v0.1.0

Added

• Bounded .xlsx package inspection and reading from paths, byte slices, and Read + Seek
  streams, with ZIP, XML, workbook, formula, text, relationship, and allocation limits.
• Immutable sparse workbook snapshots with typed values, formulas, saved results, shared and array
  metadata, defined names, sheet visibility, date systems, number formats, diagnostics,
  and provenance.
• Package-backed .xlsx and .xlsm documents with exact SHA-256 source identity that preserve
  unknown and unchanged parts without executing macros, following external links, or reading
  host-time inputs.
• Static formula capability scans and deterministic recalculation into a separate owned result
  snapshot, including direct formula cells, legacy-array regions, and dynamic-spill regions.
• A catalog of 278 official Excel-facing function names, comprising 265 official calculation
  kernels and 13 compatibility aliases, plus one non-official OOXML dummy-function marker,
  workbook function-demand reports, and stable sample locations.
• Explicit deterministic inputs for TODAY() and NOW(), bounded calculation work, stable
  per-formula issue codes, and spreadsheet error values kept distinct from unsupported engine
  capabilities.
• Formula parsing and evaluation for scalar, range, lookup, logical, aggregate, math,
  trigonometric, combinatoric, engineering, information, text, date/time, dynamic-array,
  statistical, and financial function groups.
• Excel-compatible INDEX zero row/column references, including scalar implicit intersection,
  reference composition, incremental dependencies, and row, column, or full-rectangle array
  materialization.
• Capability detection for unsupported external, 3-D, structured, spill-postfix, data-table, and
  other statically recognizable out-of-scope formula forms.
• Verified recalculation writing that binds results to the exact source, updates typed caches,
  removes stale calculation chains, preserves unrelated package content, and supports strict or
  explicit cache-invalidation policy.
• Canonical workbook creation with dynamic-formula authoring, plus preservation-aware
  WorkbookDraft editing for typed cells, normal formulas, sheets, defined names, number formats,
  date systems, and calculation properties. Existing document-backed dynamic formulas can be
  recalculated and cache-rewritten, while adding or replacing them fails closed.
• Atomic typed edit batches with semantic revisions, complete rollback on validation failure,
  no-op revision and calculation preservation, and Save As path writes that refuse implicit
  destination replacement.
• SpreadsheetML phonetic annotation inspection and authoring, row/column phonetic-visibility
  handling, and default frozen-pane inspection and authoring under separate presentation revisions.
• Persistent WorkbookCalculationSession state with incremental recalculation, conservative full
  fallback, optimistic revision checks, request-owned cooperative cancellation, stale-result
  rejection, and bounded paged result deltas.
• Typed Python 3.10–3.14 bindings built with PyO3 and maturin.
• Typed Node.js 22+ CommonJS and ESM bindings built with napi-rs and exact-version native platform
  packages.
• Explicit, idempotent native-session cleanup through Python context managers and Python/Node.js
  close(), including cooperative cancellation of active calculation and stable closed-session
  errors.
• A local stdio-only MCP server with 11 high-level workbook tools, explicit approved roots,
  bounded TTL/LRU sessions, capability-bound bounded input reads, byte-bounded responses and
  resource pagination, cooperative cancellation, and capability-bound atomic Save As behavior.
• Stable validation, read, write, calculation, session, diagnostic, and spreadsheet-value error
  boundaries with machine-readable codes, including a core-owned ValidationErrorCode covering
  every current ValidationError variant.
• Runnable examples for inspection, capability scanning, error handling, saved-versus-calculated
  values, calculation, canonical authoring, recalculation Save As, dynamic arrays, phonetic
  inspection, and phonetic authoring.
• Generated workbook integration tests, binding conformance tests, MCP protocol tests, fuzz
  targets, MSRV checks, dependency-policy checks, package-consumer verification, and
  cross-platform CI.

Known limitations

• Public CI uses generated, redistributable workbook fixtures. The private external formula corpus,
  user workbook corpus, and native-producer evidence used during development are not distributed
  with 0.1.0 and are not represented as release gates.