feat: live statusline via shepherd watch - #11
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Opt-in config.watch streams `shepherd watch` (NDJSON, board-scoped) and refreshes counts on every change, so TUI/external edits update the statusline without waiting for FocusGained. Re-scopes on board switch; stops on VimLeavePre.
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The on_exit closure cleared the shared watch_job unconditionally. A restart kills the old job, starts the new one, and the old job's exit callback then lands and nils out the *new* handle — so a second board switch never restarted the stream (the statusline kept watching the previous board and served a stale count), and VimLeavePre saw no handle to kill, orphaning `shepherd watch` on every exit. Compare identities before clearing, and report a nonzero exit of the current job — an older shepherd without the `watch` verb used to fail silently.
Live counts are what a statusline is for; opt-in meant most installs sat on FocusGained-only refreshes without knowing there was anything better. Gated on `vim.fn.executable`, because on by default a missing binary would otherwise throw ENOENT out of setup() on every startup instead of staying a `:checkhealth` problem.
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Opt-in
config.watch = truestreamsshepherd watch(NDJSON, board-scoped) and refreshes the statusline counts on every board change — from the TUI or another process — instead of only onFocusGained.VimLeavePre.false(no background process unless asked).