Add v0.7.0 release notes

Author: itsdodobitch

RELEASE-v0.7.0.md

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+# Hermes Desktop v0.7.0
+
+`v0.7.0` is a release about staying close to upstream Hermes while making the
+desktop workspace feel more deliberate.
+
+Since `v0.6.1`, the biggest change is the Kanban upgrade: Hermes Desktop now
+understands the newer upstream board model, while keeping the same host-first
+SSH design. The default board still lives at `~/.hermes/kanban.db`, and newer
+Hermes Agent builds can expose additional boards under the host-wide Kanban
+home.
+
+This release also adds a small but useful app update check, refreshes the
+README preview gallery, and gives the embedded terminal a more polished set of
+appearance controls.
+
+## Highlights
+
+- upstream Kanban board management, including board selection, board creation,
+  board archive, and fallback behavior for hosts that only expose the default
+  `~/.hermes/kanban.db` board
+- richer Kanban task operations over SSH: task creation, search, filters,
+  assignment, comments, block, unblock, complete, archive, delete, run history,
+  event history, worker log tailing, and dispatcher nudging when the host
+  supports it
+- Kanban compatibility checks that clearly tell users when a newer Hermes Agent
+  build is needed for multiple boards or home-channel subscriptions
+- terminal appearance polish with six stable presets, custom background and
+  text color tuning, and anchored ANSI palettes so prompts, git output, and
+  command-line tools stay readable
+- built-in Hermes Desktop update checks against GitHub Releases, with automatic
+  checks limited to the app itself and manual checks available from the Hermes
+  menu
+- refreshed README preview gallery with six current screenshots: Sessions,
+  Kanban, Files, Usage, Skills, and Terminal
+- documentation updates that describe the host-wide Kanban home, app-only update
+  checks, and the `0.7.0` release packaging path
+- continued localization coverage for English, Simplified Chinese, and Russian
+  strings touched by this release
+
+## Compatibility
+
+- Multiple Kanban boards require a Hermes Agent build with the newer upstream
+  board APIs.
+- Hosts with only the default upstream Kanban database still use
+  `~/.hermes/kanban.db`.
+- The update checker checks Hermes Desktop releases only. It does not update
+  Hermes Agent on the host and does not send host, profile, file, session, or
+  Kanban content to GitHub.
+
+## Still True
+
+- Hermes Desktop still connects directly over SSH.
+- The Hermes host remains the source of truth.
+- There is no desktop gateway API, remote helper daemon, local mirror, or shadow
+  sync layer.
+- Kanban, sessions, cron jobs, files, skills, usage, and terminal work stay
+  anchored to the selected host.
+- The app continues to favor a native Mac surface for the real Hermes workflow
+  over a second transport model.
+
+## Notes
+
+- universal macOS build for Apple Silicon and Intel
+- open source
+- ad-hoc signed and not notarized yet, so first launch may still require
+  right-click -> Open / Open Anyway
+- release archive: `HermesDesktop.app.zip`
+- checksum: `HermesDesktop.app.zip.sha256`