docs(spec): translate plan.md and add bilingual cross-links to zh_cn/

Final batch (4 of 4) of the zh→en translation pass:

Part A — D-class plan translation:
  - plan.md (force-added past .gitignore; the project-internal
    plan.md is normally a working-tree artifact, but for the
    project-spec series it must be tracked alongside 00-06/98/99)

Part B — bilingual cross-links into zh_cn/ (20 files):
  Inserts `> English version: ../<filename>.md` line at the top
  of each of the 20 Chinese files (idempotent — skip-if-present),
  matching the existing `> Chinese version: ./zh_cn/<filename>.md`
  header on every translated English file:

    - 00-overview-and-glossary.md
    - 01-requirements-spec.md
    - 02-architecture-analysis.md
    - 03-freebsd-15-changes.md
    - 04-diff-and-port-strategy.md
    - 05-implementation-plan.md
    - 06-test-and-acceptance-spec.md
    - 98-independent-audit-report.md
    - 99-review-report.md
    - M1-execution-log.md / M2-execution-log.md /
      Phase-5b-execution-log.md / M3-execution-log.md /
      M4-execution-log.md / M5-execution-log.md
    - M5-test-report.md
    - M1-research-brief.md / M2-research-brief.md /
      M3-research-brief.md
    - plan.md

  Each zh_cn/ file got exactly +1 line of cross-link insertion;
  zero edits to any other Chinese content.

Project translation pass summary (across batches 1-4):

  - 20 English files added under
    `docs/freebsd_13_to_15_upgrade_spec/` (flat, sibling of
    `zh_cn/` subdir, per DP-target-dir=B)
  - 20 zh_cn/ files patched with English-version cross-link
  - 4 git commits (per DP-execution-mode=B):
      Batch 1: 9 A-class specs (00-06 / 98 / 99)
      Batch 2: 6 execution logs + 1 test report
      Batch 3: 3 research briefs
      Batch 4: 1 plan + 20 zh_cn cross-links
  - All file paths, function/symbol names, Git commit hashes,
    decision-point IDs (DP-xxx, R-xxx, T-xxx, TC-01..09),
    KNOB names, FSTACK markers, file sizes, .o counts and other
    numeric facts preserved verbatim
  - All deletions during the pass went through
    /data/workspace/rm_tmp_file.sh (DP-10 + DP-10-reinforce);
    zero direct rm invocations
  - All commit messages in English (per AI memory id 73362122)

The English Spec series can now serve international developers and
upstream-back-port reviewers alongside the Chinese master.

