docs: map Bible read cache for agents

[cameronapak]

Docs-only follow-up for YPE-5453 / #371. No runtime, test, or changeset changes. Does not implement YPE-5262.

Why

An agent should read AGENTS.md then docs/bible-read-cache.md and know who owns GET, which files to touch, what remount must do, and that Expo disk cache is a different ticket.

What this adds

• docs/bible-read-cache.md: tower, opt-in list, remount contract table, fence, file ownership, agent control.
• Root AGENTS.md: Domain pointer to the map.
• CONTEXT.md: opted-in Bible read, remaining lifetime, CachePolicy, getWithPolicy, memory-only (plus remount / still-mounted observer).
• ADR 0006: a How to navigate block. The ADR stays the why. The map is the how and where.
• packages/core/AGENTS.md: CachePolicy / getWithPolicy. GET stays body-only.
• packages/hooks/AGENTS.md: map pointer plus a 5-row remount contract table.
• docs/testing.md: remount tests stay in hooks; core owns the parseCachePolicy table.

Fence (repeated in the map, CONTEXT, core, hooks, ADR)

• Do not use this layer as the React Native Expo disk cache.
• Do not persist QueryClient.
• Do not share one QueryClient across Expo WebViews.
• Do not wrap window.fetch in the Web SDK to close YPE-5262.

Verification

git diff against this branch is markdown only. No .ts, .tsx, or changeset files.

  

[changeset-bot]

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Latest commit: 85e866b

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