WS1: skill auto-mode selection + alias/auto-detect gaps

[kcenon]

What

WS1 — Make high-traffic skills stop rubber-stamping deterministic decisions and fill invocation gaps.

Part of the input-reduction epic.

Why

Every single-item invocation of the lifecycle skills fires an AskUserQuestion to pick solo vs. team execution — but the recommendation is already computed deterministically from size labels / commit counts / failure counts, and --solo/--team overrides already exist. The user is confirming a machine choice with no new information. Similar gaps: sonar-fix needs a PR number that ci-fix already auto-detects; memory-review is missing from the alias table; CI-timeout asks a question precisely when the user has likely walked away.

Where

• global/skills/_internal/issue-work/SKILL.md (mode select ~:214; CI timeout ~:463-466)
• global/skills/_internal/pr-work/SKILL.md (mode select ~:283)
• global/skills/_internal/release/SKILL.md (mode select ~:157)
• global/skills/_internal/doc-review/SKILL.md (mode select ~:127)
• global/skills/_internal/implement-all-levels/SKILL.md (mode select ~:53)
• global/skills/_internal/sonar-fix/SKILL.md (require <pr-number>)
• global/CLAUDE.md (alias table — memory-review row missing)

How

1. Auto-mode: when the mode signals are unambiguous (single-direction, e.g. size/XS → solo), apply the recommended mode silently and print a one-line notice: [Mode: solo — XS issue; pass --team to override]. Fire AskUserQuestion ONLY when signals genuinely conflict. --solo/--team keep working.
2. sonar-fix auto-detect: if no PR number is given, resolve via gh pr list --head "$(git branch --show-current)" --json number -q '.[0].number' (mirror ci-fix).
3. memory-review alias: add a row to the Skill Aliases table in global/CLAUDE.md.
4. CI timeout default: on the 10-minute polling limit, default to "leave PR open" + print the resume command (pr-work <PR>); ask only with an explicit --wait-on-timeout opt-in.

Acceptance criteria

• Unambiguous mode signals proceed with zero prompts; one-line notice printed.
• Ambiguous/conflicting signals still ask.
• sonar-fix resolves PR from current branch when arg omitted.
• memory-review appears in the alias table.
• CI timeout leaves PR open + prints resume command by default.
• No change to the --solo/--team override semantics.

Labels: type/feature, size/S

Part of #743

[kcenon]

Done in PR #749 (squash-merged into develop, commit fcc633b).