task-observer: docs/ai/writing-docs updates from 2026-05-01

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Target\nglobal-doc: docs/ai/writing-docs.md\n\n## Observations addressed\n- Observation 2 (dotfiles/log.md): Rationale is part of the instruction for judgment-heavy rules → changed: added bullet to Contract section — when editing/compressing instructions, preserve short rationale for judgment-heavy rules (where model must choose how to frame output, not execute a mechanical command)\n- Observation 3 (dotfiles/log.md): Hard rules need failure-mode rationale alongside the imperative → changed: same bullet — preserve failure-mode context alongside hard rules (what breaks, what thought pattern is a stop signal, what action is allowed instead); stripping either reduces enforcement strength without reducing length

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