AGENTS.md: mention Freedium mirror in the overview and capture flow,
add vendor/readability/ to Key Directories, drop the NEXT.md pointer.
ARCHIVR-MENTAL-MODEL.md: fix stale references to legacy static/ paths
in Where To Edit (frontend now lives in frontend/src/); add capture.rs
and auth.rs rows; replace the outdated 'Current Limitations' section
(which claimed no capture and no auth) with a Server Capabilities
section reflecting async capture jobs, the auth model, search, and
admin scope; add a Web Capture Pipeline section covering the Freedium
mirror, SingleFile+Chromium, vendored Readability, cleanup, and Rust
post-processing.
NEXT.md: remove; the roadmap tracking is stale and unused.