Add TODO.md

TODO.md

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+# Status
+
+1.0+
+
+Tagged v1.0.0 (2024-06-14) and 1.0.1 (2026-02-08). In post-1.0
+maintenance; the library is referenced by the Go styleguide.
+
+# Next Step
+
+Bring the Makefile up to policy in one commit: add fmt-check, check, and
+hooks targets (test/lint/fmt/docker exist) and add the missing policy
+files it depends on: .golangci.yml, REPO_POLICIES.md, .editorconfig,
+.dockerignore, and .gitea/workflows/check.yml running make check.
+
+# Completed Steps
+
+* 2026-02-08: fixed JSONHandler deadlock from recursive log.Println,
+    with regression test; tagged 1.0.1
+* 2024-06-14: 1.0 prep: lint and fmt enforced in Docker build, call
+    stack depth fix so log locations report correctly, example script,
+    removed non-building RELP code; tagged v1.0.0
+* 2024-05-22: module path moved to sneak.berlin/go/simplelog
+* 2024-05-14: initial library: slog-based console, JSON, webhook, and
+    RELP handlers, MultiplexHandler, caller file/line info, UTC ISO
+    timestamps, level-colored output
+
+# Future Steps
+
+* Rewrite the Dockerfile to run make check with sha256-pinned base
+    images (currently golangci/golangci-lint:latest and golang:1.22,
+    unpinned, duplicating Makefile logic instead of calling it)
+* Restructure README.md into the standard sections: Description,
+    Getting Started, Rationale, Design, TODO, License, Author
+* Delete the old plain TODO file once this TODO.md lands
+* Add .aider.* to .gitignore and remove the stray aider artifacts from
+    the working tree
+* Pick one tag scheme before the next release (v1.0.0 vs 1.0.1 are
+    inconsistent)
+* Fix RELP output to cache (from old TODO)
+* Re-add RELP delivery over TCP to remote rsyslog imrelp; removed
+    2024-06-14 because it did not build (README planned feature)
+* Add regex filtering for webhook logs (from old TODO)
+* Better console output format (from old TODO)