feat(rss10): add syndication namespace with Python and Node.js bindings

[bug-ops]

Summary

Phase 3: RSS 1.0 validation and enhancement + Bindings support

Core Library

• Add Syndication Module namespace support (syn:updatePeriod, syn:updateFrequency, syn:updateBase)
• Add content:encoded namespace support to RSS 1.0 parser
• Create comprehensive RSS 1.0 integration tests (12+ test cases)
• Add is_syn_tag() helper for namespace detection

Python Bindings

• Add PySyndicationMeta wrapper class with PyO3 bindings
• Add syndication, dc_creator, dc_publisher, dc_rights getters to FeedMeta
• Performance optimized: Returns &str instead of String for enum values

Node.js Bindings

• Add SyndicationMeta struct with napi-rs bindings
• Add syndication and Dublin Core fields to FeedMeta
• Simplified Entry conversion using idiomatic .collect() pattern

New Files

Core

• crates/feedparser-rs-core/src/namespace/syndication.rs
• crates/feedparser-rs-core/tests/test_rss10.rs

Python Bindings

• crates/feedparser-rs-py/src/types/syndication.rs
• crates/feedparser-rs-py/tests/test_syndication.py

Node.js Bindings

• crates/feedparser-rs-node/__test__/syndication.spec.mjs

Review Results

Review	Status	Grade
Performance	✅ APPROVED	Optimized after fixes
Security	✅ APPROVED	Low risk (98/100)
Testing	✅ APPROVED	B+ → A- after edge cases
Code Review	✅ APPROVED	A-

Test Plan

• Core: 510+ tests passing
• Python: 9 syndication tests passing
• Node.js: 8 syndication tests passing
• Clippy clean (no warnings)
• Edge cases: invalid input, case-insensitivity, partial data
• Bozo pattern compliance verified

[codecov-commenter]

Codecov Report

❌ Patch coverage is 99.40828% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...es/feedparser-rs-core/src/namespace/syndication.rs	99.08%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   91.08%   91.55%   +0.46%     
==========================================
  Files          32       33       +1     
  Lines        6447     6616     +169     
==========================================
+ Hits         5872     6057     +185     
+ Misses        575      559      -16     

Flag	Coverage Δ
rust-core	91.55% <99.40%> (+0.46%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
crates/feedparser-rs-core/src/lib.rs	20.95% <ø> (ø)
crates/feedparser-rs-core/src/namespace/mod.rs	100.00% <100.00%> (ø)
crates/feedparser-rs-core/src/parser/common.rs	77.33% <100.00%> (+0.30%)	⬆️
crates/feedparser-rs-core/src/parser/rss10.rs	94.27% <100.00%> (+3.70%)	⬆️
crates/feedparser-rs-core/src/types/feed.rs	96.36% <ø> (ø)
...es/feedparser-rs-core/src/namespace/syndication.rs	99.08% <99.08%> (ø)

... and 3 files with indirect coverage changes

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[Copilot]

Pull request overview

This PR adds comprehensive support for the RSS 1.0 Syndication Module namespace, including update schedule metadata (updatePeriod, updateFrequency, updateBase), enhances RSS 2.0 xml:lang support, adds Creative Commons license field support across all formats, and provides extensive test coverage with 12+ integration tests for RSS 1.0 parsing.

Key Changes

• Syndication Module Implementation: New namespace/syndication.rs module with UpdatePeriod enum, SyndicationMeta struct, and parsing handlers for RSS 1.0 update schedule metadata
• Parser Enhancements: Added syndication and content namespace support to RSS 1.0 parser, xml:lang attribute propagation in RSS 2.0, and license field extraction in RSS 2.0/Atom
• Cross-Language Bindings: Exposed syndication metadata and license fields in both Python (PyO3) and Node.js (napi-rs) bindings with proper type conversions
• Comprehensive Testing: Added 12 integration tests for RSS 1.0 (basic parsing, Dublin Core, content:encoded, syndication, edge cases) plus binding-specific tests

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/feedparser-rs-core/src/namespace/syndication.rs	New syndication module with UpdatePeriod enum, parsing logic, and comprehensive unit tests
crates/feedparser-rs-core/src/parser/rss10.rs	Integrated syndication and content namespace handlers into RSS 1.0 parser
crates/feedparser-rs-core/src/parser/rss.rs	Added xml:lang attribute extraction and license field support for RSS 2.0
crates/feedparser-rs-core/src/parser/atom.rs	Added license link relation extraction for Atom feeds
crates/feedparser-rs-core/src/parser/common.rs	Added is_syn_tag() and extract_xml_lang() helper functions
crates/feedparser-rs-core/src/types/feed.rs	Added license and syndication fields to FeedMeta
crates/feedparser-rs-core/src/types/entry.rs	Added license field to Entry
crates/feedparser-rs-core/tests/test_rss10.rs	Comprehensive RSS 1.0 integration tests (520 lines, 12 test cases)
crates/feedparser-rs-py/src/types/syndication.rs	Python bindings for SyndicationMeta with proper getter methods
crates/feedparser-rs-py/src/types/feed_meta.rs	Exposed syndication, license, and Dublin Core fields to Python
crates/feedparser-rs-py/tests/test_syndication.py	Python binding tests for syndication namespace (9 test cases)
crates/feedparser-rs-node/src/lib.rs	Node.js bindings with SyndicationMeta interface and type conversions (with Vec pre-allocation removed)
crates/feedparser-rs-node/index.d.ts	TypeScript definitions for syndication metadata and license fields
crates/feedparser-rs-node/__test__/syndication.spec.mjs	Node.js binding tests for syndication namespace (9 test cases)