Task: Nest Conversations under the selected Agent

Identity

Change the Makelore Code sidebar so the selected Agent is the visible parent of its Conversations instead of rendering separate sibling 伙伴 and 对话 sections.
Preserve the existing agentId ownership/filtering, Conversation selection, lazy first-Conversation creation, unread/running indicators, and new-Conversation action.
Add focused Renderer coverage and an Electron E2E assertion for the hierarchy; do not change project metadata, Host APIs, Pi runtime, or user data.

Render each Agent as a collapsible parent row. Only the selected Agent expands, and its Conversation list is placed immediately beneath it with a clear ${agent.name} 的对话 label.
Keep all existing interactive hit areas at least 40px and retain the product's single light visual system, exact-property press transitions, and current button semantics.
Do not add a compatibility layer, new state model, animation dependency, or Agent/Conversation migration. The persisted relationship is already correct.
The user requested direct implementation without subagents.

Task context:

Task ID: 20260825-agent-conversation-tree-4d8a2c71
Mode: feature
Branch: codex/20260825-agent-conversation-tree-4d8a2c71-agent-conversation-tree
Worktree: D:\Datas\OthersProjects\makelore-agent-conversation-tree-4d8a2c71
Base commit: c4ca16fa198a1e5a90bd1b72bf0cee22f6ee1baa
Other active local tasks: eleven non-ready owners were inspected through their task records.
Overlap or semantic-conflict assessment: the only adjacent task is the older undefined partner-create-model-parity diagnosis. This task does not change partner/model semantics or its files; the old Main OpenCode integration and all Canvas/Robot/Learning tasks are unrelated. No semantic conflict blocks this UI-only change.

Read:

.project-docs/05-agent-entry/memory-index.md
.project-docs/05-agent-entry/read-before-planning.md
.project-docs/05-agent-entry/planning-gate.md
.project-docs/00-brief/project-positioning.md
.project-docs/00-brief/success-criteria.md
.project-docs/30-worklog/current-state.md
.project-docs/10-decisions/decision-index.md
.project-docs/20-architecture/system-overview.md
.project-docs/20-architecture/module-map.md
.project-docs/20-architecture/data-flow.md
.project-docs/40-domain/business-rules.md
.project-docs/40-domain/glossary.md
.project-docs/50-evidence/evidence-index.md
.project-docs/60-reflection/reflection-index.md
.project-docs/80-commitments/commitments.md
.project-docs/90-maintenance/stale-items.md
Diagnosis record 20260825-conversation-agent-binding-8a4c2e71 and PI-120/PI-130 implementation records.

Relevant understanding:

Project goal: keep Makelore Code local and project-scoped, with Renderer access through typed facades and Main ownership of runtime and secrets.
Current integrated focus: the live cumulative source is the Pi hard-cut product; shared canonical memory still contains stale OpenCode-era module descriptions.
Active task scope: improve only the Agent → Conversation visual hierarchy in CodingChatPanel.
Active constraints: no runtime/API/storage changes; preserve all target isolation and selection behavior.
Decisions affecting this task: Conversation metadata is Agent-owned through mandatory agentId; only the selected Agent's unarchived Conversations are rendered.
Evidence, reflections, or commitments affecting this task: installed testgame has two Conversations both uniquely owned by ccc; no orphaned metadata exists. No shared commitment changes this UI work.
Files or modules likely involved: src/pages/Chat/CodingChatPanel.tsx, tests/unit/coding-chat-panel.test.tsx, and tests/e2e/pi-coding-first-chat.spec.ts.
Unknowns, stale docs, or conflicts: canonical project positioning is a placeholder and module map is OpenCode-stale; current source plus Pi task records are authoritative. No unresolved behavior conflict remains.

Gate result:

Add a focused failing Renderer test that requires the selected Agent to expose an expanded child Conversation group and hides another Agent's Conversations.
Move the existing Conversation header/list/create/loading block inside the selected Agent's rendered group, using a parent surface plus an indented child rail without changing selection or creation logic.
Add a small production-seam E2E assertion for the visible Agent-owned group, then run focused tests, typecheck, lint, build:vite, and the applicable Electron E2E.
Update this task record with actual outcome and verification, run the documentation gate, and commit only task-owned changes.

Replaced the sibling 伙伴 / 对话 sidebar sections with one 伙伴与对话 hierarchy.
Each Agent is now an accessible expandable parent row. The selected Agent uses a concentric selected surface, expanded chevron, aria-expanded, and an immediately nested child group labelled ${agent.name} 的对话.
Moved the existing Conversation rows, create action, first-Conversation loading indicator, unread marker, and run spinner into the selected Agent's child group without changing any state, API, storage, or runtime behavior.
Kept unselected Agents collapsed, so a Conversation cannot visually appear at project level or under another Agent.
Updated README.md to describe the nested Agent-owned Conversation list.

Red phase: the new hierarchy regression failed against the prior sibling layout while the other 15 coding-chat-panel tests passed.
corepack pnpm exec vitest run tests/unit/coding-chat-panel.test.tsx --maxWorkers=1: passed, 1 file / 16 tests.
corepack pnpm run typecheck: passed.
corepack pnpm run lint:check: passed with 0 errors and 5 pre-existing warnings outside the changed files.
corepack pnpm run build:vite: passed; existing dynamic-import and chunk-size warnings remain.
corepack pnpm test: passed; functional stage 179 files / 1523 passed / 2 skipped, isolated pressure stage 1 file / 1 passed.
corepack pnpm exec playwright test tests/e2e/pi-coding-first-chat.spec.ts: passed, 2/2. The production Renderer seam asserts the expanded Builder parent, nested Builder 的对话 group, first Conversation, and second-Conversation selection inside that group.

A rebuilt installer is not part of this UI source task; package from this commit only when the user requests a new installer.