refactor(vocabulary): remove legacy graph contract aliases

[aaltshuler]

Summary

• cut public Rust, HTTP/OpenAPI, CLI JSON, human output, diagnostics, and docs over to one canonical graph vocabulary
• remove the retired table/row/manifest aliases instead of dual-emitting them
• distinguish graph-manifest coordinates from published/native Lance dataset coordinates throughout the contract
• regenerate the exact four-surface vocabulary inventory with zero legacy or compatibility-alias entries

Compatibility

This is an intentional pre-1.0 breaking change. The v0.10 CLI, server, and Rust SDK must be upgraded together. Retired request fields and CLI flags are rejected or absent; old public Rust names and DTO fields are removed.

Persisted manifest columns, recovery grammar, Lance layout, query-result rows/columns, and exact upstream/internal identifiers are unchanged. Legacy cluster observation records are canonicalized on read so cluster status cannot re-emit a retired public key.

Stack

Draft, stacked on #534 (codex/vocabulary-openapi-guard). Merge only after its base lands.

Verification

• cargo test --workspace --locked --features omnigraph-engine/failpoints,omnigraph-cluster/failpoints
• cargo clippy --workspace --all-targets --locked -- -D warnings -W clippy::dbg_macro
• cargo clippy --workspace --all-targets --locked --features omnigraph-engine/failpoints,omnigraph-cluster/failpoints -- -D warnings -W clippy::dbg_macro
• exact vocabulary guard: 1,104 current / 1,464 base observations; zero legacy misuse and zero compatibility aliases
• OpenAPI: 102 tests green, including typed export JSON rejection lanes (400/413/415)
• cargo fmt --all --check
• git diff --check
• bash scripts/check-agents-md.sh
• actionlint .github/workflows/ci.yml
• shellcheck scripts/*.sh