fix(dial): bare-nick dial surfaces the same unsendable reason wire send emits

[laulpogan]

What

A peer can be pinned in trust yet unsendable: its relay endpoint's slot_token stays empty until the peer's pair_drop_ack lands (common right after pairing, an MCP/daemon restart, or when we're not federation-reachable so the ack can't arrive). wire send already classifies this and returns an actionable peer_unknown reason — but both dial surfaces short-circuited a pinned peer to a bland already_pinned with no sendability check.

Result: an operator/agent whose sends were bouncing peer_unknown would re-dial the bare nick forever, seeing a reassuring already_pinned each time and never the real cause. (This is the exact loop a real cross-machine session hit — bare-nick re-dial → already_pinned → send → peer_unknown, repeat.)

Fix

Extract one shared classifier send::unsendable_reason(peer) -> Option<String> (None = a usable route exists; Some = the same reason string the send path emits) and route all three surfaces through it so they can't drift:

• delivery_json PeerUnknown arm now calls it — output preserved exactly.
• cmd_dial (CLI) PinnedPeer arm pushes a warning step when unsendable; the human printer shows the detail inline (WARN: …) instead of a bare warning label.
• tool_dial (MCP) PinnedPeer arm adds sendable: bool + an optional reason. status stays already_pinned — additive, no consumer break.

The classifier mirrors the send loop's routability exactly:

• an HTTP endpoint counts only when relay_url + slot_id + slot_token are all non-empty (matches the send loop's continue skip — a token on a malformed endpoint is not a route);
• a peer reachable only over Nostr (recorded nostr_transport + a local nostr key, the RFC-007 D3 fallback) reads as sendable, so the dial warning never contradicts what a wire send would actually do.

Tests

send::unsendable_reason_reads_live_state covers: not-pinned → Some; usable HTTP slot → None; pinned-but-empty-token → Some("no token yet"); Nostr-reachable → None; malformed endpoint (token but empty relay_url/slot_id) → Some. Full lib suite: 611 pass, fmt + clippy -D warnings clean.

🤖 Generated with Claude Code

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