Add v0.1.0 release notes

Author: avirajkhare00

docs/releases/v0.1.0.md

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+# Transformer Runtime Lab v0.1.0
+
+First software release for JOSS submission.
+
+This release freezes the repository state for the `Transformer Runtime Lab`
+software paper and the browser-local PSVM demos.
+
+## Included in this release
+
+- exact browser-local Sudoku runtime with model-guided branch ranking
+- browser-local invoice total extraction with legal money candidate ranking
+- browser-local Tally-style voucher extraction with schema-aligned field
+  candidates and deterministic resolver logic
+- smaller Weiqi PSVM prototype
+- JOSS submission package:
+  - `paper.md`
+  - `paper.bib`
+  - `paper.pdf`
+  - `CITATION.cff`
+- arXiv package notes and PSVM paper drafts under `docs/`
+
+## Release intent
+
+This tag is intended to be the first stable archival point for software-paper
+submission. It freezes the artifact, citation metadata, and submission-facing
+docs before any larger post-submission changes.