refactor(test): use markdown for e2e snapshots (#342)

## Motivation

Render e2e snapshots as markdown so human review — on GitHub and in
editors — benefits from syntax highlighting and structural rendering.
The old `.snap` format packed everything into a custom line-prefix
convention (`[code]> cmd # comment`) that editors couldn't highlight and
diffs had to be read without any visual grouping. Each step is now an
`##` section with the command in backticks, comment and optional `**Exit
code:**` line, and a fenced code block for the redacted output;
interactions are bolded labels interleaved with fenced screen captures;
each file opens with an `#` heading carrying the case name.

## Changes

-
[crates/vite_task_bin/tests/e2e_snapshots/main.rs](crates/vite_task_bin/tests/e2e_snapshots/main.rs):
split display_command into command-line + comment accessors; rewrite the
interaction-loop and output-formatting blocks to emit markdown; change
snapshot extension from .snap to .md; add push_fenced_block helper.
- [.gitignore](.gitignore): add *.md.new alongside existing *.snap.new
so the mismatch fallback file is ignored.
- Regenerated all 148 e2e snapshots in the new format.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: branchseer

.gitignore

@@ -6,3 +6,4 @@ dist
 .DS_Store
 /.vscode/settings.json
 *.snap.new
+*.md.new

crates/vite_task_bin/tests/e2e_snapshots/fixtures/associate_existing_cache/snapshots.toml

@@ -1,4 +1,6 @@
-# Tests that tasks with identical commands share cache
+comment = """
+Tests that tasks with identical commands share cache
+"""
 
 [[e2e]]
 name = "associate_existing_cache"

crates/vite_task_bin/tests/e2e_snapshots/fixtures/associate_existing_cache/snapshots/associate_existing_cache.md

@@ -0,0 +1,40 @@
+# associate_existing_cache
+
+Tests that tasks with identical commands share cache
+
+## `vt run script1`
+
+cache miss
+
+```
+$ vtt print hello
+hello
+```
+
+## `vt run script2`
+
+cache hit, same command as script1
+
+```
+$ vtt print hello ◉ cache hit, replaying
+hello
+
+---
+vt run: cache hit.
+```
+
+## `vtt replace-file-content package.json '"script2": "vtt print hello"' '"script2": "vtt print world"'`
+
+change script2
+
+```
+```
+
+## `vt run script2`
+
+cache miss
+
+```
+$ vtt print world ○ cache miss: args changed, executing
+world
+```

crates/vite_task_bin/tests/e2e_snapshots/fixtures/associate_existing_cache/snapshots/associate_existing_cache.snap

@@ -1,4 +1,6 @@
-# Tests that synthetic tasks have separate cache per cwd
+comment = """
+Tests that synthetic tasks have separate cache per cwd
+"""
 
 [[e2e]]
 name = "builtin_different_cwd"

crates/vite_task_bin/tests/e2e_snapshots/fixtures/builtin_different_cwd/snapshots.toml

@@ -1,18 +1,45 @@
-> vt run cwd1 # cache miss in folder1
+# builtin_different_cwd
+
+Tests that synthetic tasks have separate cache per cwd
+
+## `vt run cwd1`
+
+cache miss in folder1
+
+```
 ~/folder1$ vt tool print-cwd
 <workspace>/folder1
-> vt run cwd2 # cache miss in folder2 (different cwd)
+```
+
+## `vt run cwd2`
+
+cache miss in folder2 (different cwd)
+
+```
 ~/folder2$ vt tool print-cwd
 <workspace>/folder2
-> vt run cwd1 # cache hit in folder1
+```
+
+## `vt run cwd1`
+
+cache hit in folder1
+
+```
 ~/folder1$ vt tool print-cwd ◉ cache hit, replaying
 <workspace>/folder1
 
 ---
 vt run: cache hit.
-> vt run cwd2 # cache hit in folder2
+```
+
+## `vt run cwd2`
+
+cache hit in folder2
+
+```
 ~/folder2$ vt tool print-cwd ◉ cache hit, replaying
 <workspace>/folder2
 
 ---
 vt run: cache hit.
+```

…cwd/snapshots/builtin_different_cwd.snap …t_cwd/snapshots/builtin_different_cwd.mdcrates/vite_task_bin/tests/e2e_snapshots/fixtures/builtin_different_cwd/snapshots/builtin_different_cwd.snap renamed to crates/vite_task_bin/tests/e2e_snapshots/fixtures/builtin_different_cwd/snapshots/builtin_different_cwd.md crates/vite_task_bin/tests/e2e_snapshots/fixtures/builtin_different_cwd/snapshots/builtin_different_cwd.snap renamed to crates/vite_task_bin/tests/e2e_snapshots/fixtures/builtin_different_cwd/snapshots/builtin_different_cwd.md

@@ -1,4 +1,6 @@
-# Tests that cache: false in task config disables caching
+comment = """
+Tests that cache: false in task config disables caching
+"""
 
 [[e2e]]
 name = "task_with_cache_disabled"

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache_disabled/snapshots.toml

@@ -0,0 +1,21 @@
+# task_with_cache_disabled
+
+Tests that cache: false in task config disables caching
+
+## `vt run no-cache-task`
+
+cache miss
+
+```
+$ vtt print-file test.txt ⊘ cache disabled
+test content
+```
+
+## `vt run no-cache-task`
+
+cache disabled, runs again
+
+```
+$ vtt print-file test.txt ⊘ cache disabled
+test content
+```

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache_disabled/snapshots/task_with_cache_disabled.md

@@ -0,0 +1,24 @@
+# task_with_cache_enabled
+
+Tests that cache: false in task config disables caching
+
+## `vt run cached-task`
+
+cache miss
+
+```
+$ vtt print-file test.txt
+test content
+```
+
+## `vt run cached-task`
+
+cache hit
+
+```
+$ vtt print-file test.txt ◉ cache hit, replaying
+test content
+
+---
+vt run: cache hit.
+```