Release 0.5.3

[k3mpaxl]

Version bump to 0.5.3 (app, MCP server, web package, multi-arch publish script, README).

Since 0.5.2:

• Import dialog with saved formats (#4):
  • columns mapped once and saved as a format
  • exports with the same columns recognised automatically, also when dropped
  • columns whose values are known on the board (e.g. Entra object IDs) suggested as those entities
  • live preview
• Board token (#5):
  • agents get the board from the token and are never asked for a board ID
  • "session token" is now "board token"
  • agent changes are recorded as "MCP (analyst)" / "REST (analyst)"
• Notifications recognise Enricher (formerly GTIEnricher).

After merging, the tag v0.5.3 on the merge commit publishes k3mpaxl/factgraph:0.5.3 and latest.

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