feat: surface 17 new commands across cli, grpc, and client libraries

[kacy]

summary

wires up all 17 commands added in prs #315–319 across every surface that didn't have them yet: the cli autocomplete/help system, the grpc api, and all four client libraries (rust, go, python, typescript).

commands covered

command	group
expiretime, pexpiretime, expireat, pexpireat	generic
getset, msetnx	string
getbit, setbit, bitcount, bitpos, bitop	bitmap
smove, sintercard	set
lmpop	list
hrandfield	hash
zmpop, zrandmember	sorted_set

three atomic commits:

• feat(cli) — adds all 17 commands to the autocomplete/help metadata in commands.rs, updates lpop/rpop args to include the optional [count], and introduces the new bitmap group. all 114 cli tests pass.

• feat(grpc) — adds 17 new proto messages (ExpiretimeRequest, BitcountRequest, LmpopRequest/LmpopResponse, ZmpopRequest/ZmpopResponse, etc.), 17 new unary rpcs in the service, pipeline oneof entries 112–128 in PipelineRequest, and response variants 35–36 in PipelineResponse. grpc.rs gets all 17 handler functions following the existing routing pattern.

• feat(clients) — adds typed methods to all four clients. the rust client uses the same cmd2/cmd3/bytes_vec/scored_members helpers as the rest of the file; lmpop and zmpop decode the compound [key, elements] response shape inline. go/python/typescript wrap the generated grpc stubs with idiomatic apis including nullable LmpopResult/ZmpopResult types for the multi-key pop responses.

what was tested

• cargo test -p emberkv-cli — 114 tests pass (includes commands_sorted_within_groups which enforces alphabetical ordering within each group)
• cargo test -p ember-client — all unit and doc tests pass
• cargo build -p ember-server — clean build with all new proto-generated types and handlers