feat: add persisted S.D.C. combat exchanges

[StreamDemon]

Closes #44

Summary

• Add a persisted two-phase S.D.C. attack/defense exchange with server-owned dice.
• Derive legal melee/ranged defenses and route hits through body pools or artificial S.D.C. armor.
• Add the Ley Terminal command-rail UI with route-safe live Convex feeds.

Rules boundary

• Natural A.R. is not implemented because rendered RUE p.339 says it does not apply in Rifts.
• M.D. weapons and nondepleted M.D.C. protection are refused before rolls or writes.
• Full M.D.C. resolution remains tracked at Full M.D.C. combat: tier interaction, armor ablation, and unprotected outcomes #51.

Verification

• Affected rules, backend, and web package check/test gates pass.
• Root vp check, vp test, and git diff --check pass.
• Live two-dossier miss, defense, hit, M.D.C. refusal, and route-change ownership scenarios pass.

Tracker

• Issue A.R. & armor damage in combat: strike-vs-A.R., armor ablation, the M.D.C. scope decision #44 is aligned to the delivered S.D.C. scope and rendered-page evidence.

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Summary by cubic

Adds a persisted, server-rolled S.D.C. combat exchange with engine-authorized defenses, immutable history, and correct S.D.C→HP routing including Artificial S.D.C. armor A.R. and ablation. Hardens state ownership to reject stale inputs and rule snapshots.

• New Features

  • @riftforge/rules: Derive attack profiles and legal defenses, validate context, resolve strikes and damage, and route S.D.C. through body pools or Artificial S.D.C. armor. Adds combat state tokens and ranged dodge/auto-dodge + minimum strike rules; Natural A.R. excluded per RUE p.339; M.D. weapons and nondepleted M.D.C. protection are refused.
  • Backend (Convex): Adds combatExchanges ledger with indexes and APIs to list targets, declare exchanges, choose defenses, and resolve atomically with server-owned dice and state revalidation. Shares character state helpers and rejects stale rule snapshots and manifest changes.
  • Web: New CombatExchangePanel with route-safe live feeds and telemetry; adds SelectInput and ToggleChip; improves state ownership, clears stale notices, and tweaks semantics for accessibility.

• Migration

  • Apply Convex schema changes (new combatExchanges table and indexes) and redeploy the backend.

^{Written for commit 3b2f008. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 25 files

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