Validate static composition pressure program

[julia-script]

Closes #193

Summary

• adds the canonical and renamed static-composition pressure fixtures, covering nested command data, represented mapped leaves, branch-local transforms, and one normalized action union
• validates evaluator and direct-Wasm behavior while keeping native acceptance in the shared optimized corpus
• adds an opt-in 128-leaf, two-process determinism/characterization benchmark with phase heap samples and LLVM bitcode measurements
• preserves static runner metadata through complete-interface witness wrappers
• syncs the affected main specs and archives validate-static-composition-pressure-program after idempotent parity and archive-integrity checks

Validation

• Standards review: PASS
• Spec/OpenSpec review: PASS
• focused acceptance: 3/3
• shared native corpus: 1/1
• opt-in characterization: 4/4 across two fresh processes
• pnpm typecheck
• pnpm exec biome check .
• pnpm test
• pnpm check
• pnpm release:candidate
• all 109 main OpenSpec specs validate strictly
• archived payload validates strictly; archive is seven R100 renames

openspec validate --all --strict still reports the unrelated pre-existing active change add-silk-documentation-consumers; both specs affected by this PR pass strict validation.

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