feat: initial mosaic bootstrap framework

adapters/claude.md

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+# Claude Adapter
+
+Use this adapter when running Claude CLI sessions.
+
+## Required Context
+
+1. `~/.mosaic/STANDARDS.md`
+2. `<repo>/AGENTS.md`
+
+## Command Wrapper
+
+Use wrapper commands from `~/.mosaic/bin/` for lifecycle rituals.
+
+## Migration Note
+
+Project-local `.claude/commands/*.md` should call `scripts/agent/*.sh` so behavior stays runtime-neutral.

adapters/codex.md

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+# Codex Adapter
+
+Use this adapter when running Codex CLI sessions.
+
+## Required Context
+
+1. `~/.mosaic/STANDARDS.md`
+2. `<repo>/AGENTS.md`
+
+## Runtime Behavior
+
+- Favor repo lifecycle scripts under `scripts/agent/` for start/end rituals.
+- Keep instructions and quality gates aligned with Mosaic standards.

adapters/generic.md

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+# Generic Adapter
+
+For runtimes without a first-class adapter yet.
+
+## Required Context
+
+1. Load `~/.mosaic/STANDARDS.md`
+2. Load project `AGENTS.md`
+
+## Minimal Contract
+
+- Use `scripts/agent/session-start.sh` at start if present.
+- Use `scripts/agent/session-end.sh` before completion if present.
+- If missing, run equivalent repo commands and report what was executed.