feat: add /claude-prime — start 5h quota windows right after reset

Adds an opt-in PrimeManager that fires one minimal claude-haiku-4-5
request (~20 input tokens) about a minute after an account's 5h quota
window resets, so the window starts immediately instead of lagging
until the user's first real prompt.

- Cross-process single-fire via atomic wx marker files; markers are
  namespaced per account-storage fingerprint (realpath sha256/12) so
  multiple configs on one machine prime independently
- Keyed manager registry: one PrimeManager per (process x storage
  fingerprint); plugin reloads adopt and rebind injected seams,
  path changes stop and evict the old manager
- Self-healing bootstrap for idle accounts with no persisted resetsAt,
  throttled and sentinel-guarded against cross-process amplification
- Freshness contract: prime decisions only on network-fetched quota
  ({ quota, fetched }), never re-stamped cache
- /claude-prime command (opencode modal + Pi display-only), sidebar
  status rows, per-account usage counters in runtime state
- Killswitch-aware (model-scoped thresholds apply to the haiku probe)

Author: iceteaSA

packages/core/src/accounts.ts

@@ -14,6 +14,7 @@ export * from './logger.ts'
 export * from './logging.ts'
 export * from './models.ts'
 export * from './pkce.ts'
+export * from './prime.ts'
 export * from './provider.ts'
 export * from './quota-manager.ts'
 export * from './quotas.ts'

packages/core/src/index.ts

@@ -1,6 +1,24 @@
 export const CLAUDE_FABLE_5_MODEL_ID = 'claude-fable-5'
 export const CLAUDE_MYTHOS_5_MODEL_ID = 'claude-mythos-5'
 
+/**
+ * Haiku 4.5 model identifier used by `/claude-prime` to start each OAuth
+ * account's five-hour quota window with a minimal request (~20 input + 1
+ * output tokens). Kept distinct from the Fable/Mythos pricing block above so
+ * per-million-token cost estimation for prime does not conflate families.
+ */
+export const CLAUDE_HAIKU_4_5_MODEL_ID = 'claude-haiku-4-5'
+
+/**
+ * Per-million-token USD pricing for Haiku 4.5. Used to project the cumulative
+ * cost of prime requests from persisted usage counters — never persisted on
+ * disk; derive at display time so future pricing revisions land in one place.
+ */
+export const CLAUDE_HAIKU_4_5_PRICING = {
+  input: 1,
+  output: 5,
+} as const
+
 export const CLAUDE_FABLE_MYTHOS_5_MODEL_IDS = [
   CLAUDE_FABLE_5_MODEL_ID,
   CLAUDE_MYTHOS_5_MODEL_ID,