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+#!/usr/bin/env bash
+# tools/budget/daily-cost-report.sh — daily cost-monitoring entry point.
+#
+# Wraps snapshot-burn.sh + project-runway.sh + writes the human-readable
+# projection to docs/budget-history/latest-report.md. Designed to be the
+# single entry point for the daily /schedule remote-trigger routine
+# (task #287 visibility surface for the human maintainer).
+#
+# Why this exists (the human maintainer 2026-04-26):
+#   "we need to get that resource/costs monitoring done in the next
+#   few days ... so we can see the costs"
+#
+# The two existing tools (snapshot-burn.sh + project-runway.sh) are
+# correct primitives but require manual orchestration to produce a
+# glanceable surface. This wrapper produces docs/budget-history/
+# latest-report.md so the maintainer can `cat` / preview that one
+# file to see runway state.
+#
+# Usage:
+#   tools/budget/daily-cost-report.sh                  # full run, writes report
+#   tools/budget/daily-cost-report.sh --dry-run        # snapshot dry-run; still
+#                                                     # writes the report from
+#                                                     # whatever snapshots exist
+#   tools/budget/daily-cost-report.sh --skip-snapshot  # only regenerate the
+#                                                     # report from existing
+#                                                     # snapshots (for testing)
+#
+# Exit codes:
+#   0 success
+#   1 if any wrapped step fails (snapshot-burn.sh or project-runway.sh)
+#   2 on CLI-argument errors
+#
+# Composes with:
+#   - tools/budget/snapshot-burn.sh (data-capture primitive)
+#   - tools/budget/project-runway.sh (projection primitive)
+#   - docs/budget-history/README.md (methodology + field reference)
+#   - docs/budget-history/snapshots.jsonl (append-only data store)
+#   - docs/budget-history/latest-report.md (the visibility surface this
+#     wrapper produces; OVERWRITTEN each run, not append-only)
+
+set -uo pipefail
+
+snapshot_args=""
+skip_snapshot="false"
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --dry-run) snapshot_args="--dry-run"; shift ;;
+    --skip-snapshot) skip_snapshot="true"; shift ;;
+    -h|--help)
+      sed -n '2,30p' "$0" | sed 's/^# \{0,1\}//'; exit 0 ;;
+    *)
+      echo "error: unknown argument '$1'" >&2
+      exit 2 ;;
+  esac
+done
+
+script_dir="$(cd "$(dirname "$0")" && pwd)"
+repo_root="$(cd "$script_dir/../.." && pwd)"
+report_path="$repo_root/docs/budget-history/latest-report.md"
+snapshots_path="$repo_root/docs/budget-history/snapshots.jsonl"
+
+# Step 1 — capture snapshot (unless skipped)
+if [ "$skip_snapshot" = "false" ]; then
+  echo "==> snapshot-burn.sh $snapshot_args"
+  if [ -n "$snapshot_args" ]; then
+    "$script_dir/snapshot-burn.sh" $snapshot_args || {
+      echo "error: snapshot-burn.sh failed (exit $?)" >&2
+      exit 1
+    }
+  else
+    "$script_dir/snapshot-burn.sh" || {
+      echo "error: snapshot-burn.sh failed (exit $?)" >&2
+      exit 1
+    }
+  fi
+else
+  echo "==> snapshot-burn.sh SKIPPED per --skip-snapshot"
+fi
+
+# Step 2 — run projection (text mode)
+if [ ! -f "$snapshots_path" ]; then
+  echo "==> project-runway.sh SKIPPED (no snapshots yet); writing bootstrap report"
+  projection="No snapshots captured yet. The first snapshot-burn.sh run will append a baseline row to docs/budget-history/snapshots.jsonl. Once N >= 2 snapshots exist across LFG merges, projection becomes available."
+else
+  echo "==> project-runway.sh"
+  projection="$("$script_dir/project-runway.sh" 2>&1)" || {
+    echo "error: project-runway.sh failed (exit $?)" >&2
+    exit 1
+  }
+fi
+
+# Step 3 — write the report (overwrite, not append)
+ts="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+git_sha="$(git -C "$repo_root" rev-parse HEAD 2>/dev/null || echo unknown)"
+
+cat > "$report_path" <<EOF
+# Latest cost projection — auto-generated
+
+**Generated:** \`$ts\`
+**Factory git SHA:** \`$git_sha\`
+**Source:** \`tools/budget/daily-cost-report.sh\` (wraps snapshot-burn.sh + project-runway.sh)
+
+This file is **OVERWRITTEN** on each daily run. Historical snapshots live in
+\`docs/budget-history/snapshots.jsonl\` (append-only); historical projections
+can be reconstructed from any snapshot subset via \`tools/budget/project-runway.sh\`.
+
+---
+
+## Projection text
+
+\`\`\`text
+$projection
+\`\`\`
+
+---
+
+## How to read this
+
+- **\`Actions billable_ms cumulative\`** — cumulative GitHub-Actions billable runtime across captured snapshots. On public repos this is typically 0 (included minutes); meaningful for macOS / private-repo / Enterprise-plan accounts.
+- **\`Per-PR Actions ms (naive)\`** — rolling-window estimate of per-merged-PR Actions cost. Caveats in the projection text below; treat as proxy until \`N \\geq 3\` cumulative snapshots exist.
+- **\`Actions fit\`** — whether projected Stages 1-4 burn fits the configured free-tier allowance. If \`EXCEEDS\`, the gate-conditions section names escape valves.
+- **\`Copilot projected USD\`** — assumed-30-day span at the current seat count and rate. Re-run with \`--copilot-rate\` to model rate changes.
+
+---
+
+## Source data
+
+- Snapshots: \`docs/budget-history/snapshots.jsonl\`
+- Methodology: \`docs/budget-history/README.md\`
+- Wrapper: \`tools/budget/daily-cost-report.sh\` (this run)
+- Capture script: \`tools/budget/snapshot-burn.sh\`
+- Projection script: \`tools/budget/project-runway.sh\`
+
+EOF
+
+echo "==> wrote $report_path"
+echo "OK: daily cost report regenerated"