Harden parsing, coverage, and plugin lifecycle

[krotname]

What changed

• Tightened CSV/TSV parsing: tab-priority detection, strict quoted-field termination, explicit empty records, stable pipe escaping, and whitespace normalization.
• Tightened Markdown table detection so Setext headings and mismatched separator columns are not rewritten.
• Preserved Unicode grapheme clusters while wrapping and replaced per-character width balancing with an equivalent batched algorithm.
• Replaced raw GWLP_WNDPROC hooks with SetWindowSubclass and moved cleanup out of DllMain.
• Bounded compatibility-smoke deletion to real child directories without reparse points, with regression tests.
• Fixed native coverage collection with /PROFILE and static instrumentation; empty 0/0 reports now fail instead of reporting 100%.
• Hardened workflows with fixed runners, timeouts, concurrency, artifact checks, validation-before-commit, and a non-release tag namespace for interface syncs.

Root causes and impact

Several parsers accepted malformed or ambiguous input, the old width allocator was proportional to cell width, and the raw window-proc chain could retain a callback into an unloaded DLL. The coverage command filtered by a source path even though the tool's file filter targets instrumented modules, so an empty report passed the threshold. The sync workflow also committed before validation and generated v* tags that could trigger an unrelated failing production release.

Validation

• Win32, x64, and ARM64 Release DLL builds.
• x64 package and Plugin Admin ZIP validation for version 11.0.2.
• Scenario tests: 63 checks; shared Java/C++ golden tests: 74 checks.
• Native line coverage: 1497/1632 lines (91.73%; minimum 70%).
• ASan CoreSmoke run.
• Performance gates, including a 1,000,000-character header at 60 ms (limit 1500 ms).
• 100,000 randomized old/new width-allocation parity cases.
• Plugin shortcut tests and compatibility-script path-safety tests.
• Workflow policy, YAML/XML/JSON, embedded Bash, PowerShell syntax, secret scan, and git diff --check.

Static native coverage follows the Microsoft C++ coverage guidance.

[codecov]

Codecov Report

❌ Patch coverage is 97.52066% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/MarkdownTableCore.cpp	97.52%	3 Missing ⚠️

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