docs: add research citations, update roadmap with shipped features

- Add Monce et al. (2025) and MINES (2025) citations to the
  'What etch is' section, establishing academic backing for the
  snapshot and noise detection approaches.

- Move approve --pattern and array reordering to shipped list.

- Add etch verify (metamorphic relations) and HTML diff reports
  to the planned roadmap as the next high-value features.

Author: ojuschugh1

README.md

@@ -113,6 +113,8 @@ Keploy records API calls and database queries using eBPF kernel hooks or languag
 
 Etch catches regression — unintended changes in API responses. It's not a correctness testing tool. For verifying business logic, combine etch with your existing unit tests. They're complementary, not competing.
 
+Etch's approach is backed by recent research: Monce et al. (2025) proposed API Interaction Snapshots for detecting behavioral breaking changes that only surface at runtime — essentially the same problem etch solves for HTTP APIs. The noise detection and normalization system aligns with work on API invariant mining (MINES, 2025), which separates signal from noise in runtime API behavior.
+
 ## How it works
 
 ```
@@ -367,16 +369,18 @@ go test -race ./...      # race detector
 - [x] CI/CD templates (GitHub Actions + GitLab CI)
 - [x] Cross-platform builds (Linux, macOS, Windows)
 - [x] OpenAPI 3.0 spec generation from traffic
+- [x] Array reordering treated as non-breaking (order-insensitive comparison)
+- [x] Pattern-based bulk approvals (`etch approve --pattern <field>`)
 
 ### Planned
 
-- [ ] `etch approve --pattern` — bulk approve changes matching a field name
+- [ ] `etch verify` — metamorphic relation checks (e.g. "pagination total matches count endpoint")
+- [ ] HTML diff reports — shareable before/after view without the CLI
 - [ ] Noise presets (`etch noise --preset stripe|github|aws`)
 - [ ] Environment variable support in snapshots (`{{BASE_URL}}`)
 - [ ] GitHub PR comments with diff summaries
 - [ ] Watch mode (continuous recording)
 - [ ] gRPC / GraphQL support
-- [ ] Metamorphic testing for relationship checks between endpoints
 
 ## Contributing