feat(mana-ai): first live reminder producers — token budget + retry-loop

Wires the M1 reminderChannel into the mana-ai mission runner with two
initial producers in services/mana-ai/src/planner/reminders.ts:

- tokenBudgetReminder — warns at 75% of the agent's daily cap, emits a
  stronger "wrap up NOW" message at/above 100%. Uses pretick usage +
  accumulated round usage so the warning tracks drift during a long
  plan.
- retryLoopReminder — shape is in place (round≥3 + last 2 failures),
  currently limited to the single lastCall LoopState exposes. Extends
  cleanly once LoopState carries the full failure window.

buildReminderChannel composes active producers; the tick hoists
pretickUsage24h so the channel has the baseline. Each round the loop
re-evaluates the producers, so usage drift across rounds surfaces on
the NEXT turn.

Also exports LoopState + ReminderChannel from @mana/shared-ai top-level
so consumers don't need to reach into /planner.

Tests: 13 new bun tests covering thresholds, pretick+round summing,
composition, and per-round re-evaluation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shared-ai/src/index.ts

@@ -67,12 +67,14 @@ export type {
 	LlmCompletionRequest,
 	LlmCompletionResponse,
 	LlmFinishReason,
+	LoopState,
 	LoopStopReason,
 	ParseResult,
 	PlannedStep,
 	PlannerLoopInput,
 	PlannerLoopResult,
 	PlannerMessages,
+	ReminderChannel,
 	ResolvedInput,
 	SystemPromptInput,
 	SystemPromptOutput,