feat: linear quorums

[cusma]

This PR updates the quorums (both regular and weighted) from a fixed category-sized quorum to linearized quorums according to the requested amount.

[Copilot]

Pull Request Overview

This PR implements linear quorum thresholds for proposals based on the requested amount, replacing the previous fixed category-based quorum system. The quorum now scales linearly from minimum to maximum values according to the formula: Q(A) = Q_min + ΔQ × (A - A_min) / ΔA.

Key changes include:

• Implementation of linear quorum calculation functions in both test code and smart contracts
• Removal of medium quorum configuration values (now unused as quorums are computed dynamically)
• Updated documentation to reflect the new linear quorum specification
• Modified environment templates and CI/CD configurations to set medium quorum to 0

Reviewed Changes

Copilot reviewed 12 out of 23 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/proposal/common.py	Added compute_quorum_threshold and compute_weighted_quorum_threshold functions to calculate linear quorums based on requested amount
smart_contracts/proposal/contract.py	Removed old category-based quorum lookup functions; implemented new linear quorum computation in compute_quorum_threshold and compute_weighted_quorum_threshold
smart_contracts/xgov_registry/contract.py	Marked medium quorum fields as "No longer used" and set them to 0 in configuration
smart_contracts/xgov_registry_mock/contract.py	Removed set_quorum_medium and set_weighted_quorum_medium methods
smart_contracts/xgov_registry/config.py	Set QUORUM_MEDIUM and WEIGHTED_QUORUM_MEDIUM to 0 with deprecation comments
docs/specs/proposal.md	Updated specification to document the linear quorum formula
docs/specs/proposal-vote.md	Removed "category-dependent" language from quorum descriptions
docs/implementation/configuration.md	Updated configuration table to show Min/Max quorum values instead of Small/Medium/Large
tests/xgov_registry/conftest.py	Grouped transactions using new_group() and send() for better transaction management
.env.localnet.template	Updated medium quorum values to 0 in configuration
.github/workflows/xgov-beta-sc-cd.yml	Updated CI/CD configuration to use 0 for medium quorum values
Compiled TEAL artifacts	Reflect the contract changes with updated bytecode

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