Delete node-gyp debris and strip addons when bottling

[MikeMcQuaid]

• node-gyp compiles native addons inside the keg at install time and
  leaves obj.target trees, *.o objects, *.d dependency files and
  intermediate *.a archives behind under node_modules; they embed
  build paths that pin about 33 npm formulae's bottles and are never
  needed at run time (addons load the linked .node files, not the
  objects they were linked from).
• brew bottle now deletes them alongside *.pyc files, scoped to
  node_modules trees (*.a further to node-gyp build trees) so
  legitimate shipped objects and archives are untouched.
• The linked .node addons themselves embed keg build paths in their
  N_OSO/N_SO stab strings, so brew bottle also runs
  strip -S -o on them, replacing each addon only when strip
  succeeds. Verified on hsd's published leveldown.node: 76 keg
  paths before, 0 after, with the signature still valid because Apple
  strip re-signs ad hoc, so no separate codesign step is needed.

This change is part of plans/relocatable-bottles.md

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• I did not use AI/LLM to create this PR, or I disclosed the tool/model below and reviewed its output; I did not attribute commits to AI and will answer maintainer questions and review comments myself without AI/LLM.

Claude Fable 5 with local review and testing.

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[Copilot]

Pull request overview

This pull request improves bottle relocatability for npm-installed formulae by removing node-gyp intermediate build artifacts from bottled kegs and stripping debug information from compiled .node addons so embedded build paths don’t pin bottles.

Changes:

• Add Keg#delete_node_gyp_debris! to remove node-gyp intermediate obj.target trees and related .o, .d, and build-tree .a files under node_modules.
• Add Keg#strip_node_gyp_addons! to run strip -S on .node addons under node_modules, replacing the addon only when stripping succeeds.
• Invoke both new cleanup steps during brew bottle, and add RSpec coverage for the new Keg behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Library/Homebrew/keg.rb	Implements node-gyp debris deletion and .node addon stripping helpers on Keg.
Library/Homebrew/dev-cmd/bottle.rb	Runs the new keg cleanup steps as part of the bottling flow.
Library/Homebrew/test/keg_spec.rb	Adds tests validating debris cleanup and conditional addon replacement on strip success/failure.
Library/Homebrew/plans/relocatable-bottles.md	Removes the plan item now implemented by this PR.

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