the
cluster-prefix rewrite.
* `tests/server.rs:3735` — the B2 footgun regression test now
matches on `state.routing()` to extract the single-mode handle
(the test's earlier `state.registry().list().next()` shape was
the closest pre-fix analog to "embedded consumer reaches the
engine"; the new shape is more direct).
Closes the entire "single mode forced through a multi-mode
abstraction" class. After this commit:
* No magic sentinel as a routing key.
* No `single_mode_handle` walk-and-assert helper.
* No 500-class "programmer error" branch in the middleware.
* No two-field discriminant on `AppState` where one would do.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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| server.rs | ||