[Repo Assist] docs: draft CHANGELOG entry for v0.0.10 release preparation

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🤖 This is an automated draft pull request from Repo Assist.

Summary

Adds a proposed ## 0.0.10 (unreleased) section to CHANGELOG.md capturing all the bug fixes that are ready to ship from the open Repo Assist PRs.

Motivation

The extension is currently at v0.0.9. Numerous significant fixes are sitting in open draft PRs (most importantly PR #106 — the consolidated critical-bug-fix PR). Before the maintainer merges those PRs and bumps the version, having the release notes drafted in one place makes it easy to see what's going into the release and whether anything is missing.

What's included in the draft entry

All fixes cross-referenced from the open Repo Assist PRs:

Fix	Relevant PR(s)
Promise hang on exit code 0	#106
Always close stdin	#90, #92, #106
fs.exists async race in addRootPath()	#51, #117, #106
Path resolution in phpcbf.standard	#65, #106
resolve([]) instead of reject() in provider	#88, #106
Exit code 3 stdout capture fix	#124, #106
Per-document phpcbf.onsave	#68, #106
Settings reload filter	#86, #106
cwd: TmpDir in spawn	#73, #106
Windows path separator fix	#106
Temp file cleanup on error	#106
console.group/time crash with debug mode	#124
phpcbf.enable operator precedence	#114
findFiles workspace escape prevention	#94
.vscodeignore improvements	#112

What the maintainer needs to do before merging

1. Merge the relevant code PRs (starting with [Repo Assist] fix: consolidate critical bug fixes (pre-v0.0.10) #106, the consolidated fix PR)
2. Bump "version" in package.json to "0.0.10" (protected file — must be done manually)
3. Update the (unreleased) date in this CHANGELOG entry
4. Then merge this PR

Test Status

✅ npm run test:unit — 7/7 tests pass (CHANGELOG.md is documentation only, no code change).

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