Command-line mode: The Command Sigils (:wq) + The Great Substitution (:%s)

[StrangeNoob]

Summary

The medium engine feature the gap analysis ranked highest — command-line mode — plus the two lessons it unlocks. This game now teaches you how to exit vim. With it, Acts I–III cover the vimtutor consensus core completely; everything remaining is Act IV power tools (visual mode, ., text objects, marks, registers, macros).

New lessons (22/29 shipped)

Act	Lesson	Teaches
III · 20	The Command Sigils	:w :wq :q!
III · 21	The Great Substitution	:s/old/new → :%s → /g flag

Engine

• ModeCmdline via : — typing, backspace, esc-cancel, enter-execute, mirroring search mode; the HUD echoes the pending command
• New commandRun goal type: met when the player executes exactly :command; :w/:q/:wq/:q! are recorded no-ops (there's no file to write) — validated by the content integrity test
• :s/old/new[/g] and :%s/old/new[/g]: current-line or whole-buffer, first-match or global, undoable, cursor clamped when lines shorten. Plain-text patterns (no regex) — documented simplification
• 16 new engine test cases + a UI test that the HUD echoes :w (TDD throughout)

Placement note

The plan had these in Act IV, but the content invariant "every act's final lesson carries the act's boss" means Act IV can't start boss-less. They live in Act III instead (where :%s sat in the original roadmap); Power Surge slides to order 22 (id frozen — saves survive). Act IV stays the pure automation world.

Test plan

• go test ./... green (incl. all 22 lessons solvable at par)
• go vet, gofmt -l clean
• Binary builds; version smoke run

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1e867728-f58a-47d4-9f26-e31759af3d29

📥 Commits

Reviewing files that changed from the base of the PR and between 71ecbf6 and 9ed189c.

⛔ Files ignored due to path filters (1)

• docs/lessons.csv is excluded by !**/*.csv

📒 Files selected for processing (15)

• README.md
• assets/lessons/act3-20-the-command-sigils.json
• assets/lessons/act3-21-the-great-substitution.json
• assets/lessons/act3-22-power-surge.json
• docs/LESSON-GAP-ANALYSIS.md
• docs/LESSONS.md
• internal/content/loader_test.go
• internal/content/solvable_test.go
• internal/engine/cmdline.go
• internal/engine/cmdline_test.go
• internal/engine/engine.go
• internal/engine/goal.go
• internal/engine/search.go
• internal/ui/cmdline_hud_test.go
• internal/ui/room.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/command-line-mode

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[StrangeNoob]

CodeRabbit CLI review disposition (3 findings):

• Rune-unsafe backspace (minor): fixed at the root. The same byte-slicing bug pre-existed in search input, so both : and / now share trimLastRune, with a regression test proving é + backspace leaves no corrupt byte behind.
• Power Surge stale id (critical): intentionally skipped — frozen-id design (saves key on ids), documented in LESSONS.md and enforced unique by the loader test added in PR Five new lessons: the consensus pack (A/I/^, e, r/~/J, */N, f/;/,) #6. No collision exists; the suite is green.
• README boss annotation (minor): skipped — no act row in that table annotates its boss (Acts I/II included); adding it to one row would create the inconsistency the finding claims to fix. Boss info lives in the table's footer text and the ASCII map above.