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Error Taxonomy Rollout

This checklist tracks framework-only rollout of canonical error semantics.

Canonical codes​

  • misconfig.pipeline_shape
  • misconfig.caps
  • misconfig.input_shape
  • build.parse_launch
  • runtime.pull
  • io.parse
  • io.open

Execution slices​

  1. Taxonomy scaffolding
  2. Build/validate coding
  3. Runtime pull coding
  4. Session IO parser/open coding
  5. Tests + docs

Verification checklist​

  • SessionError.report().error_code is non-empty on terminal framework failures.
  • PullError.code is populated on runtime pull errors.
  • Session wrapper errors include code + context + hint (no generic fallback text).
  • JSON parse failures include offset= and near='...'.
  • Negative tests assert code + stable message fragments per taxonomy class.
  • Diagnostics docs and architecture docs include triage flow: read error_code, inspect repro_note, inspect bus diagnostics, then replay with repro_gst_launch.