Why: Every turn rebuilt context from UI messages with 160-char tool-result
summaries and truncated arguments (quality diagnosis root cause 1). The kernel
session transcript already persists full-fidelity messages; P2-I2 switches the
direct path to it as the authority, per the approved plan (Documents
2026-10-09 §4 P2, user ruling 2).
First run (or after structural divergence) seeds the transcript once with the
full ctxasm assembly; later runs pass only the current user message. Dynamic
context - tail notes (personal instructions, session notes, world-book
entries), env update (date, workspace files) and newly hit task-layer prompt
modules - refreshes once per non-seed run via Reminders, so the frozen seed
system prompt stays accurate. Structural divergence (excluded messages,
variant switching, regeneration) changes a fingerprint and reseeds the
transcript from the message store - the regenerate/exclude/variant mapping.
Legacy transcripts without a fingerprint are adopted, not wiped, preserving
crash-pairing repair. Near the window threshold a 9-section compaction
(aux.session-compact, extractive fallback) summarizes older turns with the
kernel's append-only compaction entry; the kernel request-side micro-clear
still bounds within-run spikes. Backend's nested agent-native pin moves to
the reasoning-capture/replay kernel head.
Evidence: SELF - new tests TestContextRevisionStableOnAppendAndChangesOnDivergence,
TestTranscriptReseedsOnVariantSwitch, TestBuildCurrentUserCarriesAttachmentsAndKnowledge;
TestDirectRunSeedsStoreHistoryOnce updated to authoritative semantics; go vet
+ go test ./... pass; live before/after on the golden task set recorded on
the phase02 task card per the policy clause.
Impact: Direct conversations with a workspace sandbox now carry full tool
results, arguments and attachment text across turns; MiniMax thinking replays
from the transcript via the kernel change. No-conversation fallback keeps the
pre-I2 assembly path.
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摘要
P2 上下文保真 · 增量 I2：内核会话记录成为直连路径的权威跨轮上下文（用户裁定 2）。
组件：Agent-Native #41（思考捕获/回放，已合入）+ 本 PR。Dev 任务卡 feature/agent-quality-phase02。
真实模型三方对照（同 golden 集：P1 后 → I1 后 → I2 后）
pm-tool：工具 20→19→12、检查失败 4→0→0、终稿声称缺章节 0→3→0。
读原件归零属预期（原件全文已在转录上下文中）。报告：Dev 任务卡
.task/phase02-eval/。Evidence
go vet+go test ./...通过Impact
行为：跨轮上下文全保真；无契约/存储变更（transcript 新增 thinking 字段，旧文件兼容）。无沙箱会话回落旧组装路径。