chore: sync canonical issue triage templates

[DerekCorniello]

Summary

• add the canonical issue-template config
• add the shared needs triage bootstrap manifest
• add the organization issue-triage workflow

This is the only repository with verified canonical template drift. No example behavior changes.

Verification

• git diff --check
• canonical template sync dry-run/apply validation
• no Co-authored-by trailer

[greptile-apps]

Greptile Summary

This PR synchronizes the repository’s canonical issue-triage configuration and strengthens example-runner cleanup and CI validation.

• Adds the issue-template configuration and needs triage label manifest.
• Adds an issue-triage workflow that ensures external issues receive the triage label while removing it from insider-filed issues.
• Ensures generated example artifacts and temporary diff files are cleaned up.
• Adds a CI check for compiled executables left in the examples tree.
• Consolidates repository guidance in AGENTS.md.

Confidence Score: 5/5

The PR appears safe to merge.

The previously reported triage omission is fixed because every non-insider issue now reaches the idempotent label-application path, and no blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/issue-triage.yml	The unconditional non-insider labeling branch resolves the previously reported case where an existing repository label caused the opening issue to be omitted from triage.
scripts/run-examples.sh	Adds direct-directory validation, generated-file cleanup, and securely allocated temporary diff files without changing the runner’s validation contract.
.github/workflows/examples.yml	Adds a post-run guard that fails CI if compiled example executables remain in the checkout.
.github/ISSUE_TEMPLATE/config.yml	Adds the canonical issue-template configuration with blank issues disabled and a documentation contact link.
.github/labels.yml	Adds the bootstrap manifest for the triage label required by issue automation.
AGENTS.md	Condenses contributor guidance while retaining the principal example determinism, output-review, and quality-gate requirements.

_{Reviews (2): Last reviewed commit: "fix: label all external issues for triag..." | Re-trigger Greptile}