eliminate redundant disk reads in pagesave effects

[perber]

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[Copilot]

Pull request overview

This PR reduces redundant page disk reads during page-save side effects by propagating raw markdown (including frontmatter) through the page model and consuming it directly in indexing effects.

Changes:

• Add RawContent to tree.Page and populate it in TreeService.GetPage / GetPages via a new NodeStore.ReadPageAndRaw helper.
• Update tags/properties/search side effects to use page.RawContent instead of re-reading raw content from disk.
• Add focused tests for tags/properties side effects and for RawContent behavior (including JSON exclusion).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/wiki/wiki.go	Updates orchestrator wiring for tags/properties effects after constructor signature change.
internal/wiki/import_adapter.go	Keeps import orchestrator wiring in sync with updated effect constructors.
internal/wiki/pagesave/tags_effect.go	Removes redundant raw re-read and indexes tags from Page.RawContent.
internal/wiki/pagesave/tags_effect_test.go	Adds coverage ensuring tags are indexed/updated/removed using raw content.
internal/wiki/pagesave/search_effect.go	Switches bootstrap + incremental indexing to use Page.RawContent.
internal/wiki/pagesave/properties_effect.go	Removes redundant raw re-read and extracts properties from Page.RawContent.
internal/wiki/pagesave/properties_effect_test.go	Adds coverage ensuring properties are indexed/updated/removed using raw content.
internal/wiki/pagesave/effects_test.go	Adds constructor tests ensuring tags/properties effects default the logger.
internal/core/tree/tree_service.go	Populates both stripped Content and RawContent in GetPage(s).
internal/core/tree/tree_service_test.go	Adds tests validating RawContent presence and JSON exclusion.
internal/core/tree/page.go	Extends Page with RawContent (excluded from JSON).
internal/core/tree/node_store.go	Introduces ReadPageAndRaw to derive stripped content from already-loaded raw content.

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