Include-only Dependency Tree (Phase 0)

Goal

Build a dependency tree using only Ny (no Array/Map), scanning source text for include "...", and output stable JSON.

Scope (Phase 0)

Only include is supported. using/module/import are out of scope.
Runner bridge: NYASH_DEPS_JSON=<path> is read and logged only (no behavior change).

Tool

apps/selfhost/tools/dep_tree_min_string.hako
- Recursively reads source files, scans for include "path" outside of strings and comments.
- Comments: // and # (line comments) are ignored.
- Strings: "..." with \" escapes are honored.
- Cycles: detected via a simple stack string; when detected, the child appears as a leaf node with empty includes/children.

Output format

{ "version": 1,
  "root_path": "<entry>",
  "tree": {
    "path": "<file>", "includes": ["..."], "children": [ <node> ]
  }
}

Acceptance criteria

Running make dep-tree produces tmp/deps.json whose first non-empty line starts with { and conforms to the format above.
The scanner does not pick includes inside strings or comments.
Cycles do not crash or loop; the repeated node is represented as a leaf.

Examples

Root: apps/selfhost/smokes/dep_smoke_root.hako (includes dep_smoke_child.hako)
Cycle: apps/selfhost/smokes/dep_smoke_cycle_a.hako ↔ dep_smoke_cycle_b.hako

Validation (examples)

echo apps/selfhost/smokes/dep_smoke_root.hako | ./target/release/nyash --backend vm apps/selfhost/tools/dep_tree_min_string.hako
make dep-tree