fix: empty templates ship input_schema.json and reference it from actor.json

[DaveHanns]

Summary

Empty templates (ts-empty, js-empty, python-empty) were the only common scaffolding starting points that did not ship a .actor/input_schema.json — and their actor.json didn't carry a .input reference either. Agents extrapolating from these templates produce Actors that rely on the platform's deprecated auto-discovery fallback (see apify-docs input_schema/specification.md line 21).

This PR brings them into line with the start templates (which already ship both files + the linkage) and updates the shared agent-bases/{ts,js,python}.AGENTS.md files so the explicit-reference pattern is taught in the docs that propagate to every per-template AGENTS.md.

Scope

Change	Files
New .actor/input_schema.json starter file	templates/{ts,js,python}-empty/.actor/input_schema.json (3 new)
.actor/actor.json gains "input": "./input_schema.json"	templates/{ts,js,python}-empty/.actor/actor.json (3 modified)
agent-bases/{ts,js,python}.AGENTS.md — Do-list bullet + project-tree annotation	3 modified
Total	9 files (3 new, 6 modified)

Per the README: agent-bases/<lang>.AGENTS.md files propagate to every per-template AGENTS.md via CI, so the 3 base edits lift every template.

Starter input_schema.json content

Each empty template ships:

{
    "$schema": "https://apify.com/schemas/v1/input.ide.json",
    "title": "Actor Input",
    "type": "object",
    "schemaVersion": 1,
    "properties": {
        "example": {
            "title": "Example Field",
            "type": "string",
            "description": "Replace this with your actual input fields.",
            "editor": "textfield"
        }
    },
    "required": []
}

Single placeholder field, no required fields, lowest-friction for agents/users to replace with the real schema.

AGENTS.md changes (applied to all 3 shared bases)

 - set sensible defaults in `.actor/input_schema.json` for all optional fields
+- explicitly reference the input schema from `.actor/actor.json` by adding `"input": "./input_schema.json"` — do not rely on auto-discovery, which is deprecated

Plus the project-structure tree now reads:

.actor/
├── actor.json # Actor config: name, version, env vars, runtime settings, input schema reference
├── input_schema.json # Input validation & Console form definition (referenced from actor.json via "input")
└── output_schema.json # Specifies where an Actor stores its output

Test plan

• CI green (template archives rebuild via the dist/templates/*.zip action)
• apify create -t ts-empty produces a scaffold that includes both .actor/input_schema.json AND .input reference in actor.json
• Same for js-empty and python-empty
• Per-template AGENTS.md files are auto-updated by the CI propagation workflow

Refs

• chocholous/apify-evals F40 (the gap this fixes)
• Companion docs PR: fix: correct actor.json version examples and clarify input schema linkage apify-docs#2662 (academy tutorial + actor.json reference)

🤖 Generated with Claude Code