Fix 13 wrong REE/INDIUM CHEBI enum groundings

[realmarcin]

Problem

Follow-up to #206 (PALLADIUM). Auditing the full MetalElementEnum +
RareEarthElementEnum (each meaning: id vs its current ChEBI label) found the
palladium bug was not isolated — 13 more wrong groundings, almost all in
the rare-earth block. The ids had drifted off-by-one within the CHEBI:333xx
lanthanide range, plus a couple of digit transpositions:

enum	was	resolved to	now
INDIUM	CHEBI:49464	aluminium trifluoride	CHEBI:49664 indium(3+)
LANTHANUM	CHEBI:32359	dodecanoyl group	CHEBI:49701 lanthanum(3+)
CERIUM	CHEBI:32998	(not in build)	CHEBI:48782 cerium(3+)
PRASEODYMIUM	CHEBI:49648	holmium atom	CHEBI:229784 praseodymium(3+)
SAMARIUM	CHEBI:33376	terbium atom	CHEBI:49890 samarium(3+)
EUROPIUM	CHEBI:30688	(not in build)	CHEBI:49591 europium(3+)
TERBIUM	CHEBI:33374	samarium atom	CHEBI:49902 terbium(3+)
DYSPROSIUM	CHEBI:49782	(not in build)	CHEBI:33377 dysprosium atom¹
HOLMIUM	CHEBI:49649	(not in build)	CHEBI:49650 holmium(3+)
ERBIUM	CHEBI:49650	holmium(3+)	CHEBI:33379 erbium¹
THULIUM	CHEBI:33377	dysprosium atom	CHEBI:33380 thulium atom¹
YTTERBIUM	CHEBI:33378	(not in build)	CHEBI:49980 ytterbium(3+)
YTTRIUM	CHEBI:49976	zinc dichloride	CHEBI:49962 yttrium(3+)

¹ ChEBI has no (3+) cation term for Dy/Er/Tm — grounded to the atom, description annotated.

Decision

Ground REEs as the (3+) cation to match every enum description: "X(3+)
cation". This also normalises the four entries that happened to already resolve
(Nd/Gd/Lu/Sc) from the atom form to their cation ids, making the enum internally
consistent.

Why it drifted undetected

Enum meaning: groundings are not covered by validate-products, which only
checks record-level term.{id,label} pairs. The shipped REE records ground via
their own (correct) term pairs — e.g. Ion_Adsorption_REE_Indigenous_Community.yaml
uses CHEBI:33377/CHEBI:49962 — so the KGX export was unaffected; the bug
lived purely in the schema enum + the metal_extraction.py mirror map. Closing
that gate gap (a test validating enum meanings against canonical labels) is logged
as a deferred follow-up in NEXT_TASKS.md §0 item 2.

Changes

• schema/communitymech.yaml — 13 REE + INDIUM meaning: ids repointed
• datamodel/communitymech.py — regenerated (just gen-python)
• metal_extraction.py — REE_CHEBI_MAP + METAL_CHEBI_MAP (INDIUM) mirror
• NEXT_TASKS.md — finding logged; this fix marked done, guard-test follow-up deferred

Verification

• Re-audit of both enums vs ChEBI: 0 mismatches
• linkml-validate on all REE-using records: clean
• just test — 197 passed

🤖 Generated with Claude Code

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