test: add a local Docker test environment for all features

testenv/ starts two real NetBox 4.7 instances (v2 and v1 token), SSH
targets on public, mgmt, and prod networks, a jump host, an IPv6-only
host, a static host, and a client with ssh, sftp, scp, tmux, zellij,
bash, zsh, and fish. A seed script fills NetBox through the REST API.

141 end-to-end checks cover cache and refresh filters, connecting,
all resolver strategies, multiple instances, shortcuts and rewrites,
SSH options and rules, static hosts, sftp/scp incl. IPv6 and jump
hosts, tunnels, local notes and NetBox comments, completion and shell
hooks, the TUI (driven through tmux), the configurator, and uninstall.

Local only: testenv/up.sh, test.sh, shell.sh, down.sh. Not part of
CI/CD.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## Unreleased
+
+- Fix the `interface_name` resolver strategy: it sent filter names that NetBox ignores and therefore returned the host's first IP address instead of the named interface's. It now uses NetBox's `interface` and `vminterface` filters; a missing interface falls through to the next strategy.
+- Fix `netssh sftp` and `netssh scp` with instance-qualified hosts (`prod/web01:/path`), which were taken for local paths.
+- Fix shell aliases of instance-qualified hosts ignoring anchored rewrite rules (`fsn_fsn1-pve1` instead of `fsn_fsnpve1`).
+- Add `testenv/`, a local Docker environment with two NetBox instances, SSH targets, a jump host, tmux, zellij, and bash/zsh/fish, and 141 end-to-end checks of all features (`testenv/up.sh`, `testenv/test.sh`). Not part of CI/CD.
+
 ## v0.0.23
 
 - `netssh configure` now covers every setting: after the instances, a menu opens with SSH defaults, SSH options (jump host, host key checking, connection target, address family, extra arguments, `-o` options), SSH rules (add, edit, remove by tag, instance, kind, name pattern), resolver & cache (including the cache file), shortcuts & command alias, and completion (`max_results`). SSH options can also be set per NetBox instance from the instance list.