fix: apply clippy fixes

[devin-ai-integration]

Summary

Ran cargo clippy --fix and verified no remaining clippy warnings in project code. Changes across 6 files:

• Cargo.toml: Exclude plugins/cli2 from workspace — the directory exists but its Cargo.toml was removed in a prior commit, breaking the plugins/* glob
• posthog.rs: Remove redundant &distinct_id.to_string() when distinct_id is already &str
• from_ast.rs, two fs-db migrations, version/macro.rs: Collapse nested if/if let blocks into let-chains (clippy collapsible_if / collapsible_match)
• Two fs-db migrations: Remove unnecessary explicit lifetime 'a on group_by_session_id (lifetime elision suffices)

Review & Testing Checklist for Human

• Verify the let-chain rewrites in from_ast.rs and version/macro.rs preserve the original control flow — especially that the fallthrough to result.push(c) in unescape_markdown still fires correctly when c == '\\' but the character is not escapable
• Confirm the project's Rust edition / toolchain supports let-chains (stabilized in Rust 1.87+; project pins 1.92.0)
• plugins/cli2 exclusion is correct — the directory only contains node_modules with no Cargo.toml

Notes

• External crate libspa fails to build on Linux due to a version mismatch with the system libpipewire-0.3. This blocks clippy from checking the tools crate. This is a pre-existing issue unrelated to this PR.
• macOS-only crates (objc2_app_kit, etc.) also can't be checked on Linux. All other workspace crates were checked with zero clippy warnings.

Link to Devin session: https://app.devin.ai/sessions/0c461d1399df4743963df3efc478e350

[devin-ai-integration]

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[ComputelessComputer]

Closing cargo clippy PR - no longer needed.