refactor(supermemory): session-level ingest + kebab aliases (salvaged from #32487) (#38756)

* refactor(supermemory): session-level conversation ingest + kebab tool aliases

Salvaged from #32487 (by @MaheshtheDev), rebased onto current main.

- sync_turn now buffers cleaned turns; the full session is ingested once
  at session end / switch / shutdown via the conversations endpoint
- ingest_conversation() accepts and forwards functional document metadata
  (type, session_id, message_count, partial)
- register kebab-case tool aliases (supermemory-save/search/forget/profile)
  alongside the snake_case names
- README + docs (EN/zh-Hans) updated for the simplified session model

Source/vendor-attribution removed per project policy (no telemetry):
dropped x-sm-source header, sm_source metadata, and sm_capture_mode tags.
Preserved the post-branch atomic_json_write(mode=0o600) hardening that the
PR's stale base had reverted. Updated provider tests for the new behavior
and added maheshthedev@gmail.com to release.py AUTHOR_MAP.

Co-authored-by: alt-glitch <balyan.sid@gmail.com>

* feat(supermemory): restore x-sm-source for Spaces routing

Reinstates x-sm-source: hermes (SDK default_headers + conversations POST)
and sm_source: hermes document metadata. Per @Dhravya (Supermemory), this
is a functional routing key, not telemetry: it groups Hermes writes into a
dedicated "Hermes" Space in the Supermemory app so users can filter and
bulk-manage memories per source agent.

sm_capture_mode remains dropped (appears analytics-only; Spaces are routed
by sm_source) pending confirmation. Adds README note + a unit test covering
_merge_metadata sm_source stamping and legacy source->type migration.

---------

Co-authored-by: Mahesh Sanikommu <maheshthedev@gmail.com>

scripts/release.py

@@ -70,6 +70,7 @@ AUTHOR_MAP = {
     "524706+Twanislas@users.noreply.github.com": "Twanislas",
     "9592417+adam91holt@users.noreply.github.com": "adam91holt",
     "kchuang1015@users.noreply.github.com": "kchuang1015",
+    "maheshthedev@gmail.com": "MaheshtheDev",
     "kyssta-exe@users.noreply.github.com": "kyssta-exe",
     "45688690+fujinice@users.noreply.github.com": "fujinice",
     "276689385+carltonawong@users.noreply.github.com": "carltonawong",