* upstream/main: (430 commits)
  fix(yuanbao): bound ws.close() so an idle server can't stall shutdown ~5s (NousResearch#40607)
  docs: add Urdu translation of README (NousResearch#40578)
  fix(hindsight): send only new-turn delta on append retains instead of whole session (NousResearch#40605)
  feat(gateway): render terminal tool calls as native bash code blocks on markdown platforms (NousResearch#41215)
  feat(desktop): stop the chat viewport from following streaming output (NousResearch#41414)
  chore(release): map AlchemistChaos co-author email for NousResearch#40135 salvage
  fix(desktop): recover chat after sleep/wake by revalidating a stale remote backend
  fix(web): make _has_env config-aware so SEARXNG_URL auto-detect honors Hermes config
  fix(web): honor Hermes config-aware SEARXNG_URL lookup
  install.sh: hint at root-owned npm cache when desktop npm install fails (NousResearch#39688)
  fix(tools): percent-encode non-ascii URL components
  fix(skills): browse shows full catalog, not first 5000 (NousResearch#41413)
  feat(desktop+gateway): remote media relay — attach images/PDFs and display gateway images over the network
  feat(desktop): full tool-backend config (pickers + per-backend settings) in Settings (NousResearch#41232)
  hardening(api-server): scan cron prompts on REST create/update for parity with the agent tool
  fix: skip MCP preflight content-type probe on reconnect when already ready (NousResearch#40604)
  fix(kanban): sweep deferred scratch parent on non-scratch child completion + tests
  fix: defer scratch workspace cleanup when task has active children (NousResearch#33774)
  feat(onboarding): opt-in structured profile-build path on first contact (NousResearch#41114)
  feat(compression): temporal anchoring in compaction summaries (NousResearch#41102)
  test(discord): align clarify/model-picker tests with fail-closed component auth (NousResearch#41338)
  chore(release): map Dusk1e and LaPhilosophie for approval fail-closed salvage (NousResearch#33844, NousResearch#33866, NousResearch#30964)
  fix(discord): fail closed for component button auth when no allowlist set
  fix(feishu): fail closed for update prompt card actions
  fix(slack): re-check gateway auth on approval and slash-confirm buttons
  fix: guard int(os.getenv()) casts against malformed env vars (NousResearch#40598)
  fix: respect Honcho env var fallback in doctor and honcho status
  chore(release): add synapsesx to AUTHOR_MAP for NousResearch#40495 salvage
  fix(research): keep tool_call/tool_response pairs intact when compressing trajectories
  fix(simplex): accept display name in SIMPLEX_ALLOWED_USERS
  fix(desktop): make the running-turn timer per-session (NousResearch#41182)
  test(approval): regression for shell-escape denylist bypass (NousResearch#36846, NousResearch#36847)
  fix(security): strip shell escapes in denylist normalizer; fail-closed on missing approval module
  fix(stream+output-cap): guard empty streams and parse OpenRouter output-cap errors (NousResearch#40589)
  fix(desktop): bootstrap falls back to installed agent install.sh on GitHub 404
  feat(dashboard): change UI font from the theme picker, independent of theme (NousResearch#41145)
  fix(cli): return bool (not None) when a destructive-slash confirmation is cancelled (NousResearch#40583)
  fix(desktop): preserve configured base_url on same-provider model switch (NousResearch#41121)
  fix(desktop): stop bare-URL autolinker swallowing trailing emphasis asterisks (NousResearch#41093)
  fix(cron): bound the desktop run-history query to one job (NousResearch#41088)
  fix(desktop): scope in-session /model switch per-session, stop process-env leak (NousResearch#41120)
  chore: map bmoore210 author email for PR NousResearch#40550 salvage
  fix(desktop): scope session list to active profile + longer timeout
  fix: harden gateway startup and turn persistence
  fix(computer_use): honor custom vision routing
  fix(aux): honor model.default_headers on auxiliary client too (NousResearch#40033)
  fix(agent): honor model.default_headers for custom OpenAI-compatible providers (NousResearch#40033)
  docs(i18n): port deep-audit corrections to zh-Hans mirror (NousResearch#41104)
  fix(compression): don't overwrite the -1 post-compression sentinel in preflight seed (NousResearch#36718)
  chore(release): map singhsanidhya741@gmail.com to sanidhyasin (NousResearch#41094)
  ...

…tch (NousResearch#41121)

The desktop model picker calls POST /api/model/set with provider+model only
(no base_url). _apply_main_model_assignment cleared model.base_url for every
non-custom provider, so re-picking a Xiaomi MiMo model wiped a Token Plan
endpoint (https://token-plan-*.xiaomimimo.com/v1) back to the registry default
api.xiaomimimo.com — breaking valid tp- keys with 401s.

Now base_url is cleared only when switching to a different provider (the stale
URL belonged to the old one); same-provider re-assignment preserves it, and an
explicitly supplied base_url is honored for any provider.