Add Windows Event Log (EVTX) parser

[copyleftdev]

Implements the EVTX plugin — issue #13 (the binary Windows Event Log format).

What

The BinXML chunk decoding is delegated to the evtx crate, which yields one
serde_json::Value per event plus the record id and timestamp. EvtxParser
flattens each event into dotted columns (Event.System.EventID,
Event.System.Provider.#attributes.Name, Event.EventData.TargetUserName, …)
and synthesizes eventRecordId and timestampEpoch (Unix seconds, via jiff's
as_second). That gives the detectors what the issue asks for:
Event.System.EventID for rare event-ID point detection and logon dist
drift, timestampEpoch for off-hours contextual (--period 24).

Determinism

The evtx crate decodes chunks in parallel but yields records in file order,
and parsing is pure — so output is byte-identical regardless of thread count.

Feature gating

Behind the default-on evtx feature (mirrors the polars-gated binary
readers), so the text-only --no-default-features build stays lean and
dependency-light. Verified both builds compile and test.

Routing

• Binary magic ElfFile\0 (confidence MAGIC); extension .evtx.

Testing

• A hand-built valid empty EVTX header (4096-byte file header, no chunks)
  roundtrips to zero rows — exercising the real crate integration.
• The per-record extraction is unit-tested via record_to_row on EVTX-shaped
  JSON (a records fixture would require committing a binary blob; the extraction
  is the only hand-written, mutation-relevant logic).
• Bad magic / truncated input are clean AxError::Parse.

Gates

• fmt / clippy -D warnings / full workspace tests green (default and
  --no-default-features).
• Mutation gate: 0 surviving mutants on evtx.rs (clean first pass).

Closes #13

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: baeb32c3-833f-4959-b2fd-b6494df99af7

📥 Commits

Reviewing files that changed from the base of the PR and between f358611 and 58c5b2b.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• crates/ax-normalize/Cargo.toml
• crates/ax-normalize/src/parser.rs
• crates/ax-normalize/src/parsers/evtx.rs
• crates/ax-normalize/src/parsers/mod.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/evtx

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