perf: index law dispatch by canonical structure

[akcorca]

Closes #190

Summary

• compile immutable root/mandatory-structure keys for every canonical law form
• dispatch only structurally compatible candidates while retaining an explicit fallback for undiscriminated variadic forms
• keep exhaustive unification as a test oracle and prove candidate completeness across all compiled forms
• add pure 100- and 500-pack scale tests plus a 20-rule-per-document budget
• remove the production exhaustive scan and its legacy-audit finding

Results

• the 61-document fixture drops rule visits from 2,240 to 950 (57.6%)
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace (125 tests)
• bun run typecheck and bun test
• bun run legacy:audit (only v0.19 4/6: Centralize meaning decisions and resolution plans #191 remains)
• awiki lint
• 501-document local timing remained well below latency limits; Apple Silicon RSS is diagnostic per policy and the Linux CI gate is authoritative

Release WASM was rebuilt on the designated x86_64 Linux builder.

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