Author: jfb8856606

docs/freebsd_13_to_15_upgrade_spec/plan.md

@@ -0,0 +1,179 @@
+# F-Stack FreeBSD 13.0 → 15.0 Upgrade Spec Work Plan
+
+> Chinese version: ./zh_cn/plan.md (full prose detail)
+>
+> Doc series root: `/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/`
+> Document version: v0.1 (2026-05-26; §1.3 / §8 status updated 2026-05-28)
+> Author: Leader (in main dialogue)
+>
+> NOTE: This English version is a structural condensation. All section headings, sub-section IDs, deliverable list, agent-team role definitions, phase order, decision-point IDs (DP-1..5), and the 5 external-research items are preserved verbatim from the Chinese master.
+
+---
+
+## 0. Plan Goals
+
+### Deliverables (must end up under `freebsd_13_to_15_upgrade_spec/zh_cn/`)
+
+The 9-doc spec set: `plan.md`, `00-overview-and-glossary.md`, `01-requirements-spec.md`, `02-architecture-analysis.md`, `03-freebsd-15-changes.md`, `04-diff-and-port-strategy.md`, `05-implementation-plan.md`, `06-test-and-acceptance-spec.md`, `99-review-report.md` (later supplemented with `98-independent-audit-report.md` v0.2 on 2026-05-28; and English-version translations under the parent directory).
+
+---
+
+## 1. Workspace State and Boundaries (measured, not guessed)
+
+### 1.1 Three source-tree roots
+
+| Path | Role | Version |
+|---|---|---|
+| `/data/workspace/freebsd-src-releng-13.0/` | Community FreeBSD 13.0 | RELEASE-p2 |
+| `/data/workspace/freebsd-src-releng-15.0/` | Community FreeBSD 15.0 | RELEASE-p9 |
+| `/data/workspace/f-stack/` | F-Stack project root | adapted from 13.0 |
+
+### 1.2 13.0 original backup (exists)
+
+`/data/workspace/freebsd-src-releng-13.0/f-stack-lib/` — 25 freebsd + 22 tools subdirectories.
+
+### 1.3 15.0 original backup (**created in Phase 1.4, 2026-05-26**)
+
+`/data/workspace/freebsd-src-releng-15.0/f-stack-lib/` — 25,044 files (`freebsd/` 24,593 + `tools/` 451 + INVENTORY.md). Status status corrected 2026-05-28: this directory exists.
+
+### 1.4 F-Stack already-adapted directories (core upgrade subject)
+
+f-stack/freebsd/ (102 diffs vs 13.0 backup) + f-stack/tools/ (163 diffs).
+
+### 1.5 `f-stack/lib/` scope to include in upgrade (**q2-corrected precise boundary**)
+
+30 `.c` + 14 `.h` = 44 ff_* glue files; precise inventory in 02 §4.
+
+### 1.6 13.0 ↔ 15.0 sys-top-level diff (measured)
+
+(Full table in Chinese master; see 04 §1 for the per-subdir authoritative diff -rq stats added 2026-05-28.)
+
+---
+
+## 2. Agent Team Composition (hybrid mode)
+
+### 2.1 Leader (executed in main dialogue)
+
+| Item | Detail |
+|---|---|
+| Role | Leader |
+| Responsibility | Owns the whole plan; orchestrates 3 subagents; writes the 7 specs and 99 report; handles user q&a; final sign-off |
+| Implementation | Main dialogue only (no `Task` spawn) |
+
+### 2.2 Sub-Agent A: Analyzer-13 (code-explorer subagent)
+
+| Item | Detail |
+|---|---|
+| Role | Analyzer-13 |
+| Responsibility | Measure F-Stack adaptation footprint vs the 13.0 baseline; produce the 9-pattern adaptation inventory (H-1..H-9) |
+| Implementation | `Task` tool → `code-explorer` subagent (read-only) |
+
+### 2.3 Sub-Agent B: Analyzer-15 (code-explorer + web research)
+
+| Item | Detail |
+|---|---|
+| Role | Analyzer-15 |
+| Responsibility | Measure 13→15 upstream changes in `sys/` + external research (FreeBSD release notes / mailing lists / commit logs / blogs) for 14.0+ ABI/KPI breakage |
+| Implementation | `Task` tool → `code-explorer` subagent + `web_search` / `web_fetch` |
+
+### 2.4 Sub-Agent C: Diff-Comparator (code-explorer subagent)
+
+| Item | Detail |
+|---|---|
+| Role | Diff-Comparator |
+| Responsibility | Cross-cut Sub-Agent A + B outputs; produce the `04-diff-and-port-strategy.md` per-file port-task table |
+| Implementation | `Task` tool → `code-explorer` subagent (read-only) |
+
+### 2.5 Spec-Writer & Reviewer (Leader concurrent in main dialogue)
+
+| Item | Detail |
+|---|---|
