release: prepare v0.3.3.dev0

[voorhs]

Prepares the v0.3.3.dev0 development pre-release.

Changes

• pyproject.toml version → 0.3.3.dev0
• docs/source/conf.py release → 0.3.3.dev0
• CHANGELOG.md section for 0.3.3.dev0, covering everything merged since v0.3.2:
  • feat(vector-index): OpenSearch copy-on-dump into immutable generation indices (#343) #346 — OpenSearch copy-on-dump into immutable generation indices (closes OpenSearch backend: dump() stores a reference to a mutable index — the served pipeline depends on whichever trial wrote last #343)
  • fix(vector-index): split reset() from clear_ram(); restore fit-replaces for OpenSearch (#342) #345 — clear_ram()/reset() contract split; fit-replaces restored for OpenSearch (closes OpenSearch backend: clear_ram=True breaks fit(), and CV leaks whole validation folds — one root cause #342)
  • fix(pipeline): write inference_config.yaml with yaml.safe_dump so tuple-valued config fields reload #344 — inference_config.yaml written with yaml.safe_dump so tuple-valued config fields reload
  • feat(deps): metadata-driven require(extra) dependency guard #339 — metadata-driven require(extra) dependency guard (closes bert scorer: opaque ImportError when accelerate is missing (require() guard checks only transformers) #322)

Verification

• make schema produces no diff — the configs/_vector_index.py change since v0.3.2 did not alter the generated optimizer JSON schema.
• 0.3.3.dev0 is valid PEP 440 and orders 0.3.2 < 0.3.3.dev0 < 0.3.3; pip/uv treat it as a pre-release, so it is not installed by default resolution.
• Package imports and reports 0.3.3.dev0 from installed metadata after uv sync.
• Docs build (make test-docs, make docs) left to CI on this PR.

Notes for release day

• The tag v0.3.3.dev0 will not appear in the docs version switcher: docs/source/docs_utils/versions_generator.py filters tags on ^v\d+\.\d+\.\d+$. That is the desired outcome for a dev release — no action needed.
• Publishing a GitHub Release for the tag triggers the PyPI publish in .github/workflows/release.yaml. Mark it as a pre-release on GitHub if you don't want it surfaced as the latest release.

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