Add context-load/start-claude scripts and clean up CLAUDE.md

context-load walks from cwd upward, loading CLAUDE.md, CONTEXT.md,
MEMORY.md, and BESTPRACTICES.md files with directory trees and git
status. start-claude wraps the claude CLI with --append-system-prompt.

CLAUDE.md: removed Ansible/Helm sections (in best-practices/), folded
Validate Before Deploying into Process Principles, deduped secrets
bullet, fixed best-practices path references.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/start-claude

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# start-claude — Launch Claude Code with pre-loaded project context
+#
+# Runs context-load to gather CLAUDE.md files, directory trees,
+# CONTEXT.md files, cwd markdown, and git status, then passes
+# the result as an appended system prompt.
+#
+# All arguments are forwarded to claude.
+set -uo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+CONTEXT_LOADER="${SCRIPT_DIR}/context-load"
+
+if [[ ! -x "$CONTEXT_LOADER" ]]; then
+    echo "Error: context-load not found at $CONTEXT_LOADER" >&2
+    exit 1
+fi
+
+context="$("$CONTEXT_LOADER")"
+
+if [[ -n "$context" ]]; then
+    exec claude --append-system-prompt "$context" "$@"
+else
+    exec claude "$@"
+fi