chore: prepare release 0.7.6

[steipete]

Summary

• date the 0.7.6 changelog and document the CrawlKit and TruffleHog maintenance updates
• update pinned Linux package examples to 0.7.6

Verification

• GOWORK=off go test ./...
• make build
• goreleaser release --snapshot --clean --skip=publish
• verified all snapshot checksums
• source-blind packaged macOS arm64 smoke: version, doctor/status JSON, bounded no-hit search, invalid-format rejection, and unchanged archive row counts

[clawsweeper]

ClawSweeper status: review started.

I am starting a fresh review of this pull request: chore: prepare release 0.7.6 This is item 1/1 in the current shard. Shard 0/1.

This placeholder means the worker is alive and reading the current context. I will edit this same comment with the actual review when the claws are done clicking.

Crustacean status: shell secured, claws on keyboard, evidence pebbles being sorted.