Reset the tool-less narration count on tool-using turns

[TheGreatAxios]

Summary

• Tool-using turns reset the tool-less narration cycle count to zero, so the incomplete-report spiral measures consecutive tool-less narration turns
• A narrate-then-tools-then-near-miss sequence nudges for the report envelope instead of salvaging as incomplete-report

Verification

• bun test src/subagent/nudge-director.test.ts passes (37 pass, 0 fail)
• bun test ./src/subagent ./tests passes (1435 pass, 0 fail)
• bun run check passes (7132 pass, 0 fail; lint, typecheck, build clean)

Fixes CL-7788

[linear-code]

CL-7788

[TheGreatAxios]

Audit: Approve. One-line reset of toolLessNarrationCycles on tool-using turns, scoped to CL-7788, with a regression test interleaving tool turns between narration-only turns to pin the consecutive (not cumulative) counting intent. No scope beyond the counter fix.