fix(plugin): avoid high compression silence fixture

[miguel-heygen]

Summary

• Fixes Installation fails due to compression ratio check on silence.wav #1716 by keeping the Claude plugin payload below the installer's suspicious compression-ratio guard.
• Preserves the existing missing-host-comp-id WAV decoded PCM exactly, then appends a deterministic ignored JUNK chunk so archive compression drops below the 50:1 threshold.
• Adds a script-level regression test for plugin payload files that must stay under the install guard.

Validation

• node --import tsx --test scripts/claude-plugin-compression.test.ts
• bun run build:hyperframes-runtime
• bun run --filter @hyperframes/producer test -- missing-host-comp-id --sequential
• ./node_modules/.bin/oxfmt --check package.json scripts/claude-plugin-compression.test.ts
• ./node_modules/.bin/oxlint scripts/claude-plugin-compression.test.ts
• Pre-commit: lint, format, typecheck, commitlint

Notes

• Verified the current fixture ratio is ~23.0:1, down from ~68.6:1.
• Verified decoded PCM SHA256 matches origin/main, so render/audio semantics are unchanged.
• Local full bun run test:scripts is blocked on Node 18 by existing script-test imports using import.meta.dirname; the new compression test passes standalone and inside that run before unrelated script-test boot failures.