jhheider / wayfinder / 29074135617

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Exponential backoff retries + raise test coverage 51% -> 67%

- search_raw now retries 429/503 with exponential backoff (500ms base,
  doubling, honoring Retry-After, capped 30s), up to 3 attempts, replacing
  the single retry. backoff_delay is a pure, unit-tested helper.
- Add AonClient::with_endpoint so the client can point at a mirror/proxy or a
  test server (new() delegates to it).
- Tests: cover the previously-untested logic --
  * client.rs retry loop / status handling via an in-process HTTP mock
    (no new deps; Retry-After: 0 keeps it instant). client.rs 30% -> 94%.
  * MCP format.rs (0% -> 99%) and core render/colored.rs (0% -> 99%).
  * parse_documents / parse_total / GameSystem accessors; MCP
    parse_category_buckets; CLI parse_filter / is_known_category.
  Workspace line coverage 51% -> 67%, function coverage -> 81%, 138 tests.

Remaining uncovered is mostly async command/tool dispatch and the binary
entry points (integration surface), not core logic.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N1GoLDpLwNhWLJ98YzZqGW

132 of 134 new or added lines in 4 files covered. (98.51%)

1573 of 2178 relevant lines covered (72.22%)

104.38 hits per line