fix(kickoff): stop --force-reinitting hook-config.json on every worktree + container start

[dollspace-gay]

Summary

Closes GH#583. The container entrypoint at crosslink/resources/container/entrypoint.sh ran crosslink init --force on every container start, which unconditionally re-templated .crosslink/hook-config.json from the embedded default. That left a ~50-line diff in every agent-produced worktree (top-level keys moving into agent_overrides, new agent_lint_commands/agent_test_commands fields appearing) which leaked into every kickoff PR and required reviewers to remember to git restore .crosslink/hook-config.json before merging.

Scope

Two call sites — the user's issue only named the container entrypoint, but the same bug pattern exists on the host side and the symptom required both to be fixed:

• crosslink/resources/container/entrypoint.sh:131 — container's init call.
• crosslink/src/commands/kickoff/launch.rs::init_worktree_agent — host-side init that runs against the freshly-created worktree before the container starts. The host pass re-templates first, then the container pass re-templates again; dropping --force from only one wouldn't make the diff go away.

Fix

Drop --force from both call sites. Plain crosslink init short-circuits at commands/init/mod.rs:751 when .crosslink/ and .claude/ already exist (the common case for any worktree checked out from a branch that committed both), making the init a deliberate no-op on existing state instead of an unconditional re-template.

Kept --skip-signing and --defaults on the host call because they suppress the TUI walkthrough on the rare path where init genuinely has work to do (one of the dirs missing). Users who want to refresh hooks deliberately still run crosslink init --force manually — the existing documented path.

Test plan

• cargo fmt --check — clean
• cargo clippy --lib --bin crosslink -- -D warnings — clean
• cargo test --bin crosslink kickoff:: — 149/149 pass
• bash -n entrypoint.sh — clean
• Manual: run crosslink kickoff run --container docker ... against a repo that committed .crosslink/ + .claude/, confirm the agent's first git diff no longer shows hook-config.json modified
• Manual: same against a repo with .crosslink/ deliberately gitignored, confirm init still creates it (plain init does the full setup when the dir is absent)

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