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

src/load-contracts.sh

@@ -33,6 +33,14 @@ for f in $FILES; do
     printf '\n' >> "$TEMP"
 done
 
+# Agent identity (M13): when the launcher names the agent, the generated
+# prompt states it - SOUL.md provides the persona, this provides the name.
+if [ -n "${MOSAIC_AGENT_NAME:-}" ]; then
+    printf '===== AGENT IDENTITY =====\n' >> "$TEMP"
+    printf 'agent name: %s\n' "$MOSAIC_AGENT_NAME" >> "$TEMP"
+    printf '\n' >> "$TEMP"
+fi
+
 # Sanctioned mission injection point (M4): when the task runner provides a
 # mission snapshot, its objective and directives are appended AFTER the
 # immutable contracts. Runtime data; never part of the contract fixtures.