docs: add agent bootstrap and contract read router

AGENT-BOOTSTRAP.md

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+# Agent Bootstrap
+
+Read this file first when `bible/` is attached as a submodule.
+
+Do not read the whole repository by default. This repository is a rule library, not a codebase.
+Use targeted reading.
+
+## Reading Order
+
+1. Read this file.
+2. Read `bible-local/README.md`.
+3. Read only the relevant files in `bible-local/architecture/` and `bible-local/decisions/`.
+4. Read only the relevant shared contracts in `bible/rules/patterns/`.
+
+If you are editing this `bible/` repository itself, read the target contract and its nearby
+`README.md`. Do not walk all contracts unless the task is explicitly about restructuring the library.
+
+## Always-On Contracts
+
+Read these on most tasks:
+
+- `bible/rules/patterns/kiss/contract.md`
+- `bible/rules/patterns/task-discipline/contract.md`
+- `bible/rules/patterns/testing-policy/contract.md`
+- `bible/rules/patterns/secret-management/contract.md`
+- `bible/rules/patterns/go-code-style/contract.md`
+
+## Task Router
+
+Read additional contracts by task type:
+
+- HTTP handlers, JSON APIs, status codes:
+  `go-api`, `go-background-tasks`, `go-logging`
+- DB queries, migrations, backups, startup DB safety:
+  `go-database`, `backup-management`
+- Local-first desktop migration/recovery:
+  `local-first-recovery`
+- Tables, bulk actions, filters, pagination:
+  `table-management`, `controls-selection`
+- Forms, validation, modals:
+  `forms-validation`, `modal-workflows`
+- Import/export, CSV, upload batching:
+  `import-export`, `batch-file-upload`
+- Build/deploy/runtime packaging:
+  `app-binary`, `build-version-display`, `module-versioning`
+- LiveCD/OpenRC/boot-time services:
+  `alpine-livecd`, `unattended-boot-services`, `vendor-installer-verification`
+- Release authenticity / signed binaries:
+  `release-signing`
+- Identifiers, vendors, data normalization:
+  `identifier-normalization`, `no-hardcoded-vendors`
+- Project architecture documentation rules:
+  `go-project-bible`
+
+## Default Rule
+
+If a contract is not clearly relevant to the current task, skip it.
+Prefer reading one correct contract fully over skimming twenty unrelated ones.