chore(terminology): complete prose sweep in docs/examples/ and Python docstrings (#1192 follow-up)

[planetf1]

Epic: #929 | Parent issue: #1192 (swept in PR #1256)
Sequencing: No hard technical dependency — can land any time after Phase 1 settles to avoid terminology churn. Exception: docstrings on _generate_from_intrinsic() (marked Out of scope below) travel with the Phase 1 symbol rename in #1136 and must not be swept here.

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PR #1256 swept docs/docs/, AGENTS.md, the five Phase 0 Python files, and all backend Python files already in the diff. Two areas were intentionally deferred to keep the PR stable for review:

1. docs/examples/ — prose terminology

These files were not touched by PR #1256 but contain the same old vocabulary:

File	Line	Current text	Should be
docs/examples/intrinsics/README.md	1,3,7	"Intrinsics Examples", "intrinsic functions"	"Adapter Functions Examples", "adapter functions"
docs/examples/granite-switch/README.md	3,29,36,57	"intrinsics" prose, [Intrinsics Documentation] link	"adapter functions", [Adapter functions Documentation]
docs/examples/granite-switch/answerability_openai.py	3	"answerability intrinsic"	"answerability adapter function"
docs/examples/granite-switch/manual_adapter_loading.py	75	"use the intrinsic as usual"	"use the adapter function as usual"
docs/examples/aLora/README.md	35, 144	"upload your model as an intrinsic", "custom intrinsic adapter"	"adapter function"
docs/examples/groundedness_requirement_example.py	8	"citations intrinsic"	"citations adapter function"
docs/examples/tools/README.md	18, 23	"HuggingFace's smolagents", "HuggingFace ecosystem"	"Hugging Face"
docs/examples/tools/smolagents_example.py	2, 11	"HuggingFace smolagents", "HuggingFace ecosystem"	"Hugging Face"
docs/examples/aLora/README.md	66, 87	"HuggingFace model repository", "HuggingFace repo"	"Hugging Face"
docs/examples/sessions/README.md	91	# HuggingFace	# Hugging Face
docs/examples/granite-switch/manual_adapter_loading.py	12, 58	"HuggingFace Hub"	"Hugging Face Hub"
docs/examples/groundedness_requirement_example.py	14, 32, 33	"HuggingFace backend"	"Hugging Face backend"

Note: --intrinsic CLI flag, stembolts_intrinsic.py filename, from mellea.stdlib.components.intrinsic import paths, and HuggingFaceTB/ org names in model IDs are all out of scope — leave unchanged.

2. Python docstrings/comments in files not in PR #1256

All are "Hugging Face" brand name corrections (not core terminology). 17 occurrences across 9 files:

File	Occurrences
mellea/backends/backend.py	1
mellea/backends/tools.py	2
mellea/backends/cache.py	2
mellea/backends/model_ids.py	2 (not lines 293/298 — those are org names in repo IDs, leave as-is)
mellea/backends/model_options.py	1
mellea/backends/kv_block_helpers.py	2 (line 22 is a user-visible error string)
mellea/formatters/granite/base/util.py	6
mellea/stdlib/session.py	1
mellea/core/base.py	1

Out of scope (Phase 1 / Phase 4)

Docstrings that describe _generate_from_intrinsic() by name (openai.py:541,544, huggingface.py:508,511) travel with the symbol rename in Phase 1 (#1136) — do not sweep here.