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c95ecff828
Pre-fix, `AppState` always carried `Arc<GraphRegistry>` even when
serving one graph. Single mode populated the registry with one
handle keyed by the `SINGLE_GRAPH_KEY_ID = "default"` sentinel;
`single_mode_handle` walked the registry, asserted `len == 1`,
and returned the single element with a 500-class "programmer
error" branch on mismatch. Three smells in a row — magic key,
walk-and-assert, programmer-error guard — all because the
single-mode runtime was forced through a multi-mode abstraction.
Correct-by-design fix: type the routing.
* New `pub enum GraphRouting { Single { handle }, Multi { registry,
config_path } }` on `AppState`. The `Single` arm carries the handle
directly — no registry, no key, no walk.
* `resolve_graph_handle` middleware matches on `routing`. Single mode
returns the handle in O(1); multi mode does the same path-extract +
registry lookup as before. The 500-class programmer-error branch
is gone — the type system now makes the violated invariant
("single mode has exactly one handle") unrepresentable.
* `requires_bearer_auth` reads `handle.policy.is_some()` directly
in the Single arm; Multi arm still uses the cached
`any_per_graph_policy` flag.
`ServerMode` and the legacy `registry` field on `AppState` are still
populated for now — C-3 removes both once every reader is migrated.
The `SINGLE_GRAPH_KEY_ID` sentinel and `ServerMode` will also go
away in C-3.
Closes the "single mode forced through a multi-mode abstraction"
class. All 76 server integration tests stay green: handlers still
extract `Extension<Arc<GraphHandle>>` from the request, so the
middleware's internal change is invisible to them.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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