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## What
Adds a per-node **Reach** view that answers "how well does this specific
node hear, and get heard by, its neighbours?" — both as a standalone
page (`#/nodes/{pubkey}/reach`) and as a section on the node detail
page.
New endpoint: **`GET /api/nodes/{pubkey}/reach`**.
## What it measures
For the target node it derives, from raw `path_json` adjacency (a path
travels origin→observer, so in `[A,B]` B received A directly):
- **Directional link counts** per neighbour: `we_hear` (how often we
received them) vs `they_hear` (how often they received us).
- **Bidirectional / bottleneck**: a link is two-way stable when both
directions > 0; the weaker direction is the bottleneck and rates real
two-way reliability.
- **Importance**: neighbour degree + rank, relay-observation volume,
bidirectional-link count, direct-observer count.
- **Direct observers**: who received the node at 0 hops, with SNR.
Reliability rule: a neighbour is only attributed when its pubkey
**prefix is unique** at the path's byte length (collisions are skipped,
never misattributed).
## UI
- Standalone Reach page + node-detail section.
- Reusable bidirectional link map (OSM) with links coloured by
bottleneck.
- Incoming/outgoing toggles to isolate each direction.
## Naming note (deliberate, no collision)
This is distinct from the existing **per-observer reachability** in
topology analytics (`ReachNode` / `ObserverReach` / `perObserverReach`).
This PR adds its own `NodeReach*` response structs in a new
`node_reach.go` and a new `/api/nodes/{pubkey}/reach` route — there are
no symbol or route collisions (verified: `go build ./...` clean). Happy
to rename to disambiguate further (e.g. "Link Quality") if you'd prefer
to reserve "Reach" for the per-observer feature.
## Testing
- `cmd/server`: endpoint shape/404/limit-clamp + unit tests for token
derivation and directional attribution, plus a scan benchmark — all
pass.
- Frontend: helper tests + Reach-page E2E (`test-node-reach-e2e.js`),
standalone route + incoming/outgoing toggles.
- `go build ./...` and `eslint public/*.js` (no-undef) clean.
## Docs
Design spec, implementation plan, and the `GET
/api/nodes/{pubkey}/reach` API contract are included under `docs/`.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>