ADR-0046 — Industry Demo Suite runner.
Adds `evals/industry_demos/run_all.py`, the single-entry-point script
that executes all three falsifiable demos in sequence, collects their
structured JSON evidence, and exits 0 iff every demo passes.
Design choices:
- Runs each demo in an isolated try/except so a crash in demo_01 does
not suppress evidence from demo_02 and demo_03 (fail-open evidence
collection, fail-closed exit code).
- Prints a human-readable banner + structured JSON evidence per demo.
- Prints a final machine-readable JSON summary `{"all_passed": bool,
"results": [...]}` on stdout for CI consumption.
- Exits 0 when all_passed, 1 otherwise.
- Zero new dependencies: only stdlib + the same imports each individual
demo already uses.
Also updates `evals/industry_demos/__init__.py` to document the new
runner in the module docstring.
Verification path:
python -m evals.industry_demos.run_all
echo $? # 0 on full pass
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