chore(report): add total/results aliases for json output, document deprecation

[coletebou]

Summary

clawpatch report --json returns { findings: <count>, output, items: [...] }. The mixed naming (findings is a number, items is the array) breaks common pipelines like jq '.findings | length'.

This PR adds two additive aliases (no breaking changes):

{
  "findings": 3,        // existing — count, deprecated
  "total":    3,        // new — count, canonical
  "output":   "...",
  "items":    [...],    // existing — array
  "results":  [...]     // new — same array reference
}

results === items (referential equality, not a copy). README marks findings: <number> as deprecated and plans removal in 0.4.

Files

• src/app.ts — 4 lines added to reportCommand's json branch
• src/workflow.test.ts — 3 assertions: total === findings, total === items.length, results === items
• README.md — deprecation note
• CHANGELOG.md — entry

Validation

• pnpm format:check — clean
• pnpm typecheck — clean
• pnpm lint — clean
• pnpm build — clean
• pnpm test — 541 passed, 1 skipped (+3 new)

Notes

Smallest PR in this stack — additive only, no behavior change for existing callers.