docs: align streaming ms_of_day label and document json-raw format

[userFRM]

Two documentation label-accuracy fixes for the streaming surface and the CLI.

Streaming ms_of_day label

The streaming ms_of_day field was documented as "exchange-local" in the Rust event structs and FFI structs but "Eastern Time" on the docs page and in every tick schema. Same field, two labels. The field is an unconverted i32 that already carries Eastern Time (US exchange-local time equals ET), so this is a wording fix with no behavioral or data change. All four surfaces now read "Milliseconds since midnight Eastern Time".

The FFI struct comment is emitted by the schema-driven generator, so the correction lives in the emitter source and the checked-in generated file was regenerated from it. The generated-file consistency check passes.

CLI --format json-raw

The CLI accepts four --format values — table, json, json-raw, csv — but the docs and README enumerated only three, leaving json-raw undiscoverable. json-raw is output-significant: it emits dates as raw YYYYMMDD integers (and ms_of_day as raw milliseconds) instead of the ISO-formatted values json produces. Added it, with a short note on its semantics, to both docs-site/docs/cli.md and tools/cli/README.md. The CLI's own inline --format help already enumerated json-raw with its semantics, so no code change was needed there.

Verification

• cargo fmt --all -- --check clean
• cargo build -p thetadatadx and -p thetadatadx-ffi build
• generate_sdk_surfaces --check and generate_docs_site --check both report generated files match
• python3 scripts/check_docs_consistency.py reports ok
• No exchange-local string remains anywhere in the repo

🤖 Generated with Claude Code