docs: document resolver hooks and their pipeline workflow

[alexander-akait]

Summary

• Adds a new Hooks subsection to the README, covering the four lifecycle hooks on resolver.hooks (resolveStep, noResolve, resolve, result) and every pipeline hook in the order the default pipeline visits them.
• Explains ensureHook / getHook semantics, the AsyncSeriesBailHook callback contract (callback() / callback(err) / callback(null, request)), and the before- / after- stage modifiers used inside ResolverFactory.
• Adds three short, runnable examples: tracing every step via the lifecycle hooks, short-circuiting at the file hook, and a cross-link to the existing MyLibSrcPlugin doResolve walkthrough.
• Updates the final "Tips for writing your own plugin" bullet to point readers at the new section instead of restating a partial hook list.

The hook list and ordering were derived from lib/ResolverFactory.js (the //// pipeline //// section) and the KnownHooks typedef in lib/Resolver.js.

Test plan

• Skim the new Hooks section in the rendered README to check table alignment and anchors.
• Verify the three code snippets compile against the public API (resolver.hooks.resolveStep.tap, resolver.getHook("file").tapAsync, callback(null, request) short-circuit shape).
• Confirm the cross-link from the Custom Plugin tips to #hooks resolves.

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Latest commit: 78ea2d8

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[linux-foundation-easycla]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.46%. Comparing base (a5d029b) to head (78ea2d8).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

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  Files          50       50           
  Lines        2687     2687           
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[codspeed-hq]

Merging this PR will not alter performance

✅ 67 untouched benchmarks

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_{Comparing claude/document-hook-workflow-fixes-gbkwo (78ea2d8) with main (c1437c3)}