feat: Slice 1 polish - MiMo V2.5 model, visible reasoning, image attachments, mobile keyboard fix

- Switch conversation agent to xiaomi/mimo-v2.5 (multimodal: text + image)
- Render native reasoning parts as live 'Thinking trace' (streaming open,
  collapsed after completion); inline <think> extraction for streaming models
- Image attachments: picker (up to 4, 10MB each), base64 to Flue
  AgentPromptImage, authenticated blob-URL replay for historical images
- Mobile keyboard viewport fix: visual-viewport hook, fixed shell,
  interactive-widget=resizes-content, header pinned, composer follows keyboard
- Conversation to Signal to proposed Work: Convex persistence, Effect
  validation in @code/work-os, Work cards with exact source provenance
- Streamdown markdown + Mermaid chart rendering in chat messages
- Flue tool turns hidden, reasoning-containing turns remain visible
- Frontend regression tests: keyboard viewport, responsive shell,
  attachment overflow, authenticated images, reasoning traces, transforms
- .env.example updated to xiaomi/mimo-v2.5 config

docs/glossary.md

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+# Zopu Work OS — Canonical Glossary
+
+> **Purpose:** prevent agents and humans from using overlapping terms inconsistently.
+
+| Term | Definition | Not the same as |
+|---|---|---|
+| Project | Durable product/repository/context boundary. | Work or chat thread |
+| Message | Exact conversational input/output. | Signal |
+| Signal | Provenanced evidence that may require attention. | Work |
+| Work | Durable desired outcome linking all evidence and lifecycle. | Issue, task, session, PR |
+| Work Definition | Versioned product-level contract: problem, outcome, criteria, scope, risk. | Implementation plan |
+| Impact Map | Systems/contracts/data/operations potentially affected. | File list only |
+| Architecture | Component interaction, ownership, contracts, trust/data flow. | Program design |
+| Design Packet | Versioned implementation intent: file/call-flow deltas, types, invariants, slices. | Generated code |
+| Vertical Slice | Bounded increment exposing observable behavior across necessary layers. | Horizontal backend/frontend phase |
+| Step | Executable graph node; a slice may contain implementation/verify/publish steps. | Work |
+| Kit | Versioned executable policy/configuration for resolving Work. | Agent or runtime |
+| Kit Builder | Compiler selecting/composing a Kit from approved intent and policy. | Unbounded prompt generator |
+| Resolver | Durable engine deciding what must happen next until terminal outcome. | Coding harness |
+| Run | Coordination record for resolving a Work/step using one Kit version. | Attempt |
+| Attempt | One bounded execution in one runtime/harness context. | Whole Work |
+| Actor | Rivet durable identity owning serialized state/lifecycle. | Agent/model |
+| Agent | Program/model-directed reasoning role producing proposals or actions. | Actor |
+| Harness | Coding/tool-loop implementation such as OMP/OpenCode/Codex/Pi. | Sandbox |
+| Runtime | Capability provider executing processes/files/network. | Harness |
+| Sandbox | Isolated runtime instance for untrusted/project execution. | Worktree |
+| Orb | Product-level execution envelope: runtime, workspace, harness, context, credentials, artifacts. | Agent |
+| Worktree | Git checkout isolated for a candidate branch/Work. | Sandbox |
+| Candidate | Unverified implementation revision/output. | Verified result |
+| Verification Plan | Predeclared checks and evidence required for completion. | Test command only |
+| Verification Result | Evidence-bound verdict for an exact revision/environment. | Agent statement |
+| Artifact | Durable output/reference: diff, report, screenshot, commit, PR, preview. | Evidence automatically |
+| Evidence | Artifact/data supporting a specific claim/check. | Summary prose |
+| Question | Structured human input request blocking or affecting Work. | Chat thread |
+| Decision | Durable answer/approval bound to exact Work/design/version. | Informal message |
+| Review Package | Human-oriented narrative of intent, design, changes, evidence, risks. | Raw Git diff |
+| Integration | Composition and verification of multiple slice/candidate changes. | Merge without checks |
+| Delivery | Publication/release artifacts and transitions. | Outcome |
+| Result | Actual effect compared with desired outcome. | PR merged |
+| Learning | Post-work observation proposing future knowledge/process improvement. | Automatic memory mutation |
+| Knowledge | Reviewed durable project/product facts, decisions, and conventions. | Harness session memory |
+| Policy | Deterministic constraints for risk, tools, permissions, gates, budgets. | Model preference |
+| Provenance | Exact origin and chain linking Signal, decision, code, evidence, result. | Generated summary |
+| Terminal state | Explicit successful/failed/blocked/cancelled outcome requiring no hidden work. | “Agent stopped” |