Restrict pull request workflows to main

[Goryudyuma]

Summary

• Restrict all eight pull request-triggered workflows to pull requests targeting main.
• Make pull request activity types explicit for workflows that use the default opened, synchronize, and reopened events.
• Keep closed handling only in workflows that perform explicit close-event processing.

Root cause

The workflows used inconsistent pull_request filters. Some lacked a base-branch filter, while others relied on implicit activity-type defaults, making the intended trigger behavior difficult to audit.

Validation

• git diff --check
• Verified every pull_request trigger in .github/workflows has branches: - main.
• Verified the activity types are explicit and appropriate to each workflow's behavior.

[github-actions]

Super-linter summary

Language	Validation result
BASH	Pass ✅
BASH_EXEC	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITHUB_ACTIONS_ZIZMOR	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
JAVASCRIPT_ES	Pass ✅
JAVASCRIPT_PRETTIER	Pass ✅
JSON	Pass ✅
JSON_PRETTIER	Pass ✅
MARKDOWN	Pass ✅
MARKDOWN_PRETTIER	Pass ✅
NATURAL_LANGUAGE	Pass ✅
PRE_COMMIT	Pass ✅
RENOVATE	Pass ✅
SHELL_SHFMT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
TYPESCRIPT_ES	Pass ✅
TYPESCRIPT_PRETTIER	Pass ✅
YAML	Pass ✅
YAML_PRETTIER	Pass ✅

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