SPDD 2026-05-24: Strengthen MCP Scripts norms, expand ET sync notes, add forecast/fuzzy-schedule tests

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Five spec files reviewed in the daily SPDD rotation had weak safeguard norms, missing file mappings, and untested edge cases. This addresses all P0–P2 items from the plan.

Spec strengthening

• MCP Scripts §7.2 — JavaScript tools SHOULD provide → MUST provide for V8 sandbox isolation; adds normative SM-JS-01 requiring sandboxed V8 context with restricted global scope
• MCP Scripts §7.3 — input length limit SHOULD be at least 10KB → SM-IS-01 (MUST enforce a maximum input string length of at least 10KB; reject oversized inputs, never truncate silently)
• Effective Tokens §9 — adds three normative MUST NOT constraints: ET-EXT-01 (no weight redefinition without version bump), ET-EXT-02 (no new mandatory schema fields without conformance revision), ET-EXT-03 (no reserved token class name reuse)
• Effective Tokens Sync Notes — adds §4–§8 implementation file-mapping table (effective_tokens.go, logs_models.go, logs_episode.go, audit_report.go, token_usage.go, etc.) and a sync procedure checklist
• Forecast §13 — marks fixture-test TODO resolved, converts remaining inline bullets to tracked issue references (Close SPDD gaps for forecast discovery, frontmatter hash limits, and related specs #31984, Add patterns router prompt and wire dispatcher routing #31985)

Bug fix

runMonteCarlo did not guard against non-finite λ — NaN caused an infinite loop in Knuth's Poisson algorithm (p <= NaN is always false), and +Inf produced integer overflow:

// Before
if n == 0 || observedRunsPerPeriod <= 0 {

// After
if n == 0 || observedRunsPerPeriod <= 0 || math.IsNaN(observedRunsPerPeriod) || math.IsInf(observedRunsPerPeriod, 0) {

New tests

• TestRunMonteCarloNonFiniteLambda — table-driven: NaN, +Inf, -Inf all return nil without hanging
• TestRunMonteCarloZeroLambdaFallback — table-driven: zero/negative/empty/positive λ cases covering R-MC-001
• TestFuzzyScheduleEndToEnd — exercises FUZZY:DAILY, FUZZY:DAILY_WEEKDAYS, FUZZY:DAILY_AROUND:14:0 through the full pipeline: parser.ScatterSchedule → parseCronSchedule → buildScheduleGrid → displayScheduleCalendar
• TestObservedRunsPerPeriodConsistency — asserts ForecastWorkflowResult.ObservedRunsPerPeriod (JSON field / λ) is identical to the value passed to runMonteCarlo, codifying R-MC-002

[Copilot]

Pull request overview

This PR tightens several specification “MUST/MUST NOT” norms (MCP Scripts + Effective Tokens), updates Forecast sync notes, fixes a Monte Carlo edge case in the forecast implementation (non-finite λ), and adds tests for forecast Monte Carlo and fuzzy schedule end-to-end behavior. It also updates a generated workflow lockfile.

Changes:

• Guard runMonteCarlo against NaN/±Inf λ to prevent hangs/overflow, and add targeted Monte Carlo tests.
• Add/extend CLI tests to cover fuzzy schedule scattering through the schedule calendar pipeline.
• Strengthen/expand specs: MCP Scripts isolation + input-size norms, Effective Tokens extension constraints + implementation mapping table, and Forecast sync follow-ups.

Show a summary per file

File	Description
pkg/cli/forecast_test.go	Adds a new λ consistency test for forecast output/MC integration (currently needs formatting + stronger linkage to production path).
pkg/cli/forecast_montecarlo.go	Adds NaN/Inf guard to Monte Carlo λ handling.
pkg/cli/forecast_montecarlo_test.go	Adds tests for non-finite and zero/degenerate λ behavior.
pkg/cli/compile_schedule_calendar_test.go	Adds an end-to-end fuzzy schedule → calendar pipeline test (currently needs gofmt + minor doc/assertion alignment).
docs/src/content/docs/reference/mcp-scripts-specification.md	Strengthens JavaScript sandboxing and string input length requirements with new normative IDs.
docs/src/content/docs/reference/forecast-specification.md	Marks some follow-ups resolved and links remaining items to tracking issues.
docs/src/content/docs/reference/effective-tokens-specification.md	Adds ET extension “MUST NOT” constraints and a spec→implementation mapping + sync checklist.
.github/workflows/daily-malicious-code-scan.lock.yml	Regenerates the lock workflow with updated setup/actions and metadata.

Copilot's findings

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Comments suppressed due to low confidence (4)

pkg/cli/forecast_test.go:132

• The new test body isn’t gofmt-formatted (missing indentation inside the function). This makes the file inconsistent with the rest of the Go codebase and may fail formatting checks if CI enforces gofmt. Please run gofmt on this file (or reindent the block).

func TestObservedRunsPerPeriodConsistency(t *testing.T) {
// Reproduce the λ calculation from forecastWorkflow.
const (
historyDays   = 30
sampledRuns   = 15

pkg/cli/forecast_test.go:163

• The assertion here compares result.ObservedRunsPerPeriod to observedRunsPerPeriod, but both values are set from the same local calculation in this test. This doesn’t verify that the real forecastWorkflow pipeline uses the same λ for JSON output and Monte Carlo execution. If the goal is to lock R-MC-002 down, the test needs to observe λ coming from the production computation path (or explicitly validate the runMonteCarlo call site in forecastWorkflow).

// runMonteCarlo uses result.ObservedRunsPerPeriod as λ — the same field that
// appears in JSON output. Verify both the field value and the simulation are
// consistent (non-nil, same λ).
rng := rand.New(rand.NewSource(99)) //nolint:gosec
mc := runMonteCarlo(etObs, successCount, result.ObservedRunsPerPeriod, rng)
require.NotNil(t, mc, "runMonteCarlo must return non-nil for positive ObservedRunsPerPeriod")

// The field exposed in JSON output must equal what was used for MC.
assert.Equal(t, observedRunsPerPeriod, result.ObservedRunsPerPeriod,
"ObservedRunsPerPeriod JSON field must equal the λ passed to runMonteCarlo")

pkg/cli/compile_schedule_calendar_test.go:328

• The new end-to-end test block isn’t gofmt-formatted (missing indentation throughout the function). Please run gofmt on this file so the formatting is consistent with the rest of the Go codebase and to avoid potential formatting-check failures.

func TestFuzzyScheduleEndToEnd(t *testing.T) {
fuzzyExpressions := []struct {
fuzzyCron      string
workflowID     string
expectedHours  int // how many distinct hour values we expect (1 for DAILY patterns)
}{
{"FUZZY:DAILY * * *", "ci-doctor", 1},
{"FUZZY:DAILY_WEEKDAYS * * *", "daily-planner", 1},
{"FUZZY:DAILY_AROUND:14:0 * * *", "weekly-audit", 1},
}

pkg/cli/compile_schedule_calendar_test.go:374

• This test redirects os.Stderr via os.Pipe(), but it never closes the read end (r). Please ensure both ends of the pipe are closed (e.g., defer r.Close() after creation) to avoid leaking file descriptors across the test suite.

// Step 4: displayScheduleCalendar should produce output referencing the hour.
oldStderr := os.Stderr
r, w, pipeErr := os.Pipe()
require.NoError(t, pipeErr)
os.Stderr = w

• Files reviewed: 8/8 changed files
• Comments generated: 4