Two changes:
1) Rename the client-local head-bookkeeping file .sync_manifest -> .sync_state
(read_sync_state/write_sync_state) to remove the name collision with the
§2.8 plane 'sync-manifest' OBJECT. read_sync_state migrates an existing
.sync_manifest on first read so no device loses its head record.
2) Make the knobs a Hermes Cloud instance needs env-configurable, so an
instance can be set up to use sync BY DEFAULT with no config.yaml edit or
per-skill CLI call. Precedence: HERMES_SYNC_* env -> config.yaml sync.* ->
built-in default (mirrors the existing HERMES_SYNC_BASE_URL bridge).
- HERMES_SYNC_ENABLED -> sync.enabled (master on/off; def off)
gated in maybe_push/maybe_pull alongside the dev-gate + base_url.
- HERMES_SYNC_DEFAULT_OPT_IN -> sync.default_opt_in (M1-D policy; def off)
opt-out mode: every eligible skill syncs unless usage rec says sync:false;
'your skills follow you with no setup' — the Cloud default. opt-in mode
(default) unchanged: only sync:true skills sync.
sync_status() + 'hermes sync status' surface feature_enabled/default_opt_in.
Cross-repo byte-compat re-verified: client manifest bytes still parse cleanly
through gateway-gateway parseSyncManifest.
Tests: 41 pass (+7: env precedence, opt-out/opt-in policy, rename migration).
Ben Barclay
1f33fb2d00