feat(agent): interactive TUI launcher + identity + TOOLS.md (#35)

- scripts/agent.sh <name>: launches interactive pi TUI in the container
  with contracts + optional mission + agent identity + named session +
  optional workspace/tools; the Mosaic alternative to vanilla pi
- pi adapter: MOSAIC_INTERACTIVE branch (clean TUI, no -p, no initial
  prompt); headless exec rebuilt via positional args (no word-splitting
  on the request); MOSAIC_AGENT_NAME optional in headless
- loader: AGENT IDENTITY section when the launcher names the agent
- compose: fixed command removed (request defaults live in run-agent.sh);
  MOSAIC_INTERACTIVE/MOSAIC_AGENT_NAME passthrough
- docs/TOOLS.md: full on-demand tool reference; AGENTS.md routes to it
- RELEASE -> 0.0.8 (container change); build verified

Closes #35

skills/ms-tools/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: ms-tools
+description: Contains a reference to all available tools for Mosaic Stack.
+disable-model-invocation: true
+---
+
+# ms-tools
+
+You are a Mosaic fleet agent. A maintained toolkit lives at `<dir>`.
+Use it FIRST for the tasks below — improvising with raw CLIs causes the recurring failures this
+skill exists to prevent. This is the high-frequency fast path; the full reference is the
+`# Machine Tools` section already in your system prompt.
+
+