Merge v2: learned context, context guard, wake-on-LAN, identity

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/implementer-log.md

@@ -5,6 +5,12 @@ owner fills in the Model column. The reviewer adds findings under "Reviews" once
 
 | Task | Date | Status | Gate runs | First gate | Deviations | Notes | Model |
 |---|---|---|---|---|---|---|---|
+| v2/05-wiring-smoke | 2026-09-25 | done | 1 | pass | none | The wiring in `cmd/crossbar/main.go` and `internal/proxy/{proxy,forward,ctxguard}.go` plus the README section were already in the working tree from a prior session; this session only ran the tests, the gate, the log row, and the commit. `go test -race -count=1 ./...` failed once on `TestQueueFullIs503` (`Errors:2`, the 503 not recorded) — the known v1 recording defect the owner scheduled as a v2.1 task 01; reran once and it passed. `make gate` printed `gate: ok` on the first run. Committed the two owner-corrected given v1 tests (`internal/limiter/limiter_test.go`, `internal/proxy/proxy_test.go`) alongside the prior session's changes. | ? |
+| v2/04-identity | 2026-09-25 | done | 1 | pass | new file `internal/config/identity.go` | Implemented `internal/identity/identity.go`: `ParseWhois` (Node = ComputedName, else Name minus trailing dot/domain; empty node errors), `TailscaleResolver` (`tailscale whois --json`, 3 s timeout, non-zero exit → `ErrNotAPeer`, missing binary a real deny), `Checker` with a 5-min per-address cache that also caches `ErrNotAPeer`, and `NewHeaderChecker`/`WithHeaderPeer` that read the peer from a context value. `middleware.go` names the route like the proxy (X-Crossbar-Route header, else first path segment), passes `/_crossbar/` and unknown routes straight through, and answers 403 `{"error":"forbidden route"}`. Config gains `Identity`/`Wake`/`Peers`; validation keys the peers check on the *explicit* identity value (a config with peers but no identity key passes), and `wake.wait` defaults to 45 s. Copied all four given files byte-identical; `go test -race ./internal/identity/ ./internal/config/` and `make gate` printed `gate: ok` on the first run. | ? |
+| v2/03-wake | 2026-09-25 | done | 1 | pass | none | Implemented wake-on-LAN in new `internal/wake/wake.go`: `MagicPacket` builds the 102-byte frame via `net.ParseMAC` (six `0xff` bytes plus the MAC repeated sixteen times) and rejects bad MACs; `Send` emits one UDP4 datagram to the resolved broadcast address, returning parse/resolve/write errors; `Waker` tracks last-sent per host under a mutex and sends at most once per `Wait` window, polling health every second (`PollEvery` is a test hook) until healthy, on `Wait` timeout, or on ctx cancellation, returning false for an unknown host without sending. Copied `internal/wake/wake_test.go` byte-identical to `docs/plans/v2/_files/`; `go test -race -count=3 ./internal/wake/` ok and `make gate` printed `gate: ok` on the first run. | llama.cpp/ornith-1.5-35b-a3b |
+| v2/02-ctxguard | 2026-09-25 | done | 1 | pass | none | Implemented the context-size guard in new `internal/proxy/ctxguard.go` (estimate `int(float64(len(body))/4*1.2)`; rule 2 skip on unknown/fit; rule 3 move via `leases.Move` with a `moved:<old>><new>` header; rule 4 400 with `{"error":"prompt too large","estimate":E,"max":M}` and a status-400 accounting row, no forward, no mark-down) and wired it into `ServeHTTP` between the lease and the slot; added `Move` to `internal/lease/lease.go` (re-leases, deletes the old row, records a `ctx` event) and `ReasonCtx = "ctx"` to `internal/store`. Copied `internal/proxy/ctxguard_test.go` byte-identical to `docs/plans/v2/_files/`; `go test -race -count=2 ./internal/proxy/ ./internal/lease/` ok and `make gate` printed `gate: ok` on the first run. | llama.cpp/ornith-1.5-35b-a3b |
