fix(taskfile): remove build targets for binaries deleted months ago, and make check build

Closes #120 (items 2 and the suggested gate fix).

`task build` has been broken since `cmd/supervisor` was deleted in c117634, and
CI stayed green the entire time. That combination is the finding: not that a
path went stale, but that nothing could notice.

`check` ran lint, test and vet. All three walk `./...`, which enumerates the
packages that EXIST. A build target naming a DELETED package is invisible to
every one of them — `go vet ./...` cannot complain about a directory it never
visits. The gate was complete with respect to the code present and blind to the
code referenced.

`build` is now part of `check`, with that reasoning written above it.
Flip-tested: reintroducing `go build ./cmd/supervisor` takes `task check` to
exit 201, naming the missing directory.

Removed, all pointing at binaries that no longer exist:

- `supervisor:dev` and `supervisor:build`     -> ./cmd/supervisor
- `supervisor:test:smoke`                     -> curls a server nothing can start
- `smoke:routing` + scripts/smoke-routing.sh  -> ./cmd/routing
- the `supervisor:` line in Procfile, which also still pointed
  SUPERVISOR_MODELS_FILE at the file deleted in #116

`build` now aggregates `hyperguild:build` + `ingestion:build`, the two binaries
that actually exist.

A false lead worth recording so it is not re-investigated: a first sweep flagged
`./cmd/server` and `./cmd/frontmatterlint` as missing too. They are not — their
tasks set `dir: ingestion`, and both exist under `ingestion/cmd/`. Any checker
for this class has to resolve a task's working directory before judging its
paths, or it reports two false positives for every true one.

Not addressed here: #120's third item, that `internal/config` has zero non-test
callers. `RoutingConfig` is the only written record of the routing pod's
configuration contract, so deleting it is a judgement call rather than a
correction.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/smoke-routing.sh

@@ -1,64 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# Boot the routing binary and exercise its four tools against live deps.
-# Skipped when LITELLM_BASE_URL or BRAIN_URL is unreachable.
-
-LITELLM_BASE_URL="${LITELLM_BASE_URL:-https://llm-api.d-ma.be}"
-BRAIN_URL="${BRAIN_URL:-http://koala:30330}"
-
-if ! curl -sS --max-time 2 "${LITELLM_BASE_URL}/v1/models" >/dev/null 2>&1; then
-  echo "SKIP: LITELLM at ${LITELLM_BASE_URL} unreachable"
-  exit 0
-fi
-if ! curl -sS --max-time 2 "${BRAIN_URL}/query" -X POST -d '{"query":"x","k":1}' -H 'Content-Type: application/json' >/dev/null 2>&1; then
-  echo "SKIP: BRAIN at ${BRAIN_URL} unreachable"
-  exit 0
-fi
-
-PORT=33310
-BIN=$(mktemp)
-trap 'rm -f $BIN; pkill -P $$ -f "$BIN" 2>/dev/null || true' EXIT
-
-go build -o "$BIN" ./cmd/routing
-
-LITELLM_BASE_URL="$LITELLM_BASE_URL" BRAIN_URL="$BRAIN_URL" \
-  ROUTING_PORT="$PORT" SUPERVISOR_CONFIG_DIR="$(pwd)/config/supervisor" \
-  "$BIN" &
-
-# Wait for the binary to bind.
-for _ in $(seq 1 50); do
-  curl -sS "http://127.0.0.1:${PORT}/healthz" >/dev/null 2>&1 && break
-  sleep 0.1
-done
-
-call_tool() {
-  local tool="$1"
-  local args="$2"
-  curl -sS -X POST "http://127.0.0.1:${PORT}/mcp" \
-    -H 'Content-Type: application/json' \
-    -d "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"${tool}\",\"arguments\":${args}}}" \
-    | jq -e '.result // .error' > /dev/null
-}
-
-echo "calling tools/list..."
-curl -sS -X POST "http://127.0.0.1:${PORT}/mcp" \
-  -H 'Content-Type: application/json' \
-  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \
-  | jq -r '.result.tools | map(.name) | sort | .[]'
-
-echo "calling each tool..."
-call_tool review          '{"project_root":"/tmp","files":["README.md"],"session_id":"smoke-1"}'
-call_tool debug           '{"project_root":"/tmp","error":"smoke test","session_id":"smoke-1"}'
-call_tool retrospective   '{"session_id":"smoke-1"}'
-call_tool trainer         '{"session_id":"smoke-1"}'
-
-echo "checking brain has _routing entries..."
-sleep 2
-COUNT=$(curl -sS "${BRAIN_URL}/pass-rate?skill=_routing&window=1h" | jq -r '.total // 0')
-if [ "${COUNT}" -lt 4 ]; then
-  echo "FAIL: expected >=4 _routing entries in last 1h, got ${COUNT}"
-  exit 1
-fi
-
-echo "PASS: smoke:routing"