RSI agent redesign: Phase 1 (JIT context, budget/scheduling, model routing)

[ronshapiro]

Summary

• Adds RSIAgentRedesignPlan.md, a redesign of the RSI content-agent architecture informed by PR RSI Phase 2: agentic Rashi/Tosafot translation task type #54's real-run retrospective (context wandering costing $0.73/call, uncontrolled model selection, no budget pacing, no review gate).
• Also merges in PR RSI Phase 2: agentic Rashi/Tosafot translation task type #54's Phase 2 code (rashi_tosafot_translation.ts, headless_claude.ts, etc.) as a foundation, since this branch previously only had Phase 1.
• Implements Phase 1 of the redesign plan on top of that:
  • JIT context: context_fetch.ts/context_fetch_cli.ts replace raw Read/Grep/Glob access to the full cached page file with a narrow, ref-addressed, size-capped tool; page_skeleton.ts provides a compact page structure for the prompt instead of the raw 400KB+ JSON; worked examples are now inlined in the generation prompt.
  • Dependency tracking: generation records' dependsOn is now auto-populated from what context_fetch actually served (via extractRequestedRefs), not always [] — this is what lets Tier 3 staleness hits cascade to dependent artifacts.
  • Model routing: model_routing_config.json (read via model_routing.ts) replaces the hardcoded model constant.
  • Budget/scheduling: budget_config.json (hand-edited, ships fully disabled) + schedule_runner.ts (bounded per-tick runner) + status_cli.ts (call-count/cost visibility) — a human-driven schedule rather than a blind cron or a dollar-cap that may not mean anything under subscription billing.
• Not yet implemented: the in-page review UI (Phase 3) and the segmentation-boundary audit task type (Phase 2) — see the plan doc for phasing.

Test plan

• npx jest — all 85 suites / 823 tests pass
• npx tsc (project's pre-commit check) — clean
• npx eslint on all changed files — no errors (only pre-existing no-console warnings on CLI scripts, matching existing convention)
• Smoke-tested context_fetch_cli.ts, status_cli.ts, and schedule_runner.ts via ts-node against real local state

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