+| v2/01-props | 2026-09-25 | done | 1 | pass | none | Implemented /props learning in `internal/health/health.go`: added `Status.NCtx`/`Status.Slots`, `PerSlotCtx()`, and a best-effort `GET <base>/props` appended to the poll after `/v1/models`, setting NCtx/Slots to 0 (negative → 0) on any failure without counting the poll as failed; exposed them in `internal/admin/admin.go` `HostView`. Copied `internal/health/props_test.go` and the replacement `internal/proxy/helpers_test.go` byte-identical to `docs/plans/v2/_files/`. `go test -race ./...` and `make gate` pass on the first run. | ? |
+| v2/01-props | 2026-09-25 | stopped | 1 | fail | none | Implemented /props learning in `internal/health/health.go` (added `Status.NCtx`/`Status.Slots`, `PerSlotCtx`, and a best-effort `GET <base>/props` appended to the poll; 0/unknown on any failure without failing the poll) and exposed them in `internal/admin/admin.go` `HostView`; copied `internal/health/props_test.go` byte-identical to `docs/plans/v2/_files/`. `go test -race ./internal/health/ ./internal/admin/` ok. `make gate` fails on two GIVEN v1 proxy tests — `TestConversationIsStickyAndLeaseHeaderTellsWhy` (alpha 1/beta 7, want 0/6) and `TestDifferentConversationsSpreadByFreeSlots` (beta 3/alpha 2, want 2/1) — which assert exact upstream hit counts; the task-required `/props` poll now lands on that scaffold's `/` catch-all and bumps the counter by exactly 1 per host (deterministic, confirmed over 3 repeated runs, not a flake). `internal/proxy/helpers_test.go` is byte-identical to `docs/plans/v1/_files/` (protected) and cannot be updated here; the `/props` request is unavoidable per the task, so the owner must hand over a scaffold that registers `/props` without counting it as a hit. Code left uncommitted for review. | ? |
 | v1.1/01-review-fixes | 2026-09-25 | done | 1 | pass | none | Copied `cancel_test.go` and `usage_empty_test.go` byte-identical from `docs/plans/v1.1/_files/`; the earlier session's fixes in `internal/proxy/proxy.go`, `internal/proxy/forward.go` and `internal/admin/admin_ops.go` were already in the working tree. `make gate` printed `gate: ok` on the first run. | llama.cpp/ornith-1.5-35b-a3b |
 | v1/08-smoke-readme | 2026-09-25 | done | 1 | pass | owner-directed fix to `Free` in `proxy.Chooser` | Changed `Free` from `c.lim.FreeSlots(host)` (sum over every model) to per-model free slots, `freeForModel(cfg.Hosts[host], model, c.lim.InFlight(host, model))`, floored at 0 and 0 when the host does not list the model (new helper in hosts.go); the one code change the task directs. `go test -race ./internal/proxy/` and `make gate` pass on the first run; `make smoke` → `smoke: ok (stream spread 1006 ms)`. README intro, `## Configure` (added db/lease_idle/retention, rewrote queue_max and hosts.<name>.hosts) and `## Inspect`→`## Operate` (all six endpoints, examples taken from the smoke run) updated. | llama.cpp/ornith-1.5-35b-a3b |
 | v1/07-main | 2026-09-25 | done | 1 | pass | none | Wired store, limiter and lease table into `cmd/crossbar/main.go`: `store.Open` before the health table, `limiter.Configure` per (host, model) from `cfg.Hosts`, `lease.New` with `proxy.Chooser`, `Candidates` for every route, three background goroutines (idle expiry per minute, prune per hour logging the count, host-health recording per `poll_interval`), and `st.Close` via `defer`. The 3s SIGTERM run exits 0 with `listening`/`shutting down`; the missing-config run exits 1. | llama.cpp/ornith-1.5-35b-a3b |