feat: initial mosaic bootstrap framework

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.