SKILL.md becomes a two-line shim: run render.py, follow the instruction
it prints to stdout. render.py emits the read-and-follow line on
success, HALT-and-report on failure. Progress chatter moves to stderr.
This removes the skill-dir and project-root tokens from SKILL.md — per
Anthropic skills spec, script output is the defined channel for agent
communication, and no public skill in the reference set uses template
tokens for path resolution.
Adds TPL-01 to the deterministic validator: files whose name contains
template must not contain compile-time double-curly substitutions.
Template files seed durable, version-controlled artifacts (spec files)
that execute on other machines; baking a value at render time would
freeze a machine-local path into every downstream artifact.
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