Update README.md, docs/reference/index.html, and docs/guide/index.html with documentation for:

• parsec create (feat: parsec create — create ticket and worktree in one step #72)
• parsec new-issue (feat: parsec new-issue for creating tracker issues from CLI #121)
• parsec release (feat: add parsec release command for automated release workflow #114)
• pre_ship hooks in ship (pre_ship hooks support #68)
• [hooks] pre_ship config section
• [release] config section

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