Deduplicate entry points and templates

CLAUDE.md and AGENTS.md (now a symlink) shrink to a pointer at the
bootstrap, which absorbs the rule-editing instructions. The two
identical per-tool templates merge into rules/ai/AGENT.template.md.
README drops the read path duplicated from the bootstrap. The
web-visual-baseline starter CSS/HTML duplicated assets/view.css and is
removed in favor of the vendored assets.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

AGENT-BOOTSTRAP.md

@@ -12,9 +12,16 @@ Use targeted reading.
 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/`.
 
+## Editing This Repository
+
 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.
 
+- Edit the relevant existing contract, or create a new `rules/patterns/<topic>/contract.md`.
+- Normative rules go in `contract.md`; examples and rationale go in the pattern's `README.md`.
+- Do not create rules outside `rules/patterns/`. Do not expand scope beyond engineering rules and patterns.
+- Run `sh scripts/lint.sh` after changes.
+
 ## Always-On Contracts
 
 Read these on most tasks: