Phase 1: Windows log collection + full-text search

Extends the agent, ingest, storage, api, and web with Windows Event
Log/ETW sourcing and Tantivy-backed free-text search, per the approved
Phase 1 plan.

- CLAUDE.md: materialized on disk (never existed as a file before) with
  a new Phase 1 "done looks like" section.
- agent: Windows Event Log (EvtSubscribe) and ETW sources, Windows
  service wrapper (install/uninstall/run-service), both feature- and
  target_os-gated so Linux builds/tests/clippy stay unaffected. Also
  fixed two pre-existing Phase 0 clippy gaps (dead-code on
  default-features-only builds, a type-inference edge case) found while
  testing every feature combination properly for the first time.
  UNVERIFIED on real Windows -- no Windows toolchain existed anywhere in
  the build environment; flagged prominently in three places.
- proto/ingest: new record_id field, assigned once server-side in
  ingest's gRPC front end so ClickHouse and Tantivy agree on the same ID
  for the same record.
- storage: record_id column + bloom filter index, verified against a
  live ClickHouse.
- search: new service, Tantivy index, rskafka consumer as an independent
  second consumer group on the same Redpanda topic ingest already reads.
- api/web: new /search endpoint and page, sharing the query page's
  result-table shape and component.
- hack/windows-fixture: sends realistic Windows-shaped data straight to
  ingest, so the pipeline's handling of it is verifiable without a
  Windows host.

Verified end-to-end on the live docker-compose stack: the same record_id
comes back from both /query and /search for the same log line, including
for windows-fixture's synthetic Windows Event Log data. Real bugs found
and fixed along the way: api/Dockerfile missing proto/ in its build
context, search's logs being completely silent (RUST_LOG gap), and
search/target/ missing from .gitignore/.dockerignore.

agent/sentry-agent/Cargo.toml

@@ -3,7 +3,7 @@ name = "sentry-agent"
 version.workspace = true
 edition.workspace = true
 license.workspace = true
-description = "Sentry distro-agnostic Linux log collector"
+description = "Sentry distro-agnostic Linux/Windows log collector"
 
 [[bin]]
 name = "sentry-agent"
@@ -13,6 +13,12 @@ path = "src/main.rs"
 default = ["journald"]
 journald = []
 file-tail = []
+# Windows-only sources. Feature-enabled AND target_os="windows"-gated at
+# the module level (see src/source/mod.rs), so enabling these on a
+# non-Windows build is a harmless no-op, not a build failure -- keeps
+# `cargo test --workspace --all-features` green on Linux CI.
+windows-eventlog = []
+etw = []
 
 [dependencies]
 sentry-parser = { path = "../sentry-parser" }
@@ -30,5 +36,18 @@ anyhow = "1"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
+# Windows-only: not in the dependency graph at all on other targets, so
+# they don't affect Linux build times or the musl release binary.
+[target.'cfg(windows)'.dependencies]
+windows = { version = "0.58", features = [
+    "Win32_Foundation",
+    "Win32_System_EventLog",
+    "Win32_System_Threading",
+    "Win32_System_Diagnostics_Etw",
+    "Win32_Security",
+] }
+windows-service = "0.7"
+quick-xml = "0.36"
+
 [build-dependencies]
 tonic-build = "0.12"