Delete @deepseek-ai/dsh-invariants, every package's ./invariant companion
and its tests, the invariant gates and Vitest setup, the scoped-event
resolver generator, and the INVARIANT-coded listener rethrow paths.
Update docs, READMEs, Agent Notes, and add an upgrade guide.
Review threads: shrink READ_LANG_BY_EXTENSION to the suffixes whose own name is the better label (tsx/jsx/tf/tfvars/gradle) since the other 41 values already equal the language short name; label .hcl as hcl and .tfvars as tfvars instead of tf; accept .groovy alongside .gradle with its own short name; document that LANG_ALIASES also carries the persisted short ids; route the three inline alias lookups through grammarForHint; state that a short name may equal the grammar id; fix the util README wording.
Tests: cover .groovy, the four self-naming suffixes, and every id each suffix reaches through the shipped surfaces (the hand-synced LAZY_ALIASES list could not catch an alias whose target is neither boot nor lazy).
The Summary narrated the change ("the suffixes the old read table recognized keep their historical value") rather than the contract, and at 109 words it exceeded the 100-word package Summary limit.
State the rule a reader at HEAD can act on: a suffix a recorded session already holds keeps its persisted value, every other suffix takes its language's short name. The dropped path-separator and leading-dot detail stays documented under Language selection. Both languages updated and the pairing record re-recorded.
The shared code-language table must not claim a suffix a dedicated viewer
declares, and the Host read card must keep the `lang` values it already
persisted.
- Drop `csv` from the shared table: Code registers before Spreadsheet, so
the earlier body would take `.csv` and the browser snapshot gate fails.
- Add `readLangHintForPath`, the read card's legacy projection over the
shared table: the 43 pre-unification suffixes keep their old short ids
byte for byte, new suffixes use the canonical id.
- Add an ownership regression test over the full preview registry that
turns red when `csv` returns, plus byte-level and alias-normalized tests
for the read projection.
The document Code preview and the Host read card each owned an
extension-to-language table that had drifted: the preview table had 13
extensions the read card lacked, and the two returned different language
ids for the same suffix. Both now resolve through the new zero-dependency
@deepseek-ai/dsh-util-code-language, which also adds common Windows,
config, markup, and language extensions. Every added grammar stays in the
lazy set; the boot grammars are unchanged.
Fixes#4822
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