chore(knip): remove dead barrel files + silence knip false-positives

[BigSimmo]

Summary

Conservative first pass on the knip baseline shipped in #636 (the advisory check:knip gate stays advisory — nothing is promoted to a required gate).

• Remove src/components/clinical-dashboard/index.ts + ClinicalDashboard.tsx — vestigial re-export barrel/shim left over from the dashboard decomposition, with zero importers (the real component is src/components/ClinicalDashboard.tsx, imported directly). Clears knip's "Unused files".
• Declare @babel/parser as an explicit devDependency, pinned to ^7 to match the version the AST tests (architecture-boundaries, client-secret-surface, clinical-dashboard-merge-artifacts) already use — v8 drops the "importAttributes" plugin those tests pass. Clears knip's "Unlisted dependencies".
• Add railway to knip ignoreBinaries (used by scripts/check-env-parity.mjs). Clears knip's "Unlisted binaries".

The remaining ~179 unused exports / ~72 exported types are intentional public-API / barrel surfaces that need per-item human judgment — deliberately not bulk-removed (per the repo's "triage, not automatic delete list" stance).

Verification

• ✅ test — 247 files / 2301 tests pass, 0 failures (incl. the 3 @babel/parser AST tests, 17/17)
• ✅ typecheck, lint — clean; format:check clean on changed files
• ✅ knip — file / dependency / binary noise resolved; only the (intentional) export triage remains

Clinical Governance Preflight

N/A — dead-code removal + tooling config only; no ingestion, answer generation, search, privacy, or clinical output touched.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores

  • Updated project analysis settings to reduce false-positive findings.
  • Refined internal component organization and exports for improved maintainability.
  • Added tooling support for more reliable code analysis.

• User Impact

  • No user-facing functionality or interface changes are included in this update.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0696ded and 2d6368e.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (4)

• knip.json
• package.json
• src/components/clinical-dashboard/ClinicalDashboard.tsx
• src/components/clinical-dashboard/index.ts

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/knip-cleanup

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