v0.3.5

Added

• retention: a shared collection policy file
  ($XDG_CONFIG_HOME/adlio-collection/policy.json) re-read at every write.
  A valid file caps diff retention (none, transient, retain); an
  invalid file stores no new diff text; no file keeps the old behaviour.
  While a file exists, every sync path preserves stored payloads: an empty
  provider value never replaces a stored title, body, comment or patch, and
  no stored row is deleted.
• collection: counts-first collection by warehouse day (collect_day)
  with per-day coverage, a review frontier for reviews on pull requests
  updated later, day_counts that returns None for days not collected,
  on-demand detail (fetch_pull_request_detail), in-memory diffs
  (fetch_pull_request_diff_live) and revision fingerprints.
• GhClient cancellation (set_cancellation) and deferred rate-limit
  waits (set_defer_waits_over), reported as Error::Cancelled and
  Error::RateLimited.

Compatibility

• The three new tables are created with CREATE TABLE IF NOT EXISTS on
  open, not by a numbered migration. user_version stays 8, so a 0.3.4
  binary still opens a warehouse 0.3.5 has used.