[jasontopia]

Intent

继续 Learn FirstMate 教程，写第五章。前四章已写完（第一、二章已合入主分支，第三、四章正在走质检流水线）。README 的学习路线图里，第五章的定位是：为什么默认必须船长点头才合并，yolo 姿态放开了什么、没放开什么，以及红色 CI 为什么依然不能合。第五章也是「沿着一件活的真实旅程往下走」这条线（第 2 到 5 章）的最后一章。

What Changed

• 新增 chapters/05-pr-merge-authority.md：讲清默认必须船长点头才能合并 PR、yolo 姿态只放开合并权限而不放开质检标准、红色 CI 在任何设置下都不可合并（仅 fm-pr-merge.sh --allow-red 可豁免船长当下明确点名的单项检查），并引用本仓库自身 PR 的合并状态作为佐证，附两个只读动手练习。
• 更新 README.md 的路线图表格，将第 5 章状态从「待写」改为「已写」并链接到新章节文件。

Risk Assessment

✅ Low: Pure documentation addition (new chapter 5 plus a README roadmap link update) with no code, build, or config changes; every behavioral claim traces to AGENTS.md text I verified directly in the local FirstMate checkout, and the PR-status claims about PR #1/#3/#4 match actual GitHub state as of the commit timestamps; the docs check passes.

Testing

This is a documentation-only change (README nav line + new chapters/05-pr-merge-authority.md) in a repo explicitly defined as having no build system, dependency manifest, test framework, or runtime product to drive live. The configured baseline command, scripts/check-docs.py, was re-confirmed passing on the target commit. There is no live-exercisable end-user surface beyond this check, so no further scenarios could be driven against a running product.

• Live validation: ⚠️ no-surface - 0 of 2 scenarios driven live against the product

Scenario	Result	Live	Evidence
Reader follows README roadmap link into new Chapter 5	⏸️ untested	no	This repo is documentation-only with no build system, server, or app to run (per AGENTS.md); there is no live product surface to click through as an end user beyond the automated link/formatting check…
Chapter 5 content accurately reflects FirstMate's merge-authority/YOLO/CI behavior per authoritative source files	⏸️ untested	no	No executable interface exists to validate a natural-language accuracy claim; this is a content/sourcing review concern (already partly addressed by the prior no-mistakes review commit 34b7369), not s…

• Outcome: ⚠️ 1 warning across 1 run (27.5s)

Pipeline

Updates from git push no-mistakes

✅ **intent** - passed

✅ No issues found.

🔧 **Rebase** - 1 issue found → auto-fixed ✅

• ⚠️ README.md - merge conflict rebasing onto origin/main

🔧 Fix applied.
✅ Re-checked - no issues remain.

✅ **Review** - passed

✅ No issues found.

⚠️ **Test** - 1 warning

• ⚠️ this change has no live-validatable surface; proceed without live validation? (0 of 2 scenarios were driven live against the product); Reader follows README roadmap link into new Chapter 5: This repo is documentation-only with no build system, server, or app to run (per AGENTS.md); there is no live product surface to click through as an end user beyond the automated link/formatting check that already ran as baseline.; Chapter 5 content accurately reflects FirstMate's merge-authority/YOLO/CI behavior per authoritative source files: No executable interface exists to validate a natural-language accuracy claim; this is a content/sourcing review concern (already partly addressed by the prior no-mistakes review commit 34b7369), not something a live product run can confirm or deny.
• Live validation: ⚠️ no-surface - 0 of 2 scenarios driven live against the product

Scenario	Result	Live	Evidence
Reader follows README roadmap link into new Chapter 5	⏸️ untested	no	This repo is documentation-only with no build system, server, or app to run (per AGENTS.md); there is no live product surface to click through as an end user beyond the automated link/formatting check…
Chapter 5 content accurately reflects FirstMate's merge-authority/YOLO/CI behavior per authoritative source files	⏸️ untested	no	No executable interface exists to validate a natural-language accuracy claim; this is a content/sourcing review concern (already partly addressed by the prior no-mistakes review commit 34b7369), not s…

• python3 scripts/check-docs.py
• python3 scripts/check-docs.py (re-run on target commit 34b7369, exit 0, 10 markdown files, no problems found)

✅ **Document** - passed

✅ No issues found.

✅ **Lint** - passed

✅ No issues found.

✅ **Push** - passed

✅ No issues found.