v0.4.5 — search-method rename + docs restructure

Coordinates with outrider v1.7.7's pin-method → search-method input rename.

CLI changes

• Hard rename --pin-method → --search-method. No deprecation shim (early adoption).
• Three-tier framing in outrider trigger docstring: default (ranked pool) → --search-method (query override) → --pin-arxiv (exact).
• Workflow template (outrider_local.py) emits search-method: as the workflow_dispatch input.

Docs restructure

• README trimmed from 183 → 57 lines. Grep-friendly at the top level.
• Content pushed to docs/: pipeline explanation (new), research-interests flavors (new), method-targeted runs (extended with team-scale patterns), full command reference (new).

Breaking change

--pin-method is removed. Update dispatch scripts to use --search-method (for free-text queries) or --pin-arxiv (for exact arxiv ids).