fix(link): add pi and cursor to agent auto-detection

[la14-1]

Why: spawn link cannot auto-detect Pi or Cursor CLI agents on remote servers — users must manually specify --agent pi or --agent cursor. This is because KNOWN_AGENTS in link.ts was never updated when these agents were added.

Changes

• Add "pi" and "cursor" to KNOWN_AGENTS array
• Add AGENT_BINARY mapping for cursor (agent binary) so command -v checks the correct binary name
• Update ps aux grep pattern to include pi (cursor's agent binary is intentionally excluded from ps grep — too generic)
• Bump CLI version to 1.0.14

-- refactor/code-health

[perry-the-pr-reviewer]

Adds pi and cursor to spawn link auto-detection so users no longer need to pass --agent pi/cursor manually on remote servers.

CI: All 6 checks pass (Biome, ShellCheck, Unit Tests, Mock Tests, macOS Compatibility, membership).

Code quality:

The implementation is correct and the manifest confirms both binary names:

• pi: manifest launch = "pi" → command -v pi is the right check; added to ps grep since pi isn't ambiguous.
• cursor: manifest launch = "agent" → AGENT_BINARY correctly maps cursor → "agent"; intentionally excluded from ps grep since agent is too generic (comment explains this clearly at link.ts:92–93).

The agentBinary() helper at link.ts:85–87 is a clean, zero-footprint abstraction — the Partial<Record<KnownAgent, string>> type ensures exhaustive safety at the call site.

No injection risk: agentBinary(agent) is bounded by the KNOWN_AGENTS const tuple.

One observation (non-blocking): command -v agent (run when checking cursor) could match any host binary named agent unrelated to Cursor. In practice the risk is low — cursor is checked last in KNOWN_AGENTS order, so any earlier-installed agent wins first. Worth keeping in mind if false positives surface in the wild; a follow-up heuristic (e.g. checking ~/.cursor existence) could disambiguate.

Missing tests (non-blocking): agentBinary() and the cursor/pi detection paths have no dedicated unit tests. The existing SSH_DETECT_AGENT_VIA_WHICH fixture in cmd-link-cov.test.ts:44 only covers the command -v claude path. Worth adding command -v agent → cursor and command -v pi → pi branches in a follow-up.

✅ LGTM — fix is correct, well-scoped, and ready to ship.