+| Role | Spec-Writer + Reviewer |
+| Responsibility | Spec-Writer drafts 00-06 + 99 + 98 from Sub-Agent A/B/C inputs; Reviewer reviews internally |
+| Implementation | Leader in main dialogue executes both |
+
+---
+
+## 3. Execution Steps (chronological)
+
+### Phase 1: Material readiness (Leader in main dialogue)
+
+1.1 Probe workspace
+1.2 Create output directory `f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
+1.3 Produce `plan.md` (this document)
+1.4 **Create 15.0 backup** `/data/workspace/freebsd-src-releng-15.0/f-stack-lib/` (cp -a + INVENTORY.md generation)
+
+### Phase 2: Parallel research (spawn 3 code-explorer subagents)
+
+2.A Sub-Agent A executes Analyzer-13
+2.B Sub-Agent B executes Analyzer-15
+2.C Sub-Agent C executes Diff-Comparator
+
+### Phase 3: Produce 7 spec docs (Leader+Spec-Writer in main dialogue)
+
+3.1 00-overview-and-glossary.md
+3.2 01-requirements-spec.md
+3.3 02-architecture-analysis.md
+3.4 03-freebsd-15-changes.md
+3.5 04-diff-and-port-strategy.md
+3.6 05-implementation-plan.md
+3.7 06-test-and-acceptance-spec.md
+
+### Phase 4: Reviewer audit (Leader+Reviewer)
+
+Audit the 7 specs along 4 dimensions (consistency / completeness / risk coverage / executability) and produce 99-review-report.md.
+
+### Phase 5: Delivery report
+
+Aggregate the 9 deliverables; explicit "no git / no source change" declaration; pointer to M1 implementation entry.
+
+---
+
+## 4. Risks and Key Decision Points
+
+### 4.1 Identified risks (each elaborated by the spec docs)
+
+(See 03 §7 for the full panorama: R-001 mips / R-002 netlink / R-003 mbuf / R-004 RACK / R-005 pkgbase / R-006 KTLS / R-007 ABI break / R-008 baseline drift / R-009 clang/llvm / R-010 inotify-OOS / R-011 pr_usrreqs / R-012 inpcb SMR / R-013 if_t opaque.)
+
+### 4.2 Key decision points (must be answered explicitly when writing specs in Phase 3)
+
+| DP | Decision | Default tendency |
+|---|---|---|
+| DP-1 | Whether to delete `f-stack/freebsd/mips/` | **Delete** |
+| DP-2 | Whether to pull sys/netlink/ into f-stack/freebsd/ | **Do NOT introduce** |
+| DP-3 | Sync strategy: big-bang full sync vs progressive | **Progressive (M1→M5)** |
+| DP-4 | Whether ff_*.c is upgraded in lockstep with f-stack/freebsd | **Must be in lockstep** |
+| DP-5 | Whether tools/ upgrade is its own milestone | **Independent M5** |
+
+---
+
+## 5. Relationship with Existing F-Stack Docs
+
+(See 00 §6 / 02 §5 for the full mapping. Summary: reuse the 3-layer architecture docs + knowledge-graph; do NOT reuse ld_preload_ring_spec/ workstream.)
+
+---
+
+## 6. External Research Inventory (for Analyzer-15)
+
+5 items (see Chinese master for the full URL inventory): (1) FreeBSD 14.0R/14.1R/14.2R/14.3R/14.4R/15.0R release notes; (2) `pr_usrreqs` merge phabricator review; (3) `inpcb` SMR migration commits + design; (4) `if_t` opaque-ization design; (5) `routing/rib/nexthop` rewrite (D26577).
+
+---
+
+## 7. Things Out of Scope of This Plan
+
+| Item | Note |
+|---|---|
+| Actual code migration and build verification | Spec phase only; later phases handle |
+| Performance benchmarks / stress tests | No binary built |
+| Git commit / push | Only working-tree files written |
+| English Spec | (Later satisfied by the English translation pass — see 99 §1 final-review entry) |
+| 15.0 new-capability ports (netlink port / ML-KEM / inotify / timerfd / kqueuex / membarrier) | "Alignment only, no capability extension" |
+| F-Stack `adapter/syscall/` | Independent workstream `docs/ld_preload_ring_spec/` |
+
+---
+
+## 8. Pacing Control (harness-engineering-orchestrator style)
+
+(Plan finished entirely on 2026-05-26; on 2026-05-28 entered audit-revision phase + v0.2 independent audit; on 2026-05-29 M1-M5 implementation closed and project final delivery PASS.)
+
+**Current status (2026-05-29 / project closure)**: Phase 1-5 + v0.2 audit all delivered; M1-M5 implementation all done; G-Acceptance PASS. The plan has been fully executed.

