chore: upgrade Rust toolchain to 1.93.1 and release 0.5.1

[soulgarden]

Summary

• upgrade Rust toolchain to 1.93.1 (rust-toolchain.toml, CI workflow, Docker builder image)
• bump project version to 0.5.1
• update runtime base image to alpine:3.23
• refresh dependencies and lockfile for latest stable compatible versions

Validation

• cargo fmt --all -- --check
• make lint
• make test (293 passed)
• make check
• docker build --platform linux/amd64 -f Dockerfile .

Notes

• This branch was used to build and publish image soulgarden/logfowd2:0.5.1.

Summary by CodeRabbit

• Chores

  • Bumped release version to 0.5.1
  • Upgraded Rust toolchain, core dependencies, and base container images

• Documentation

  • Streamlined README into a concise, task-oriented setup and development guide

• Tests

  • Hardened integration-test shutdown behavior for more reliable test runs

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

---

📝 Walkthrough

Walkthrough

This PR bumps the Rust toolchain to 1.93.1 across CI, toolchain, and Docker; upgrades multiple Cargo dependencies and the package VERSION to 0.5.1; condenses README content; and hardens an integration test shutdown sequence.

Changes

Cohort / File(s)	Summary
CI & Toolchain .github/workflows/main.yml, rust-toolchain.toml	Updated Rust toolchain from 1.91 to 1.93.1 and aligned cargo cache key.
Dependency & Version Cargo.toml, VERSION	Bumped package version 0.5.0→0.5.1; upgraded many dependencies (tracing, tokio, serde_json, reqwest, chrono, axum, tower, etc.) and adjusted feature sets.
Docker Dockerfile	Updated builder image rust:1.91-alpine→rust:1.93.1-alpine and runtime base alpine:3.22→alpine:3.23.
Docs README.md	Rewrote README to a condensed, task-oriented format replacing extensive architecture/deployment/detail sections.
Tests src/integration_tests.rs	Hardened watcher shutdown: replaced notify_one + short timeout with notify_waiters, a retry+sleep loop up to 2s, then await watcher with an extended timeout (5s).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Upgrade Rust to 1.91 and update dependencies #10: Similar changes to Rust toolchain, Cargo dependencies, Dockerfile, VERSION, and CI/test wiring.
• Bump version to 0.5.0, update dependencies, and pin Rust 1.91 in CI #12: Overlaps updates to CI workflow, rust-toolchain, Dockerfile, and dependency/version bumps.

Poem

🐰 Hopped from 1.91 to 1.93,
New crates and images follow me.
Tests now wait with patient cheer,
README trimmed to keep things clear.
Tiny paws, big updates — hop! 🥕

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: upgrading Rust toolchain to 1.93.1 and releasing version 0.5.1, which are the primary objectives evident across rust-toolchain.toml, Cargo.toml, VERSION, and related configuration files.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch release/v0.5.1

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[coderabbitai]

🤖 Fix all issues with AI agents

Verify each finding against the current code and only fix it if needed.


In `@Cargo.toml`:
- Around line 13-14: The Cargo.toml currently specifies both serde = { version =
"1.0.228", features = ["derive"] } and serde_derive = "1.0.228", which is
redundant because the "derive" feature on serde re-exports serde_derive; remove
the separate serde_derive dependency entry so only serde with features =
["derive"] remains to avoid duplication.

In `@README.md`:
- Line 90: Replace the hardcoded test count and date in the README line "Tests:
293 unit/integration tests (as of Feb 16, 2026)" with a maintenance-friendly
phrase; for example change to "Tests: ~300 unit/integration tests" or "Tests:
300+ unit/integration tests" or remove the date entirely so the README no longer
requires manual updates when tests change—locate the exact string in README.md
and update it accordingly.

🧹 Nitpick comments (2)

🤖 Fix all nitpicks with AI agents

Verify each finding against the current code and only fix it if needed.


In `@Cargo.toml`:
- Around line 13-14: The Cargo.toml currently specifies both serde = { version =
"1.0.228", features = ["derive"] } and serde_derive = "1.0.228", which is
redundant because the "derive" feature on serde re-exports serde_derive; remove
the separate serde_derive dependency entry so only serde with features =
["derive"] remains to avoid duplication.

In `@README.md`:
- Line 90: Replace the hardcoded test count and date in the README line "Tests:
293 unit/integration tests (as of Feb 16, 2026)" with a maintenance-friendly
phrase; for example change to "Tests: ~300 unit/integration tests" or "Tests:
300+ unit/integration tests" or remove the date entirely so the README no longer
requires manual updates when tests change—locate the exact string in README.md
and update it accordingly.

Cargo.toml (1)

13-14: Nit: serde_derive is redundant when serde has features = ["derive"].

The derive feature on serde already re-exports serde_derive. Having both is harmless but unnecessary. This is pre-existing, so no action needed in this PR — just flagging for awareness.

♻️ Optional cleanup (can be done in a follow-up)

 serde = { version = "1.0.228", features = ["derive"] }
-serde_derive = "1.0.228"

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@Cargo.toml` around lines 13 - 14, The Cargo.toml currently specifies both
serde = { version = "1.0.228", features = ["derive"] } and serde_derive =
"1.0.228", which is redundant because the "derive" feature on serde re-exports
serde_derive; remove the separate serde_derive dependency entry so only serde
with features = ["derive"] remains to avoid duplication.

README.md (1)

90-90: Hardcoded test count and date will become stale.

The specific count "293" and date "Feb 16, 2026" will require manual updates whenever tests are added/removed. Consider a more generic phrasing like "~300 unit/integration tests" or removing the date, to reduce maintenance burden.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@README.md` at line 90, Replace the hardcoded test count and date in the
README line "Tests: 293 unit/integration tests (as of Feb 16, 2026)" with a
maintenance-friendly phrase; for example change to "Tests: ~300 unit/integration
tests" or "Tests: 300+ unit/integration tests" or remove the date entirely so
the README no longer requires manual updates when tests change—locate the exact
string in README.md and update it accordingly.