Resolve stage: matching, version resolution, fixtures; BGG API auth

bggpipe resolve works end to end: search -> exact/fuzzy candidate
scoring -> auto/ambiguous/unmatched classification with owned-count
tie-breaks (mixed base/expansion candidates never auto-match), version
scoring from edition cues (never guessed; no cues -> version_unknown),
idempotent matches.csv appends.

Discovered mid-build: BGG now requires registered-application Bearer
tokens on the XML API (2025 policy change) and returns 401 otherwise.
Client sends Authorization from BGG_API_TOKEN and raises an actionable
BGGAuthError; CLAUDE.md and the bgg-api skill are updated to match.
Live fixture recording is blocked until registration is approved, so
tests replay hand-crafted stub fixtures via a network-refusing
transport; scripts/record_fixtures.py re-records real XML under the
same cache keys once a token exists. One live read-only smoke test is
skipped unless --run-live.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.claude/skills/bgg-api/SKILL.md

@@ -5,6 +5,19 @@ description: Reference for BoardGameGeek's XML API2 and website automation — e
 
 # BoardGameGeek API & site automation reference
 
+## Authentication (required since 2025)
+
+Every XML API request must carry `Authorization: Bearer <token>` or BGG
+returns **401 Unauthorized**. Tokens come from a registered application:
+create one at `https://boardgamegeek.com/applications` (non-commercial
+license is free; approval can take a week or more), then generate a token
+under "Tokens". `bggpipe` reads it from the `BGG_API_TOKEN` env var — never
+put it in config.toml, code, or logs. Requests must go to
+`boardgamegeek.com` **without** a leading `www` or the token is ignored.
+Exception: downloading your own collection while logged in on the website
+needs no registration — relevant to the Playwright stages, not the API
+client. Usage is monitored per-application at `/applications` → "Usage".
+
 ## Endpoints (XML API2 — the only sanctioned read API)
 
 - Search: `https://boardgamegeek.com/xmlapi2/search?query=<title>&type=boardgame,boardgameexpansion`