docs/freebsd_13_to_15_upgrade_spec/zh_cn/00-overview-and-glossary.md

@@ -1,5 +1,7 @@
 # 00 — 项目概览与术语表
 
+> English version: ../00-overview-and-glossary.md
+
 > 文档语言：中文（首版）
 > 系列文档根目录：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）

docs/freebsd_13_to_15_upgrade_spec/zh_cn/01-requirements-spec.md

@@ -1,5 +1,7 @@
 # 01 — 升级需求规约（Requirements Spec）
 
+> English version: ../01-requirements-spec.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）
 > 前序：`00-overview-and-glossary.md`

docs/freebsd_13_to_15_upgrade_spec/zh_cn/02-architecture-analysis.md

@@ -1,5 +1,7 @@
 # 02 — F-Stack 当前架构分析（对 FreeBSD 13.0 的改造点全景）
 
+> English version: ../02-architecture-analysis.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）
 > 数据来源：**Sub-Agent A（Analyzer-13）** 实测调研产物 + leader 后续整理

docs/freebsd_13_to_15_upgrade_spec/zh_cn/03-freebsd-15-changes.md

@@ -1,5 +1,7 @@
 # 03 — FreeBSD 13.0 → 14.x → 15.0 关键变更清单
 
+> English version: ../03-freebsd-15-changes.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）
 > 数据来源：**Sub-Agent B（Analyzer-15）** 调研产物 + 本地双版本源码实测对比

docs/freebsd_13_to_15_upgrade_spec/zh_cn/04-diff-and-port-strategy.md

@@ -1,5 +1,7 @@
 # 04 — 13↔15 差异分析与移植策略（Diff & Port Strategy）
 
+> English version: ../04-diff-and-port-strategy.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）
 > 数据来源：**Sub-Agent A + B + C 三路调研交叉** + 02 / 03 文档汇总

docs/freebsd_13_to_15_upgrade_spec/zh_cn/05-implementation-plan.md

@@ -1,5 +1,7 @@
 # 05 — 详细实施计划（Implementation Plan）
 
+> English version: ../05-implementation-plan.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）
 > 输入：`04-diff-and-port-strategy.md` 的 57 个 T-* 任务清单

docs/freebsd_13_to_15_upgrade_spec/zh_cn/06-test-and-acceptance-spec.md

@@ -1,5 +1,7 @@
 # 06 — 测试与验收 Spec（Test & Acceptance Spec）
 
+> English version: ../06-test-and-acceptance-spec.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）
 > 输入：`01-requirements-spec.md` FR-5 / FR-6 / NFR-1

docs/freebsd_13_to_15_upgrade_spec/zh_cn/98-independent-audit-report.md

@@ -1,5 +1,7 @@
 # 98 — Independent Audit Report（独立审计报告）
 
+> English version: ../98-independent-audit-report.md
+
 > 审计对象：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/` 下 9 份 Spec 文档，以及 Phase 1.4 产物 `/data/workspace/freebsd-src-releng-15.0/f-stack-lib/INVENTORY.md`
 > 审计时间：2026-05-26 19:45
 > 审计方式：独立复读文档 + 抽样核验本地源码事实 + 一致性/完整性/可执行性审查

docs/freebsd_13_to_15_upgrade_spec/zh_cn/99-review-report.md

@@ -1,5 +1,7 @@
 # 99 — Review Report（一致性 / 完整性 / 风险覆盖度 / 可执行性审查）
 
+> English version: ../99-review-report.md
+
 > 系列文档：`/data/workspace/f-stack/docs/freebsd_13_to_15_upgrade_spec/zh_cn/`
 > 文档版本：v0.1（2026-05-26）；v0.2（2026-05-28，追加独立审计修订记录 §12.1-§12.11）；**v0.3（2026-05-28，最终评审通过）**
 > 审查人：Leader 兼 Reviewer（按 plan.md §2.5 设定）