NS3 slice: Add SSH render responsiveness guardrails #22
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OBJECTIVE: Add cheap render/update diagnostics and regression tests for narrow terminal redraw behavior.
AUTHORITY: Parent #3
NS3: Narrow terminal UI and panel grammar; PRODUCT.md; REQUIREMENTS.md (PRODUCT.md; req: ui/001-002; req: session/003).AGENT AUTHORITY:
PARENT: #3 via explicit issue link and parent checklist.
SCOPE: The smallest source/docs/tests needed to make this behavior real and verified.
BOUNDARIES: No hosted reporting or elaborate benchmark suite.
ACCEPTANCE: A smoke test over representative buffers stays within documented bounds or emits actionable diagnostics.
VERIFICATION: Run the cheapest command that proves acceptance. Include regular tests for the intended payoff and adversarial tests for realistic failure, boundary, or regression cases. If no implementation test command exists yet, create/record the canonical command in AGENTS.md as part of the slice.
BLOCKERS: none
GOAL: Implement this vertical slice to the ACCEPTANCE above, keep the repo clean, cite relevant
req:anchors in code/tests where applicable, and close only after verification passes.Implemented in commit
fddfd1a5e4(Add render diagnostics guardrails).Verification:
Regular tests: render diagnostics report OK for representative narrow editor and list-panel frames, including line count, frame bytes, max line width, and clipped source count.
Adversarial tests: long editor lines and long panel/list rows are clipped to viewport width and produce actionable
render warning: clipped ...diagnostics instead of overflow or silent stalls.Boundary: deterministic local render diagnostics/guardrails only. No telemetry, hosted reporting, broad benchmark suite, concrete panel surfaces, or performance tuning subsystem added.