chore: ignore stray log files in the repository root

[YoungJinJung]

Summary

An MCP server run in the working directory left a 305 KB valkey-mcp-server.log in the repo root. It showed as untracked and git add -A would have committed it.

# Stray logs from tools run in the repo root; unic writes its own to ~/.config/unic/logs/
*.log

Why the broad rule is safe here

A blanket *.log can hide files someone meant to commit, so I checked both directions before reaching for it:

• Nothing is tracked today. git ls-files '*.log' is empty, so this changes nothing about existing history. (A rule cannot untrack a tracked file anyway — worth confirming there were none rather than assuming.)
• unic's own log is outside the repository. internal/log/log.go resolves logDir() to $XDG_CONFIG_HOME/unic/logs, falling back to ~/.config, and writes unic.log there. The rule never applies to it.

So the only thing this catches is exactly the class of file that prompted it.

Validation

Created valkey-mcp-server.log and a second some-tool.log in a clean tree:

$ git status --short
 M .gitignore          # only the rule itself

$ git check-ignore -v valkey-mcp-server.log
.gitignore:8:*.log	valkey-mcp-server.log

go build ./... and go test ./... pass, though neither exercises this file.

Closes #381

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 5e3c01b and 585d7cf.

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• .gitignore

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[amazon-q-developer]

This PR correctly adds *.log to .gitignore to prevent stray tool logs from being tracked. The change is well-justified and safe:

• No .log files are currently tracked in the repository
• unic's own logs are written outside the repo to ~/.config/unic/logs/
• The rule has been validated with git check-ignore

No blocking issues found. This is ready to merge.

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