chore: add project profile + bootstrap glossary

Add .claude/dev-cycle-profile.yml (skills-plugin profile) with
paths.glossary pointing at the new docs/glossary.md, so the glossary
becomes standing reading for every role. The glossary pins 19 canonical
terms bootstrapped from the design spec and source doc comments;
canonical forms are English (repo-English rule), German spec-prose forms
listed under Avoid.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/glossary.md

@@ -0,0 +1,85 @@
+# Glossary
+
+Canonical nomenclature for alpha-id. This file is the source of truth for
+the project's terminology: where any other document names a concept
+differently, the canonical entry here — and its **Avoid** list — wins.
+Each block is a canonical term, an **Avoid** line of synonyms not to use,
+and a definition of at most two sentences. (Canonical terms are English,
+per the repo-English rule; the spec's German prose forms appear as
+synonyms to avoid.)
+
+### alpha-id
+**Avoid:** —
+The Rust tool and CLI binary that turns caller-extracted diagnostic phrases into a ranked list of ICD-10-GM code suggestions. Distinct from Alpha-ID, the upstream data source it consumes.
+
+### Alpha-ID
+**Avoid:** —
+The BfArM Alpha-ID dataset mapping free-text diagnosis phrases to ICD-10-GM codes; the source of the match corpus. Distinct from alpha-id, the tool that consumes it.
+
+### extracted phrase
+**Avoid:** segment, unit, Einheit, Formulierung
+One caller-extracted diagnostic phrase (one input line) — the unit that is matched and ranked. In source code this concept is carried by the identifier `segment` (e.g. `split_segments`, `source_segments`), which is retained as a code term only.
+
+### Mode C
+**Avoid:** Modus C
+The lexical-baseline retrieval mode: BM25 over the corpus plus tag filtering, with no IONOS calls. Also the degrade target for Mode A.
+
+### Mode A
+**Avoid:** Modus A, semantic mode
+The hybrid retrieval mode: lexical and semantic (IONOS embedding) pools fused via RRF, then cross-encoder reranked. Degrades to Mode C on any IONOS failure.
+
+### billable
+**Avoid:** abrechenbar, Abrechenbarkeit
+An ICD code marked `Para295 == "P"` in ClaML, i.e. valid as a standalone billing diagnosis. The `--billable-only` filter and the BillableRecall@10 metric key off this tag.
+
+### ClaML
+**Avoid:** —
+The Classification Markup Language XML distribution of ICD-10-GM, parsed for code metadata (chapter, billability, descriptions) and for modifier expansion.
+
+### modifier expansion
+**Avoid:** subclassification, Subklassifikation
+The ClaML process of generating terminal sub-digit codes (e.g. `E11.90`) by applying `<ModifierClass>` definitions, referenced via `<ModifiedBy>`, to a parent category. Produces the synthesized billable leaf codes the corpus matches against.
+
+### RRF
+**Avoid:** —
+Reciprocal Rank Fusion: the rank-based method that merges the lexical and semantic candidate lists into one fused pool in Mode A.
+
+### rerank
+**Avoid:** —
+The Mode A cross-encoder step that rescores the fused candidate pool against the query phrase, using the IONOS reranker model.
+
+### corpus
+**Avoid:** Korpus, match corpus
+The set of Alpha-ID phrase entries that retrieval matches against.
+
+### embedding store
+**Avoid:** embedding cache
+The per-phrase, content-hash-keyed persistent store of corpus embeddings under `index/`. Resumable, so an interrupted full embedding run can be continued.
+
+### vector index
+**Avoid:** ANN index
+The in-RAM matrix of corpus embeddings searched by exact cosine similarity for the semantic pool. Built only when every corpus entry has a cached embedding; otherwise Mode A degrades.
+
+### degrade
+**Avoid:** —
+Mode A falling back to Mode C when any IONOS step fails (embed, rerank, or a missing vector index); the request is still answered and `degraded` is set in diagnostics. Distinct from the 5-char-parent lookup fallback in `meta_lookup`.
+
+### tag filter
+**Avoid:** —
+The predicate that drops suggestions by their tags — `billable_only`, `valid_only`, `exclude_exotic`, and `chapters` — applied after ranking and before truncating to the top-k.
+
+### eval harness
+**Avoid:** —
+The offline evaluation that injects transcription errors into known billable phrases and measures whether the true code returns in the top-10.
+
+### exotic
+**Avoid:** —
+An ICD code tagged `Meta == "J"` in ClaML, marking a rare/exotic code; removable via `--exclude-exotic`.
+
+### chapter
+**Avoid:** —
+The ICD-10-GM chapter, stored as a zero-padded two-digit string ("01".."22") derived from the ClaML Roman-numeral chapter code. The `--chapters` filter matches against this value.
+
+### BillableRecall@10
+**Avoid:** —
+The project's lead metric: the share of billable-code eval cases whose true code appears in the top-10 suggestions.