phase: 95_read_truncation_cap

All gates are green. Final verification is complete — no fixes were needed; the phase is fully implemented and passing.

**Phase 95 final verification report**

- Verified all 3 tasks already implemented (task files in `complete/`): read cap + notice + `ToolResultPiece` (task 01), `tool_result` SSE + live/saved/shared marker (task 02), E2E suite (task 03).
- Code checks passed: `BOR_READ_MAX_CHARS` (default 128 000, validator), pinned `READ_TRUNCATION_NOTICE` + `TRUNCATION_MARKER`, byte-identical at/under-cap read, holder `read_truncations` (no `tool_calls` impact), piece order (after `tool`, before next round), `ChatToolResultEvent`, `ToolCall` back-compat fields, `app.js` live/restore handlers, `shared.js`, `.truncated-note` CSS, `.env.example` entry, mock-LLM echo script.
- **Tests:** `uv run pytest` → 1966 passed; `uv run pytest --cov=app --cov-report=term-missing` → all green, TOTAL **99%** (>90% gate).
- **E2E:** `uv run pytest tests/e2e/test_read_truncation_cap.py -v --no-cov` → **3 passed** (frame order + live marker + LLM notice via echo; save→shared fidelity; short-read control).
- **Regression (isolated):** `test_agent_document_tools` 4 ✓, `test_chat_history` 5 ✓, `test_share_chat` 4 ✓, `test_big_read_progress` 4 ✓, `test_stop_generation` 3 ✓.
- **Lint/types:** `uv run ruff check .` → All checks passed; `uv run pyright` → 0 errors, 0 warnings.

**Completion criteria:** ① over-cap read → first-cap-chars + marker + pinned notice — ✓ (unit-pinned: at-cap/cap+1/notice tests); ② user marker live/saved/shared — ✓ (E2E + frontend tests); ③ at/under cap byte-identical, no frame — ✓ (unit + control E2E); ④ top-2 `<documents>` retrieval untouched — ✓ (`app/rag/retriever.py` unmodified vs HEAD); ⑤ suite green, >90% coverage, ruff+pyright clean — ✓; ⑥ no completed-phase behavior change — ✓ (all gates green; commit left to harness per pass rules).

- No defects found; no changes made this pass. Next pending phase: none in `todo/` (96 is the next free number).

tests/integration/test_agent_tools.py

@@ -42,7 +42,13 @@ from app.config import Settings
 from app.models import Document, FolderSummary, GitSource
 from app.rag import agent
 from app.rag.agent import AGENT_TOOLS, AgentHolder, run_agent
-from app.rag.llm import LLMClient, RetryPiece, StreamPiece, ToolCallPiece
+from app.rag.llm import (
+    LLMClient,
+    RetryPiece,
+    StreamPiece,
+    ToolCallPiece,
+    ToolResultPiece,
+)
 
 if TYPE_CHECKING:
     from app.rag.scaffolding import ScaffoldingFilter
@@ -254,8 +260,8 @@ def _run_call(
 
 async def _consume(
     llm: LLMClient, db: Session, holder: AgentHolder
-) -> list[StreamPiece | ToolCallPiece | RetryPiece]:
-    out: list[StreamPiece | ToolCallPiece | RetryPiece] = []
+) -> list[StreamPiece | ToolCallPiece | RetryPiece | ToolResultPiece]:
+    out: list[StreamPiece | ToolCallPiece | RetryPiece | ToolResultPiece] = []
     async for piece in run_agent(
         llm,
         db,