feat(fs5.5): extend zigos benchmark stress lane

[adybag14-cyber]

Summary by CodeRabbit

• New Features

  • Added two new filesystem benchmarks: persistence cycle and overlay read cycle performance measurements to expand benchmark coverage.

• Documentation

  • Updated project documentation to reflect expanded benchmark catalog, now including filesystem persistence cycle and overlay read cycle measurements alongside existing DNS, DHCP, TCP, runtime-state queue, and codec parsing benchmarks.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 56c19735-907c-441a-96c5-655d1d60a849

📥 Commits

Reviewing files that changed from the base of the PR and between 94ca07d and 629706b.

📒 Files selected for processing (6)

• README.md
• docs/zig-port/FS5_5_HARDWARE_DRIVERS_SYSTEMS.md
• docs/zig-port/PHASE_CHECKLIST.md
• docs/zig-port/PORT_PLAN.md
• docs/zig-port/ZAR_VS_ZIGOS_BENCHMARK_SLICE_PLAN.md
• src/benchmark_suite.zig

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📝 Walkthrough

Walkthrough

This PR expands the benchmark suite with two new filesystem benchmark cases—filesystem.persistence_cycle and filesystem.overlay_read_cycle—and updates all related documentation to reflect the enhanced coverage.

Changes

Cohort / File(s)	Summary
Documentation & Planning README.md, docs/zig-port/FS5_5_HARDWARE_DRIVERS_SYSTEMS.md, docs/zig-port/PHASE_CHECKLIST.md, docs/zig-port/PORT_PLAN.md, docs/zig-port/ZAR_VS_ZIGOS_BENCHMARK_SLICE_PLAN.md	Updated benchmark coverage listings across documentation to include the two new filesystem benchmark cases and restructured the "delivered" vs. "planned" categorization in the benchmark roadmap.
Benchmark Suite Implementation src/benchmark_suite.zig	Added import of baremetal/filesystem.zig, implemented two new benchmark functions (benchFilesystemPersistenceCycle and benchFilesystemOverlayReadCycle), registered both cases in the all_cases catalog with specified iteration counts, and updated tests to verify their presence.

Poem

🐰 Two new cycles hop into view,
One persists, one reads straight through,
Filesystem paths we now explore,
Benchmarks dancing more and more!

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fs55-ethernet-integration

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