docs(examples): aLora/102_example.py fails with AloraActivationError (stembolts io.yaml has no instruction) #1790

Following the aLoRA README, docs/examples/aLora/102_example.py fails on main with:

AloraActivationError: aLoRA 'stembolts' (base model 'granite-3.3-2b-instruct', qualified
name 'stembolts_alora') never activates for this call: its declared invocation sequence
(49152, 1553, 81, 34775, 49153) is absent from the assembled prompt

The example is skip-marked, so CI never runs it. It is the only example of a custom, non-catalog aLoRA adapter, and docs/examples/aLora/README.md currently describes stembolts_intrinsic.py (the helper it drives) as a runnable version.

Cause

The stembolts io.yaml has no instruction: field. The aLoRA's alora_invocation_tokens decode to <|start_of_role|>check_requirement<|end_of_role|>, which therefore never reaches the prompt, so the activation guard added in #1684 correctly refuses to run it. Catalog adapters get the sequence from an instruction: field in their io.yaml (for example requirement-check).

docs/examples/aLora/io.yaml is byte-identical to the one on nfulton/stembolts, and m alora train defaults its invocation prompt to the same <|start_of_role|>check_requirement<|end_of_role|>. So the README's own train and upload flow produces an adapter that cannot activate.

Evidence

With this added to a copy of the cached io.yaml:

instruction: |-
  <|start_of_role|>check_requirement<|end_of_role|>

the example runs and returns {"defective_part": "Piston Rings", "diag_likelihood": 0.9, ...}. Without it, the error above, identically at the PR #1765 head and on current main (972fa64).

Reproduce (needs uv sync --extra hf):

printf 'The engine sputters at high RPM after sitting overnight.\nOil seepage around the piston rings.\n' \
  | uv run python docs/examples/aLora/102_example.py

To decide

• Add the instruction: field to docs/examples/aLora/io.yaml and the README flow.
• Update nfulton/stembolts on Hugging Face (not something a PR here can change).
• Whether m alora train or m alora upload --io-yaml should add the field automatically, so users training their own adapter don't hit this.
• Whether the example should be un-skipped or covered by a test once it works.

Found while reviewing #1765.