Harvest: launcher and input (rod #1221, #1176, #1233, #1220) #51

Parent

Spec: #33 (Baseline release). Section numbers refer to its Implementation Decisions.

What to build

Attaching to a running browser no longer leaks a goroutine or hangs cleanup, ResolveURL errors on a non-200 version endpoint, FreeBSD binary paths are looked up, and multi-byte keys type. These touch the launcher after its rewrite and the guard, so they land on top of both. Spec sections 10 and 11.

Acceptance criteria

• fix: close exit channel in Launch method to prevent goroutine leaks go-rod/rod#1221: the exit channel is closed when Launch attaches to a browser already listening; the tests are rewritten on ephemeral ports (launch one browser, attach a second launcher to its port) and verified under the Orphan guard.
• Fix ResolveURL using default proxy go-rod/rod#1176: ResolveURL returns an error for a non-200 /json/version; the live-proxy test is replaced by an ephemeral HTTP server answering 502.
• fix(browser): add FreeBSD support go-rod/rod#1233: FreeBSD entries in the binary-path and discovery lists (Tier 3, no promise); a table-driven lookup test covers them (rod #828 Confirmed fix by that test).
• fix(printable-fix) allow using multiByte chars go-rod/rod#1220: Key.Printable counts runes; the PR's test passes.
• Each commit names the upstream pull request and its author; proof runs on the Snapshot recorded for #1221, #1176 and #1220.

Blocked by

• Browser resolution: system browser first, WAND_BROWSER_* and platform errors #45 (Browser resolution: system browser first, WAND_BROWSER_* and platform errors)
• Orphan guard replaces leakless #46 (Orphan guard replaces leakless)