The sequence table is no longer hand-maintained Rust: keytips.json is the
single human-edited source (one line per sequence, grouped by tab, pending
reserves sequences for future commands), and `cargo xtask keytips`
regenerates keytip_table/generated.rs deterministically. `cargo xtask ci`
now fails if the generated table is stale.
- Action::Pending: reserved sequences show their badge and invoke silently
until the command exists (bind-all policy).
- Intermediate group levels are implicit: the matcher waits whenever a
pressed letter starts a deeper sequence; only terminal entries are
listed (two-letter units like Draw's "JI" work with no extra rows).
- First populated sequence beyond the legacy set: W,V,G toggles gridlines,
proven end-to-end by view_gridlines_sequence_runs_end_to_end.
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