feat: initial mosaic bootstrap framework

STANDARDS.md

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+# Mosaic Universal Agent Standards
+
+This file is the canonical standards contract for agent sessions on this machine.
+
+Master/slave model:
+- Master: `~/.mosaic` (this framework)
+- Slave: each repo bootstrapped via `mosaic-bootstrap-repo`
+
+## Execution Model
+
+1. Load this file first.
+2. Load project-local `AGENTS.md` next.
+3. Respect repository-specific tooling and workflows.
+4. Use lifecycle scripts when available (`scripts/agent/*.sh`).
+
+## Non-Negotiables
+
+- Data files are authoritative; generated views are derived artifacts.
+- Pull before edits when collaborating in shared repos.
+- Run validation checks before claiming completion.
+- Avoid hardcoded secrets and token leakage in remotes/commits.
+- Do not perform destructive git/file actions without explicit instruction.
+
+## Session Lifecycle Contract
+
+- Start: `scripts/agent/session-start.sh`
+- Priority scan: `scripts/agent/critical.sh`
+- End: `scripts/agent/session-end.sh`
+- Limitation logging helper: `scripts/agent/log-limitation.sh "Title"`
+
+If a repo does not expose these scripts, run equivalent local workflow commands and document deviations.
+
+## Multi-Agent Safety
+
+- Coordinate through git pull/rebase discipline.
+- Do not auto-resolve data conflicts in shared state files.
+- Keep commits scoped to a single logical change set.
+
+## Prompting Contract
+
+All runtime adapters should inject:
+
+- `~/.mosaic/STANDARDS.md`
+- project `AGENTS.md`
+
+before task execution.