wboayue / rust-ibapi / 26546040726

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contracts: add Client::smart_components API (#652)

* contracts: add Client::smart_components API

Maps a BBO exchange code (e.g. "ISLAND") to underlying contributing
exchanges with bit position, full name, and single-letter abbreviation.

Uses request_helpers::one_shot_request_with_retry per the fundamental_data
precedent (#647). Registers IncomingMessages::SmartComponents in the
request-id routing allow-list (rule 17).

* examples: register smart_components + default to "a6"

[[example]] entries make `cargo run --example {async_,}smart_components`
work. Default arg flipped from ISLAND (rejected by TWS with error 321)
to "a6" — the canonical sample value from the IBKR Python testbed and
the live BBO token returned by smoke against paper gateway 220.

* smart_components: drop dead request_id from response builder + doc cleanup

/simplify findings:
- SmartComponentsResponse.request_id field + setter were never read.
  Decoder discards p.req_id; routing happens via proto envelope before
  the decoder runs. Drop the field; SmartComponentsResponse now derives
  Default and smart_components() takes no args.
- Replace remaining "ISLAND" references in rustdoc + struct doc with the
  working "a6" token surfaced by the live smoke. Reflect the per-session
  token nature in the arg description.

117 of 121 new or added lines in 6 files covered. (96.69%)

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