hermes-agent

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teknium1 2658494e81 fix(kanban): add per-path env overrides + dispatcher env injection

Layers defense-in-depth on top of the shared-root anchoring (base commit).

Changes in hermes_cli/kanban_db.py:
- kanban_db_path() now honours HERMES_KANBAN_DB first, then falls through
  to kanban_home()/kanban.db.
- workspaces_root() now honours HERMES_KANBAN_WORKSPACES_ROOT first, then
  falls through to kanban_home()/kanban/workspaces.
- All three overrides (HERMES_KANBAN_HOME, HERMES_KANBAN_DB,
  HERMES_KANBAN_WORKSPACES_ROOT) now call .expanduser() for consistency.
- _default_spawn() injects HERMES_KANBAN_DB and
  HERMES_KANBAN_WORKSPACES_ROOT into the worker subprocess env. Even
  when the worker's get_default_hermes_root() resolution somehow
  disagrees with the dispatcher's (symlinks, unusual Docker layouts),
  the two processes still open the same SQLite file.

Module docstring updated to describe all three overrides and the
dispatcher env-injection contract.

Tests (tests/hermes_cli/test_kanban_db.py, TestSharedBoardPaths):
- test_hermes_kanban_db_pin_beats_kanban_home
- test_hermes_kanban_workspaces_root_pin_beats_kanban_home
- test_empty_per_path_overrides_fall_through
- test_dispatcher_spawn_injects_kanban_db_and_workspaces_root
  (monkeypatches subprocess.Popen, asserts both env vars reach the
  child even after HERMES_HOME is rewritten by `hermes -p <profile>`.)

Docs: website/docs/reference/environment-variables.md gets entries
for the three kanban env vars.

This fusion is built on the cleanest of the seven competing PRs that
targeted issue #18442:

* Base commit (from PR #19350 by @GodsBoy): add `kanban_home()` helper
  anchored at `get_default_hermes_root()`, reroute all 5 kanban path
  sites through it (including the 3 sibling log-dir sites that the
  other six PRs missed), 8-test regression class.
* Dispatcher env-var injection approach drawn from PRs #18300
  (@quocanh261997) and #19100 (@cg2aigc).
* Per-path env overrides drawn from PR #19100 (@cg2aigc).
* get_default_hermes_root() resolution direction first proposed in
  PR #18503 (@beibi9966) and PR #18985 (@Gosuj).

Closes the duplicate/competing PRs: #18300, #18503, #18670, #18985,
#19037, #19056, #19100. Fixes #18442 and #19348.

Co-authored-by: quocanh261997 <17986614+quocanh261997@users.noreply.github.com>
Co-authored-by: cg2aigc <232694053+cg2aigc@users.noreply.github.com>
Co-authored-by: beibi9966 <beibei1988@proton.me>
Co-authored-by: Gosuj <123411271+Gosuj@users.noreply.github.com>
Co-authored-by: LeonSGP43 <154585401+LeonSGP43@users.noreply.github.com>