Clarify Problem 848 interval bookkeeping

[SproutSeeds]

Summary

• Add an explicit Problem 848 interval bookkeeping authority for public raw 1..10000 vs local ignored 1..40500 rollout evidence.
• Update interval queue, status/frontier surfaces, compact breakpoint metadata, and problem summaries to use that distinction consistently.
• Keep raw exact result packets out of npm package contents while including the small bookkeeping files.

Verification

• node -e 'const fs=require("fs"); for (const p of process.argv.slice(1)) JSON.parse(fs.readFileSync(p,"utf8")); console.log("json ok", process.argv.length-1);' ... => json ok 11
• node src/cli/index.js number-theory status 848
• node src/cli/index.js problem show 848
• node --test test/cli.test.js test/p848-endpoint-menu-compiler.test.js => 75 passed
• npm pack --dry-run --json => 487 entries; exactResultPaths: []; bookkeeping md/json included
• git diff --check
• git check-ignore -v output/p848-exact-small-n-rollouts/EXACT_SMALL_N_1_40500_RESULTS.json