feat: deepen English semantic declarations

[akcorca]

Outcome

Completes the English semantic-declaration slice of v0.15 and establishes the larger recognition corpus as a release gate.

• grows checked-in synthetic English prose from 60 to 180 cases;
• adds 120 distinct topics across mathematical, scientific, and engineering writing;
• recognizes all 15 original English coverage targets;
• supports exact two- and three-symbol mappings with respectively and in that order;
• supports shared two- and three-symbol declarations without guessing ambiguous mappings;
• adds direct, imperative, contextual, write ... for, and := ... defines declaration families;
• preserves mismatched-arity, modal, conditional, negated, malformed, and forward-reference refusals;
• keeps matching/splitting policy in pure functions and adds one representative LSP journey;
• adds all 180 cases to native/release-WASM exact parity.

Current prose score: 180 cases, 101 recognition cases, 49 refusals, 15/30 coverage targets supported (88.5%).

Verification

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace
• bun run typecheck
• bun test
• bun run corpus:synthetic
• bun run parity
• bun run package:smoke

Closes #123

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