fix(ingest): serialize ingests + fix scan-all REPOS_DIR path leak

[hyperpolymath]

Summary

• scripts/scan-all.sh: The expression /var$REPOS_DIR concatenated a literal /var prefix with the variable, producing the literal string /var$REPOS_DIR when REPOS_DIR was unset. This leaked into program_path in every scans/*.json. Fixed with a proper guard: only use REPOS_DIR when it is non-empty and points to an existing directory.
• .github/workflows/ingest.yml: Concurrent repository_dispatch deliveries were racing on the commit+push step, causing one writer to lose. Added a concurrency group with cancel-in-progress: false to queue them instead of cancelling.

Rebased onto current main (d184b7f). Supersedes #40.

Test plan

• scripts/scan-all.sh — no more /var$REPOS_DIR expression; proper guard
• ingest.yml — concurrency block queues (not cancels) concurrent ingests
• No logic changes to the ingest step itself

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 74 issues detected

Severity	Count
🔴 Critical	0
🟠 High	12
🟡 Medium	62

View findings

[
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]

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